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Specification for Cements and Materials for Well Cementing 1-D seismic data 1D seismic data 2-way traveltime 2D seismic data	2D survey 3C seismic data 3D seismic data 3D survey 4C seismic data	4D seismic data 6FF40 a API Recommended Practice 10B Recommended Practice for Testing Well Cements API Specification 10A &ndash
A
abandonment costs abnormal events abnormal pressure abrasion test abrasive jetting absolute age absolute filter absolute open flow potential absolute permeability absolute pressure absolute volume absorbing boundary conditions absorptance absorption absorption band absorption oil abyss abyssal accelerator accelerator source accelerometer accommodation accretion accumulation accumulator accuracy acetic acid acid acid effect acid frac acid gas acid inhibitor acid job acid stimulation acid tank acid wash acidity acidize acidizing acoustic acoustic basement acoustic coupler acoustic emission acoustic impedance acoustic impedance section acoustic log acoustic mode acoustic positioning acoustic transducer acoustic transparency acoustic traveltime acoustic velocity acoustic velocity log acoustic wave acquisition acquisition log acrylamide acrylate polymer acrylamide polymer acrylamide-acrylate polymer acrylamido methyl propane sulfonate polymer acrylamido-methyl-propane sulfonate polymer acrylate polymer activation log active margin active sulfide activity of aqueous solutions acyclic compound additivity adjacent bed adjustable choke adjusted flow time adsorbed gas adsorption advective transport modeling aeolian aeolotropy aerated layer aerobic	aeromagnetic survey AFE afterflow AGC AGC time constant agglomeration aggradation aggradational aggregate aggregation air cut mud air drill air drilling air gun air shooting air wave air-cut mud Alford rotation alias filter aliasing alidade aliphatic compound alkaline alkaline flooding alkalinity alkalinity test allochthon allochthonous allogenic alluvial alluvium alpha processing altered zone alum aluminum activation log aluminum stearate ambient temperature amides amines Amott imbibition test amplitude amplitude anomaly amplitude distortion amplitude variation with offset AMPS anaerobic analog angle of approach angle of incidence angular dispersion angular unconformity anhydrite aniline point test anion anionic anisotropic anisotropic formation anisotropy annubar annular blowout preventer annular BOP annular flow annular gas flow annular pressure annular production annular space annular velocity annuli annulus anode anomalous anomaly anoxic antialias filter anticlinal anticlinal trap anticline antifoam	antifoam agent antisqueeze antithetic fault antiwhirl bit AOF AOFP aperture API API cement API fluid loss test API fluid-loss test API gravity API unit API water apparent anisotropy apparent dip apparent matrix apparent velocity apparent viscosity apparent wavelength applied-potential method appraisal aquifer Archie equation Archie rock area open to flow arenaceous argillaceous arithmetic mean armor aromatic content test aromatic hydrocarbon array array induction array laterolog array propagation resistivity array sonic arrival arrival time artificial intelligence artificial lift as delivered BTU as-delivered BTU asphalt asphaltenes asphaltic crude asphaltic mud additive assignment asthenosphere ASTM atmospheric corrosion attapulgite attenuate attenuation attenuation resistivity attitude attribute audio measurement aulacogen authigenic authochthon authority for expenditure autochthonous autocorrelation automatic gain control autotrack autotracking AV average reservoir pressure average velocity AVO axial loading axial surface azimuth azimuthal azimuthal density azimuthal laterolog azimuthal resolution
B
back flow back in back off back pressure back pressure valve back propagation back stripping back up back up ring back wash back-in back-pressure back-pressure valve back-propagation back-stripping back-up ring backflow background gas backoff backpressure backscatter backside backup curve backwash bactericide bad hole balance point balanced activity oil mud balanced array balanced plug balanced-activity oil mud ball catcher ball diverter ball dropper ball operated ball out ball sealer ball-operated ballout band band limited function band pass band reject band-limited function band-pass band-reject bank firing barefoot barefoot completion barite barite plug barrel equivalent barrel pump barrels of liquid per day barrels of oil per day barrels of water per day baryte base exchange base log base map base of weathering base slurry base station baseline basement basic wavelet basin basket basket flowmeter basket sub batch mixer batch treatment bathyal battery battery site Bayesian inference Bayesian method Bayesian probability BBL or bbl Bc Bcf Bcf/D bead tracer beam beam pump bean bean choke Bearden units of consistency Beaufort scale bed bed thickness bed wrap bedrock bel bell nipple belt effect benchmark beneficiate beneficiation Benioff zone benthic	benthos bentonite bentonite equivalent BGG BHA BHCT BHP BHST BHT bias bias weld bicarb bicarbonate bicenter bit bichromate salt bid and study agreement big hole charge big-hole charge bilinear flow billion cubic feet billion cubic feet per day bimetallic corrosion bimetallism bin Bingham plastic model bioaccumulation bioassay biochemical oxygen demand biocide bioconcentration biodegradation biopolymer biostratigraphic biostratigraphy Biot theory biphasic bird birefringence bit bit box bit breaker bit nozzle bit record bit resistivity bit trip bitumen bivariate analysis black list Blaine fineness bland coring fluid blank pipe blanket gas blast joint blasting cap bleed off bleedoff line blended crude blender blind box blind ram blind shear ram blind zone blind-shear ram block blockage blow down blow out blow out preventer blowdown blowdy blowing the drip blowout blowout preventer BLPD BM BOD body wave Boltzmann probability distribution bomb bond log bonus consideration Boolean simulation booster BOP BOP stack BOPD borehole borehole compensation borehole correction borehole gravity borehole gravity meter borehole seismic data borehole televiewer Born method bottle test bottom log interval bottom sample bottomhole assembly bottomhole choke bottomhole circulating temperature bottomhole gas separator	bottomhole heater bottomhole injection pressure (bhip) bottomhole pressure bottomhole sampler bottomhole shut in bottomhole shut-in bottomhole static temperature bottomhole temperature bottoms up bottoms up mud sample bottoms-up bottoms-up mud sample Bouguer anomaly Bouguer correction Bouma sequence bound fluid bound water bound-fluid log boundary conditions bounded reservoir bow tie bow-spring centralizer box box plots Boyle's Law Boyle's Law Double Cell Boyle's Law Single Cell brachistochrone braided line brake break break circulation break out breakdown pressure breaker breakout breakout cathead breakout tongs breakthrough bridge bridge off bridge plug bridge-off bridging agent bridging material bridle Briggs color cube bright spot brine bring in the well British thermal unit broach broadside array bromide brine bromocresol green Brookfield viscometer brownfield Brownian motion brute stack BS&W BTU bubble count bubble effect bubble flow bubble point bubblepoint bucking coil bucking current buffer buffer solution buffered mud buffered solution buggy vibro buildup test bulk modulus bulk relaxation bulk volume bull plug bullet perforating bullhead bump the plug bundle buoyancy buoyancy method burn over burn shoe burn-over butt weld butterfly chart button resistivity buttress thread BWOB BWOC BWOW BWPD by weight of blend by weight of cement by weight of water bypass bypass velocity bypassed mud
C
C pump cable cable head cable-tool drilling cake cake consistency cake thickness calcite calcium bromide calcium carbonate calcium carbonate plug calcium chloride calcium contamination calcium hydroxide calcium mud calcium naphthenate calcium oxide calcium sulfate calcium test calibration caliche caliper log camera cap cap rock cap the well capacitance log capacitance meter capillary pressure curve capillary suction time test capillary tube viscometer capillary-suction-time test caprock effect capsule gun carbide lag test carbon density carbon dioxide carbon dioxide corrosion carbonate carbonate gamma ray carbonate ion carbonate scale carbonate test carboxymethyl hydroxyethylcellulose carboxymethyl starch carboxymethyl, hydroxyethylcellulose carboxymethylcellulose carried working interest carrier fluid carrier gun carry over carrying capacity carryover cartridge cased hole casing casing bowl casing burst pressure casing centralizer casing collar casing collar locator (CCL) casing collar log casing completion casing coupling casing grade casing gun casing hanger casing hardware casing head casing inspection log casing joint casing patch casing point casing potential profile casing pressure casing reciprocation casing roller casing scraper casing shoe casing shoe test casing spool casing string casing swage casing test casing thread casing valve casing-inspection log casing-potential profile casinghead cat line cataclasite cataclastic catagenesis cathead cathode cathodic protection cation cation exchange capacity cation-exchange capacity cationic catline catwalk caustic extraction test caustic potash caustic soda cave effect cavings cavitation CDP CEC cellar cellulosic polymer cement cement accelerator cement additive cement bond log cement dispersant cement evaluation log cement extender cement head cement plug cement retainer cement retarder cement squeeze cementation cementation exponent cementer cementing cementing engineer cementing plug centipoise centralizer centrifugal pump centrifuge CERCLA cesium acetate cesium formate chain tongs chalk channel channel wave channeling character charged zone check shot survey check valve check-shot survey chelate chelating agent chelation chelation agent chemical barrel chemical cutter chemical diversion	chemical diverter chemical flooding chemical injection chemical marker injection chemical neutron source chemical oxygen demand chemical wash chemical-marker injection Chenevert Method chert cherty chloride test chlorite choke choke line choke manifold CHOPS Christmas tree chromate salt chrome free chrome lignite chrome lignosulfonate chrome tubing chrome-free chromic salt chronostratigraphic chart chronostratigraphy churn flow CI circle shooting circulate circulate out circulation circulation device circulation loss circulation sub circulation system circulation time circulation valve citric acid classical reservoir modeling clastic sediment clathrate clay clay bound water clay extender clay stabilizer clay swelling clay water interaction clay-bound water clay-water interaction clean clean out cleanout cleanup clear brine clear water drilling clear-water drilling close in close-in closed chamber testing closed in well closed mud system closed-chamber testing closed-in well closing unit closure closure pressure cloud point cloud point glycol cluster cluster analysis CMC CMC-Hi Vis CMC-HVT CMC-Lo Vis CMC-LVT CMHEC CMP CMS CO2 injection coal coalesce coalescence coarse coating coating flaw COD coding COFCAW cogeneration coherence coherence filtering coherence map coherence vector map coherent coherent detection coherent noise coiled tubing coiled tubing completion coiled tubing connector coiled tubing drilling coiled tubing string coiled tubing unit coke cokriging cold heavy oil production with sand cold production collapse pressure collar collar locator collar lock collar log collector collision colloid colloidal colloidal solids colloidal suspension combi BOP combination string come out of the hole commercial rate commingled completion commingled flow common depth point common midpoint common midpoint method common offset common receiver common reflection point common-offset common-receiver communitization compaction compaction correction company man company representative compartment compartmentalization compatibility compatible scales compensated density log compensated neutron log compensated-density log competent complete a well completion completion fluid completion skin complex trace analysis complex-trace analysis composite log composite stream compositional fluid analysis	compressibility compression ratio compression-set packer compressional wave compressor compressor plant Compton scattering computed tomography concentric concentric fold conceptual model concession condensate condensate liquids condensate ratio condensed section conditional simulation conductance conductive invasion conductive rock matrix model conductivity conductometric titration conductor pipe conformable conformity conical projection coning connate water connection connection gas consistency consistometer consolidated consolidation constant rate contact contact angle contact time contaminant contamination gas continental shelf contingency plan continuity equation continuous gas lift continuous phase continuous reservoir contour contour interval contour map contract depth control line controlled time survey convection conventional mud conventional reservoir convergence convergent converted wave conveyance convolution convolve copolymer copper carbonate core core analysis core gamma log core image core plug core testing coring fluid corkscrew hole corrected gamma ray correcting pressure to a datum correlate correlation correlation log correlogram corrosion corrosion control corrosion coupon corrosion fatigue corrosion inhibitor corrosion rate corrosion-resistant alloy (CRA) cost oil counterbalance weight counterbalance winch coupling coupon CPMG cracking craton creaming crest cresting critical angle critical damping critical flow rate critical gas flow rate critical matrix critical moment critical rate critical reflection crooked hole crop out cross dipole cross over cross section cross-sectional crosscorrelate crosscorrelation crosscorrelation flowmeter crossflow crossline crosslinker crossover crossover service tool crossplot crossplot porosity crosswell tomography crown block crown valve crude oil crushed zone crust crystallization temperature CSS CT cubic packing cultural anomaly cultural noise cumulative production curing curve curve fitting curve matching cushion cut cut and thread fishing technique cut oil cut point cut-and-thread fishing technique Cutt point cuttings cuttings lifting CWA cycle condensate cycle gas cycle skip cycle time cyclic steam injection cycling plant cyclothem cylinder
D
damage damaged zone damping darcy Darcy units dart data rate datum datum correction datum level day rate daylight tour dB DD DEA unit dead oil Dean-Stark extraction decibel decollement deconvolution deep induction deep penetrating charge deep seismic sounding deep tow deep-penetrating charge deep-water play deepwater play deflector flowmeter deflocculant deflocculate deflocculated mud deflocculation defoamer defoaming plates degasser degree API dehydrate dehydration dehydrator delay rental deliverability test delta delta rho delta t delta t stretch delta-t stretch deltaic demulsifier densimeter densitometer density density contrast density current density measurement density profile departure curve dephasing depleted zone depletion deployment system depocenter deposit depositional energy depositional environment depositional system depth control depth controller depth conversion depth correlation depth datum depth derived depth map depth mark depth matched depth matching depth migration depth of invasion depth of investigation depth point depth reference depth reference point depth section depth wheel depth-derived derivative logs derrick derrick floor derrickman desander desiccant desilter desulfurize detail log detectable limit detector determinism deterministic deconvolution deterministic methods detonate detonating cord detonator detrital detritus development deviated drilling deviated hole deviation	deviation survey dew point dewatering dewpoint dextral diagenesis diagenetic diagenetic porosity diameter of invasion diameter of investigation diamond bit diapir diatom diatomaceous diatomite dichromate salt dielectric dielectric constant dielectric permittivity dielectric propagation log dielectric resistivity diesel oil mud diesel-oil mud diesel-oil plug difference map differential compaction differential pressure differential pressure sticking differential SP differential spectrum differential sticking differential temperature log differential weathering correction differential-temperature log difficult to disperse difficult to disperse in salt diffraction diffraction stack diffusion diffusion equation diffusion relaxation dike dilatancy dilatancy theory dilatation dilatational wave diluent dilution dilution water dim spot dip dip correction dip fault dip moveout dipole dipping bed direct emulsifier direct hydrocarbon typing direct indicating viscometer direct-indicating viscometer directional driller directional drilling directional permeability directional survey directional variograms directional well directivity dirty disbonding disconformity discontinuity disharmonic dispersant dispersed bubble flow dispersed clay dispersion displacement displacement fluid disposal well dissolved solids distillation extraction distortion distributed temperature log distributed-temperature log distribution diurnal variation divergence diversion diverter diverter flowmeter diverting agent division order Dix formula DMO dog collar dog house dog leg doghouse dogleg dolomite dolomitization dolostone domain domainal fabric domainal structure dome doodlebugger dope	dosing pump double refraction down dip down lap down stream down stroke downdip downhole gauge downhole receiver downhole safety valve (DSV) downhole sensors downhole source downlap downstream downstream pipeline downstroke downward continuation drag bag drag bit drag-bag drain hole drainage drainage area drainage volume drainhole drape draw down drawdown drawdown test drawworks Drdger tube drift drill bit drill collar drill in fluid drill noise vertical seismic profile drill pipe drill ship drill solids drill string drill-in fluid drill-noise vertical seismic profile drillable packer drilled solids driller driller's depth drilling break drilling contractor drilling crew drilling detergent drilling fluid drilling foreman drilling mud drilling procedure drilling program drilling rate drilling rig drilling riser drilling-fluid engineer drillpipe drillpipe conveyed drillship drillstem drillstem test drillstring drip drip accumulator drop ball drop bar drop sub drop-off gun dropoff gun dropout dry bed dry bed dehydrator dry combustion dry forward combustion dry gas dry hole dry oil dry rock dry-bed dehydrator DSS DST DST pressure chart dual completion dual induction dual permeability reservoir dual porosity reservoir dual water dual-permeability reservoir dual-porosity reservoir dummy valve dump bailer duplex pump duster dyke dynamic correction dynamic filter press dynamic filtration dynamic fluid level dynamic positioning dynamic range dynamic-aging test dynamite dynamometer dynamometer card
E
early time transient data early-time transient data earthquake easy to disperse easy to disperse in salt eccentralizer eccentric eccentricity ECD echo spacing EDA eddy current eddy current measurement eddy-current measurement EDTA eel effective laminar flow effective medium theory effective permeability effective porosity effective shot density effective velocity effective water saturation effective wellbore radius eigenvector elastic elastic constants elastic deformation elastic impedance elastic limit elastic moduli elastic neutron scattering elastic wave elasticity electric gas lift valves electric gas-lift valves electric probe electric submersible pump electrical anisotropy electrical conductivity electrical coupon electrical double layer electrical impedance probe electrical log electrical permittivity	electrical resistance probe electrical resistivity electrical stability test electrical survey electrode device electrode resistivity electrodynamic brake electrohygrometer electrokinetic potential electromagnetic caliper electromagnetic method electromagnetic propagation electromagnetic propagation measurement electromagnetic thickness elemental capture spectroscopy elevation correction elevator embedded wavelet embrittlement empirical emulsifier emulsion emulsion flow emulsion mud en echelon encapsulation end point endfire array endless tubing endpoint enhanced diffusion enhanced oil recovery entrained gas entrance hole environmental corrections eolian EOR EPA Epanechnikov kernel epithermal neutron porosity measurement epm equalizing loop equalizing valve equation of state equipotential method	equivalent circulating density equivalent conductance equivalent sack equivalent water resistivity equivalent weight erode erosion erosion corrosion erosion-corrosion error ES test escape line ESP estimated ultimate recovery estuarine estuary Euclidian dimension Euclidian distance eustasy eustatic eustatic sea level evaporation pit evaporite evaporitic evening tour event excavation effect excess cement exit velocity expanding cement expansion joint expectation expendable gun expendable plug expert system exploration exploration play exploratory explosive seismic data extended spread extensive dilatancy anisotropy external cutter external phase external pulling tool external upset
F
f-k domain f-k plot facies facies modeling fairway fall off test falloff test fan shooting Fann viscometer far water farmee farmor farmout fast diffusion fast formation fast formation arrival fast Fourier transform fast neutron reaction fast-formation arrival fast-neutron reaction fatty acid fatty acid soap fatty-acid soap fault fault trap Faye correction FD fee simple interest fee-simple interest feldspar felsic fence diagram Fermat's principle ferro-chrome lignosulfonate ferrous sulfide FFT fiber LCM fiber lost circulation material fiber lost-circulation material field field tape field weld fill cement fill sub film forming amines film-forming amines filter filter cake filter cake quality filter cake thickness filter cell filter loss filter media filter medium filter press filter-cake quality filter-cake thickness filtered brine filters filtrate filtrate slump filtrate tracer filtrate volume filtration filtration test cell filtration tester final flow period final flow rate final flowing pressure final shut in period final shut-in period fine fines fines migration fingerboard fingering finite conductivity fracture finite wellbore solution finite-conductivity fracture finite-wellbore solution fire flooding firing head first arrival first break first reading fish fish eye fishbone wells fishing fishing bell	fishing diagram fishing neck fishing tool fitted model fitted variogram five spot five-spot fixed choke fixed source method fixed-cutter bit fixed-source method flag flag joint flake LCM flake lost circulation material flake lost-circulation material flange flange up flapper valve flare flare gas flash point flat gels flattened section flexural mode float collar float joint float shoe floc flocculant flocculate flocculation flooding surface flow after flow flow after flow tests flow back flow check flow concentrating flow coupling flow efficiency flow line flow loop flow meter flow model flow period flow profile flow regime flow simulation flow stream flow structure flow unit flow-after-flow tests flow-concentrating flowback flower structure flowing neutron log flowing pressure flowing well flowline flowline manifold flowline mud sample flowline sample flowmeter flowstream flowstream sample fluid compatibility test fluid compressibility fluid contact fluid density log fluid flow fluid interface log fluid invasion fluid level fluid loss fluid loss control fluid loss control material fluid pound fluid tester fluid-density log fluid-friction reducer fluid-interface log fluid-loss additive fluid-loss control fluid-loss-control material fluoboric acid fluoroscopy flush joint flush production flushed zone flushed zone water saturation	flushed-zone water saturation fluvial flux leakage fly ash foam breaker foam diversion foam generator foamed cement foaming agent foamy oil fold footprint foreign content formaldehyde formate formation formation damage formation evaluation formation evaluation while drilling formation exposure time formation factor formation fluid formation fracture pressure formation pressure formation water formic acid forward modeling forward problem fossil four component seismic data four dimensional seismic data four-component seismic data four-dimensional seismic data Fourier analysis Fourier synthesis Fourier transform Fourier transform infrared spectroscopy frac ball frac crew frac fluid frac gel frac gradient frac gun frac job frac pump frac valve fractal fractal analysis fractal networks fracture fracture acidizing fracture conductivity fracture gradient fracture half-length fracture networks fracture permeability fracture porosity fractured well analysis fractured-well analysis fracturing fluid fracturing pressure free air correction free fluid free gas free induction decay free point free point indicator free water free water knockout free-air correction free-induction decay free-point indicator free-water knockout frequency frequency domain fresh core fresh water Fresnel zone friction effect friction reducer froth flow FT FTIR full waveform Full-azimuth towed-streamer acquisition fullbore fullbore spinner funnel viscosity FWKO
G
gain Gal galena galvanic anodes gamma ray densitometer gamma ray interactions gamma ray log gamma-gamma log Garrett Gas Train gas anchor gas bearing gas buster gas cap gas cap drive gas chimney gas condensate gas coning gas cut mud gas deviation factor gas drive gas formation volume factor gas gravity gas holdup log gas hydrate gas in solution gas injection gas interference gas lift gas lift mandrel gas lift valve gas liquid ratio gas lock gas migration gas oil contact gas oil ratio gas processing plant gas prone gas sand gas separator gas show gas solubility factor gas water contact gas well gas well deliverability gas-bearing gas-cap drive gas-cut mud gas-holdup log gas-lift mandrel gas-lift valve gas-oil contact gas-oil contact (GOC) gas-prone gas-solubility factor gas-water contact gas-well deliverability gas/liquid ratio gas/oil ratio gasdrive gaswell gas gaswell liquids gate valve gather gathering lines gathering system	gauge hole gauge pressure gauge ring gauge tank Gaussian collocated cosimulation Gaussian techniques gel gel strength gelation gelled mud gelled up mud gelled-up mud gels generation geochemical log geochemistry geochronology geologic geologic map geologic time scale geological geologist geology geomagnetic polarity reversal geomagnetic polarity time scale geomechanics geometric geometrical factor geophone geophone array geophone cable geophone interval geophone offset geophone pattern geophysicist geophysics geopressure geopressure gradient geopressured geostatic pressure geostatistical methods geostatistical modeling geostatistics geosteer geosteering geothermal gradient Geronimo line GGT ghost Gibbs' phenomenon gilsonite gin pole glacial glacier glass jar test glauconite Global Positioning System GLR glycol glycol absorber glycol dehydrator glyph goose neck gooseneck GOR government take	GPS GPTS GR graben gradiomanometer grain density granite granular LCM granular lost circulation material granular lost-circulation material grapple gravel pack gravel pack gun gravel pack log gravel pack screen gravel-pack gun gravel-pack log gravel-pack screen graveyard tour gravimeter gravimetry gravity gravity anomaly gravity drainage gravity segregation gravity survey gravity units gray list grease injection system grease seal grease tube grease-injection system greasing out greedy algorithm green gas green list grey list grid gridding gridding algorithm grind gripper blocks gross production ground roll groundwater group group interval growth fault guar gum guard electrode guard log guide shoe guided wave gumbo gun gun barrel gun clearance gun the pits gun zero gunk gunk plug gunk squeeze gunning the pits gyp mud gypsum
H
H2S haematite halite halo effect hard rock hard water hardground hardness ion harmonic harmonic distortion hatch HBP HCl HE starch head head wave header header box heading heater heater treater heavy metal heavy oil heavy pipe heavyweight drillpipe HEC hectorite held by production hematite Herschel Bulkley fluid Herschel-Bulkley fluid hertz hesitation squeeze heterogeneity heterogeneous formation HF HGS HHP hiatal hiatus hierarchical cluster analysis high explosive high pressure squeeze high shot density gun high temperature completions high-gravity solids high-pressure squeeze high-pressure, high-temperature high-pressure, high-temperature filtration test high-pressure, high-temperature viscometer	high-shot density gun high-specific-gravity solids highstand systems tract history matching HLB number hodogram holdup holdup depth holdup image holdup log holdup map holdup meter hole cleaning hollow carrier gun homogeneity homogeneous homogeneous formation hook hook load hookwall packer hopper horizon horizon slice horizontal drilling horizontal resistivity horizontal separator horizontal severance horizontal tree Horner slope horst hostile environment hot lime hot oiler hot oiling hot tapping hot waterflooding Hough transform housing HP starch HPHT HPHT filtration test HPHT viscometer HSE HUD huff and puff Humble formula humic acid humidity humidity meter humping HWDP	hybrid mode hybrid scale hydrate hydration hydraulic bypass hydraulic cement hydraulic centralizer hydraulic disconnect hydraulic fracture monitoring hydraulic fracturing hydraulic head hydraulic horsepower hydraulic packer hydraulic power pack hydraulic pumping hydraulic release tool hydraulic set hydraulic-set hydrocarbon hydrocarbon indicator hydrocarbon kitchen hydrochloric acid hydrocyclone hydrocycloning hydrofluoric acid hydrofluoric hydrochloric acid hydrofluoric-hydrochloric acid hydrogen blistering hydrogen embrittlement hydrogen index hydrogen induced failures hydrogen ion concentration hydrogen probe hydrogen sulfide hydrolysis hydrometer hydrophile-lipophile balance number hydrophilic hydrophobic hydrophone hydrostatic bailer hydrostatic head hydrostatic pressure hydrothermal hydrothermal alteration hydroxyethyl starch hydroxyethylcellulose hydroxypropyl starch hygrometer hygroscopic
I
ID ideal gas IEOM igneous IIP illite ilmenite IM image image well imbibition immature immiscible impedance impeller impermeable impermeable barrier impressed current anodes impulse activation impulsive seismic data in line in situ in situ combustion in situ fluid analysis in situ viscosity evaluation in-line in-situ in-situ combustion in-situ fluid analysis in-situ viscosity evaluation incident angle inclination inclinometer incompetent indicator indicator methods indicator models induced gamma ray spectroscopy induced particle plugging induced polarization induction induction electrical survey inelastic neutron scattering inert sulfide inertial resistance infinite acting radial flow infinite acting reservoir infinite conductivity fracture	infinite-acting reservoir infinite-conductivity fracture inflatable packer inflow performance relationship information theory inhibit inhibited acid inhibition inhibitive mud inhibitor initial flow period initial reservoir pressure initial shut in period initial shut-in period injection gas injection line injection mandrel injection pattern injection pressure injection pulsed neutron log injection pump injection test injection water injection well injection well testing injection-well testing injection/pulsed neutron log injectivity test injector head insert inside blowout preventer inside diameter instrument hanger instrumented pig intelligent well intensifier interfacial tension interference testing intermediate intermediate casing intermediate casing string intermittent gas lift internal flash internal phase internal pulling tool interpolation interpretation interstitial gas	interstitial water interval method interval time interval transit time interval velocity interwell tomography invaded zone invasion inverse inverse filter inverse problem inversion invert emulsion invert emulsion oil mud invert-emulsion oil mud inverted five spot inverted five-spot IO ion exchange IP IPA IPR iron carbonate iron oxide iron stabilizer iron sulfide iron-oxidizing bacteria irreducible water ISO isochore isochron isochron map isochronal test isolated porosity isomerized olefin isopach isopropanol isopropyl alcohol isostasy isostatic isostatic correction isotropic isotropic formation isotropic permeability isotropy iterative forward modeling iterative methods
J
J factor J slot J-slot jack up jacking frame jackup rig jar jar test	jet jet cutter jet hopper jet mixer jet nozzle jet perforating jet pump jet velocity joint	Joule Thomson Joule-Thomson jug jug hustler junk junk basket junk pusher junk sub
K
K coefficient k-means cluster analysis kaolinite karst KB kelly kelly bushing kelly down kelly hose kelly spinner	kerogen keyseat kh kick kill kill line kill pump kill weight fluid kill-weight fluid kill-weight mud kilogram per cubic meter	kilopascal kinetic effect Kirchhoff equation Kirchhoff migration knock out knockout Koch curve kriging kriging weights kurtosis
L
lacustrine lag lag gas lag time Lame constant laminar flow laminated sand lamination landing collar landing nipple LAO Laplace equation laser diffraction last reading last-shot detection late time transient data late-time transient data lateral latex layer layer cake geometry layer stripping layer-cake geometry layered reservoir testing lb/bbl lbm/bbl LC₅₀ LCM lead acetate test lead cement leak detection leak off leakoff leakoff test leaky mode lean gas lean gas condensate lean glycol lean oil lease least time path least-time path leonardite lessor royalty levelwind LGS licensing round life of the well lifting frame lifting sub light crude oil	light hydrocarbons light pipe lignin lignite lignosulfonate lime mud limestone limestone compatible scale limestone porosity unit limestone-compatible scale limited entry line drive line source solution line-source solution linear alphaolefin linear flow liner liner hanger liner patch lipophilic liquefied natural gas liquefied natural gas carrier liquefied petroleum gas liquid additive liquid blocking liquid desiccant liquid hydrocarbons liquid level liquid saturation method liquid-junction potential lithification lithofacies lithologic lithologic contact lithology lithosphere lithostatic pressure lithostratigraphic lithostratigraphic inversion lithostratigraphy littoral live cement live oil LNG LNGC load cell load oil local content local holdup local probe lock	lock mandrel lock-up log logarithmic mean logging logging run logging tool logging unit logging while drilling long path multiple long spacing sonic log long-path multiple long-spacing sonic log longitudinal plot longitudinal relaxation longitudinal weld loose emulsion lost circulation lost circulation material lost returns lost-circulation material LOT Love wave low colloid oil mud low gravity solids low solids mud low solids nondispersed mud low specific gravity solids low velocity layer low yield clay low-colloid oil mud low-gravity solids low-pressure, low-temperature filtration test low-solids mud low-solids, nondispersed mud low-specific-gravity solids low-velocity layer low-yield clay lowstand systems tract LPG LS lubricant lubricator lubricator valve lubricity LWD lyophilic lyophilic colloid lyophobic lyophobic colloid
M
M_f Ma mafic magma magnesium test magnetic constant magnetic flux leakage magnetic mud magnetic permeability magnetic resonance magnetic reversal sequence magnetic-flux leakage magnetics magnetometer magnetotelluric method make a connection make hole make up make up water make-up water makeup cathead makeup gas makeup tongs mandrel manifold mantle map marginal well marine marine drilling riser marine flooding surface marker bed marker joint marketing agreement marsh Marsh funnel Marsh funnel viscosity mass balance massif mast mast unit master valve material balance material balance equation Material Safety Data Sheet material-balance equation matrix matrix acidizing matrix stimulation maturation maturity maximum flooding surface maximum recorded temperature maximum treating pressure Maxwell's equations MBT test MD mean measure point measured depth measurement after drilling measurement error measurement range measurements while drilling measurements-while-drilling measuring tank mechanical diversion mechanical jar mechanical skin mechanical sticking median medium medium induction membrane potential memory gauge meniscus mercury displacement method metagenesis metal gain metal loss metamorphic metamorphism meter meter calibration meter capacity meter difference	meter factor meter slippage methane methane hydrate methyl orange methyl orange alkalinity methylene blue dye methylene blue test methylglucoside drilling fluid mica micellar polymer flooding micellar-polymer flooding micelle micrite microannulus microcylindrical log microgel microlaterolog microlog micropaleontology microporosity microresistivity microseismic monitoring microspherical log middle time transient data middle-time transient data midoceanic ridge midpoint midrange migrate migration Milankovitch cycles milk emulsion mud mill mill out mill shoe milligrams per kilogram milligrams per liter milling million standard cubic feet mils per year penetration mineral mineral interest Minerals Management Service minifrac minimum restriction minimum time path minimum-time path minute mark mis tie mis-tie miscible miscible displacement mist mist drilling mist extractor mist flow mixed deposits mixed metal hydroxide mixed metal silicate mixed-metal hydroxide mixed-metal silicate MMH MMS MMscf mobile offshore drilling unit mobility mobility buffer model modeling modified isochronal test MODU modulus of compression modulus of elasticity modulus of rigidity Moho Mohorovicic discontinuity moldic porosity moment monkey board monkeyboard monomer monopole Monte Carlo risk analysis Monte Carlo sampling Monte Carlo simulation	montmorillonite monument moon pool morning tour mosquito bill motorman mousehole mousehole connection moveable hydrocarbons moved hydrocarbons moveout moving-source method mpy MRS Mscf/d MSDS MT mud mud acid mud additive mud aging cell mud anchor mud balance mud cell mud cleaner mud cup mud density mud engineer mud filtrate mud hopper mud house mud in mud in sample mud motor mud out mud out sample mud oven mud pit mud program mud pulse telemetry mud report mud retort mud return line mud scale mud still mud tracer mud up mud weight mud-aging cell mud-in sample mud-out sample mudcake mudding off mudding up mudrock multi-capacitance flowmeter multicomponent seismic data multifinger caliper multilateral multipass method multiphase multiphase flow multiphase fluid multiphase fluid flow multiphase holdup log multiphase meter multiphase pump multiple completion multiple isotope log multiple isotope spectroscopy multiple rate tests multiple reflection multiple regression multiple salinity multiple service contract multiple-isotope log multiple-isotope spectroscopy multiple-rate tests multishot survey mute mutual solvent MWD My MYBP mysid shrimp
N
naphthene base crude oil naphthene-base crude oil naphthenic hydrocarbon native clay native solids mud native state core native-solids mud natural completion natural fracture natural frequency natural gamma ray spectroscopy natural gas natural gas liquids natural gasoline natural remanent magnetism naturally flowing well naturally occurring radioactive materials (NORM) near surface correction near-surface correction neat cement neritic nest nested fractal structures net gas production net oil production net profits interest net revenue interest neural networks	neutral point neutralization neutralize neutralizing solution neutron activation log neutron capture neutron generator neutron interactions neutron log neutron porosity neutron-activation log Newtonian fluid NGL nipple nipple down nipple up nipple-down nipple-up nitrified fluid nitrogen cushion nitrogen kickoff nitrogen lift nitrogen lifting nitrogen unit NMO NMR no go landing nipple no-go landing nipple NODAL* analysis	noise noise log nominal filter non-Darcy flow non-Newtonian fluid nonconductive drilling fluid nonconformity nonhydrocarbon contaminants nonideal gas nonparticipating royalty nonparticipating royalty interest normal normal fault normal incidence normal mode normal moveout normal moveout correction normal pressure normal-moveout correction normality NPDES NRM nuclear fluid densimeter nuclear magnetic resonance nuclear magnetic resonance measurement numerical methods numerical model numerical reservoir simulation
O
O ring O-ring OBC OBR observer Occam's inversion ocean-bottom cable OCMA octahedral layer octanol octyl alcohol OD off pattern well off-pattern well offset offset vertical seismic profile offset VSP offset well Ohm's law oil and gas lease oil and gas separator oil base mud oil content oil emulsion mud oil field oil formation volume factor oil in water emulsion oil kitchen oil mud oil on cuttings oil pool oil prone oil sand oil water contact oil water interface	oil well oil wet oil-base mud oil-emulsion mud oil-in-water emulsion oil-mud emulsifier oil-prone oil-water contact oil-water interface oil-wet oil/brine ratio oil/water ratio oilfield oilfield battery olefinic hydrocarbon oligomer one dimensional seismic data one way time one-dimensional seismic data one-way time onlap OOC open flow potential open hole open-flow potential openhole openhole completion openhole gravel pack openhole packer openhole test opening bomb operating agreement operating gas-lift valve (OGLV) operating interest operator	optical index optical probe organic acid organic deposit organophilic organophilic clay organophilic lignite orifice meter orifice valve orogenic orogeny OSHA osmosis osmotic pressure OSPAR outcrop outlet spool outside diameter ovality limit over travel overbalance overburden overflush overmature overpressure overriding royalty overriding royalty interest overshot overthrust overtravel OWR oxide closure model oxide-closure model oxygen activation oxygen scavenger
P
p rate p wave P&A p-rate P-wave P_f P_m PAC pack off packer packer flowmeter packer fluid packing gland packoff pad paddle blender paddle mixer PAG paid up lease paid-up lease pair production paleontology paludal palustrine palynology PAO paraffin paraffin base crude oil paraffin control paraffin inhibitor paraffin scraper paraffin scratcher paraffin-base crude oil paraffinic hydrocarbon paraformaldehyde parallel fold parallel resistivity parameter parametric parasequence parasequence boundary parasequence set PARCOM partial completion partial penetration participating interest particle plugging apparatus particle size distribution particle-plugging apparatus particle-plugging test particle-size distribution parts per billion parts per million party party chief party manager pascal pass passive margin patch pay payout PDC bit peak PEF peg leg multiple peg-leg multiple penetration rate peptization peptize peptized clay peptizing agent perforate perforate overbalanced perforate underbalanced perforated interval perforated liner perforating acid perforating charge perforating depth control log perforating depth-control log perforating fluid perforating gun perforation perforation density perforation penetration perforation phasing periodogram permafrost permanent datum permanent well monitoring permeability permeability thickness permeable permeameter permittivity perpendicular offset perpendicular resistivity petal basket flowmeter petrographic petrography petroleum petroleum system petroleum systems modeling petrologic petrology petrophysical model petrophysical rock type pH pH test phantom phase phase redistribution phase shift phase shift resistivity phase velocity log phase-shift resistivity phase-velocity log phenolphthalein phosphate salt photoelectric effect photon log PHPA PHPA mud PI pick	pick-up Pickett plot pickle pickling fluid pickup pig pig run pigging pill pilot mill pilot test pin pinch out pinch-out pipe dope pipe heavy pipe light pipe rack pipe ram pipe stretch pipe trip pipeline pipeline capacity pipeline gas pipeline oil pipeline patrol PIT Pitot tube pitting plane table plane wave plankton plant plastic plastic deformation plastic fluid plastic viscosity plate out plate tectonics plateau platform play play back playback PLT plug and abandon plug flow plugging material plunge plunger lift plunger overtravel PNP POD point bar point of departure poise Poisson distribution Poisson's ratio polar polar compound polarity polarity standard polarization horn polarization time polished joint polished rod polyacrylamide polyacrylate polyalkalene glycol polyalphaolefin polyanionic cellulose polyanionic lignin polycrystalline diamond compact bit polyelectrolyte polyglycerol polymer polymer plug polyol polyolefin polyphosphates polysaccharide pony rod pooling poppet valve pore pore gas pore pressure pore pressure gradient pore pressure transmission pore throat pore-pressure gradient pore-pressure transmission porosimeter porosity porosity exponent porosity unit porous porous medium porous plate technique portland cement portland cement clinker positive displacement pump positive-displacement pump post post mature post-mature potassium potassium ion potassium mud potential field pounds per barrel pour point power fluid injection rate power law fluid power oil power-fluid injection rate power-law fluid pozzolan pozzolanic PPA ppb ppg ppm PPT precipitate precipitation precision	preferential right to operate preferential right to purchase preflush pregelatinized starch prehydrate prehydrated bentonite prehydration premium thread preservation preservative preserved core pressure pressure buildup pressure buildup analysis pressure capability pressure depletion pressure drawdown pressure falloff pressure gauge pressure gradient pressure hunt pressure integrity test pressure sender pressure squared plot pressure storage tank pressure transient analysis pressure transient test pressure transient well test pressure transient well tests pressure-drawdown analysis pressure-squared plot pressure-transient analysis pressure-transient well tests pressurized mud balance primary cementing primary completion components primary migration primary porosity primary production primary recovery primary recovery method primary reflection primary term prime mover primer cord principal axis principal component analysis probability probe probing processing produced fluid produced water producing formation producing well production production bonus production casing production log production packer production payment production penalty production period production service contract production sharing contract production string production tubing production wing productivity index (PI) productivity test profile profile modification profile testing profiling profit oil progradation progressive cavity pumping system progressive gels propagation constant propagation resistivity propagation resistivity measurement propagation time proppant propylene glycol normal propyl ether prorated well proration unit prospect proximity log pseudogeometrical factor pseudoplastic pseudopressure plot pseudostatic spontaneous potential pseudosteady state PSP pull out of the hole pull up pull-up pulling tool pulse echo pulse-echo pulsed neutron holdup log pulsed neutron spectroscopy log pulsed neutron spectroscopy measurement pulsed-neutron holdup log pump barrel pump cavitation pump manifold pump off pump submergence pump volumetric efficiency pump-off pumpability pumper pumping schedule pumping tee pumping time pumping well pumping well tests push down push-down pusher PV PVT pyrolysis pyrophosphate pyrrhotite
Q
Q Q wave Q-wave QA quadrant density quality assurance	quantile map quartile quartz quat quat amine quaternary amine	quebracho quick lime quick look quicklook quitclaim
R
R signal R-signal R_h R_v R_wa rabbit racking back pipe radial array radial differential temperature log radial differential-temperature log radial processing radial refraction radial resolution radial response radio safe detonator radio silence radio-safe detonator radioactive tracer radioactive tracer log radioactive-tracer log radius of curvature radius of investigation ram blowout preventer ram preventer random error random noise random walk method random-walk method range of load rarefaction rate dependent skin effect rate of penetration rate of shear rate-dependent skin effect rathole raw crude oil raw natural gas ray ray path ray tracing Rayleigh wave raypath RCRA real time data real-time data ream receiver reciprocate reciprocating pump recirculating mixer record recorded data recorder recorder carrier recoverable gas lift gas recovery recovery forecast red mud redox reduced water slurry reduced-water slurry reducing agent reef reefal reel reel back tension reel back-tension reeled tubing reference point	reflection reflection coefficient reflection tomography reflectivity reflector refraction refractive index refractor refracturing regression regression coefficient regressive relative age relative dielectric constant relative dielectric permittivity relative filtrate volume relative humidity relative permeability relaxation time relaxed filtrate oil mud relaxed-filtrate oil mud release joint relinquishment remedial cementing remote sensing remotely operated vehicle repeat section repeatability reproducibility reserve mud pit reserve pit reserve-mud pit reservoir reservoir characterization reservoir characterization model reservoir communication reservoir description reservoir drive mechanisms reservoir height reservoir heterogeneities reservoir modeling reservoir pressure reservoir simulation reservoir-drive mechanisms residence time residual bend residual oil resin resistive invasion resistivity resistivity index resistivity log resolution resolution matched response matched restored state core retarder retention time retort retort method retort solids retort test retrievable bridge plug retrievable gun retrievable packer retrogradation retrograde condensation returns reverse circulating valve	reverse circulation reverse combustion reverse fault reverse-circulating valve reversing out RH rheologic rheological rheological property rheology rheology modifier rhombohedral packing rich gas rich gas condensate rich glycol rich oil Ricker wavelet rift rig rig down rig floor rig up right angle set right of first refusal right-angle set rigless operation RIH ring resistivity ringworm corrosion RM rock rock mechanics rock properties rock types rod elevators rod pump rod string rod unit roll a tank roll line roller cone bit roller stem roller-cone bit rolling aging test rolling-aging test root mean square velocity root-mean-square velocity rotary bushing rotary drilling rotary hose rotary steerable system rotary table rotational gas lift roughneck round thread round trip roustabout routine core analysis ROV royalty royalty interest RP rugose rugosity run run in hole running squeeze running tool rupture disk
S
S wave S-wave s.g. sabkha sack sacrificial anode safety clamp safety head safety joint safety ram safety spacer sag SAGD salt salt dome salt plug salt proximity survey salt proximity vertical seismic profile salt proximity VSP salt-proximity vertical seismic profile salt-proximity VSP saltwater flow saltwater mud sample frequency sample interval sample rate sampling error sampling interval sand sand bailer sand cleanout sand consolidation sand control sand lifting sand line sand out sand production sand test sand trap sandface sandout sandstone sandstone compatible scale sandstone petrography sandstone porosity unit sandstone-compatible scale SAPP SARA analysis satellite platform saturated solution saturation saturation equation saturation exponent saturation unit saver sub SBR scale scale inhibitor scale inhibitor squeeze scale removal scale-inhibitor squeeze scallop gun SCAT scattergram scavenger SCC scintillation detector scout scout ticket scraper scraper trap scratcher screen screen out screenout scrub scrubber scrubber oil seabed geophone seal seal assembly seal receptacle sealbore sealbore packer seals seating nipple seawater mud secondary cementing secondary migration secondary porosity secondary porosity index secondary production secondary recovery secondary reflection secondary term secondary-porosity index sediment sedimentary sedimentary basin sedimentation seismic seismic acquisition seismic impedance seismic interpretation seismic line seismic modeling seismic processing seismic record seismic reflection tomography seismic refraction method seismic section seismic stratigraphy seismic survey seismic trace seismic velocity seismic wave seismic while drilling vertical seismic profile seismic-while-drilling vertical seismic profile seismogram seismograph seismology seismometer selective firing selective nipple selective perforating selective running tool semblance semisubmersible sensitivity separator separator backpressure separator gas sepiolite sequence sequence boundary sequence stratigraphy sequential Gaussian simulation sequestering agent setting tool settling pit settling tank severance SH wave SH-wave shadow zone shaker shale shale baseline shale gas shale shaker shaly shaped charge shear shear modulus shear pin shear ram shear rate shear seal BOP shear stock shear strain shear strength shear strength measurement test shear stress shear wave shear-seal BOP shear-strength measurement test shearometer sheave sheen sheen test shelf shifted spectrum shifting tool shoe shoe joint shoe track shoot a level shoot a well short trip short-path multiple shot depth shot detection shot point shotpoint shoulder bed show shrimp test shut in bottomhole pressure shut in royalty shut-in bottomhole pressure shut-in pressure shut-in royalty	SIBHP SIBP side pocket mandrel side scan sonar side-pocket mandrel side-scan sonar siderite sideswipe sidetrack sidewall sidewall core Sierpinski gasket sieve analysis sigma signal signal to noise ratio signal-to-noise ratio signature signature deconvolution silica silica layer silicate silicate anion silicate mineral silicate mud silicic acid siliciclastic sediment silt silver nitrate similar fold simple multiple simulated annealing simultaneous operation (SIMOP) sinc x single pass method single phase single phase flow single shot survey single tank composite sample single-pass method single-phase single-phase flow single-shot survey single-tank composite sample sinistral sinker bar sintered sinusoid SIP sized calcium carbonate sized salt skewness skid skin skin depth skin effect skin factor slaked lime slant hole rig slant rig slant stack slant-hole rig slickline slide sliding sleeve slim hole well slime forming bacteria slime-forming bacteria slimhole well slip slip and cut slip joint slip lock slip velocity slip-and-cut slips sloughing shale slow formation slow release inhibitor slow-release inhibitor slowing-down length slowing-down time slowness slowness time coherence slowness-time coherence sludge slug slug flow slugging slugging compound slugging pill slurries slurry slurry density slurry stability slurry yield small pore water small-pore water smectite smectite clay smile Snell's law SNG snub snubber snubbing snubbing basket snubbing force snubbing jack soak phase soap soda ash sodium acid pyrophosphate sodium bicarbonate sodium carbonate sodium chromate sodium dichromate sodium hydroxide sodium phosphate sodium polyacrylate sodium silicate soft line soft rock soft water softline Solar terrestrial rhythms solid desiccant solution gas solution gas drive solution gasdrive sonde sonde error sonic sonic log sonic measurement sonolog sorting sound sour sour corrosion sour crude oil sour gas source source pattern source point source rock sourcepoint Soxhlet extractor SP SPA space frequency domain space out space-frequency domain spacer spacer fluid spacing spacing unit special core analysis (SCAL) specific gravity specific permeability spectral spectral density analysis spectral gamma ray spectrum spherical divergence spherical flow spherical focusing spherical harmonic spherical separator spherical wave spill point spin flowmeter spine and ribs plot spinner flowmeter spinner reversal spinning chain spiral borehole spline spontaneous potential spooler spot spot sample spotting spotting fluid spread spreading loss spud spud mud spurt loss square log squeeze squeeze cementing	squeeze job squeeze manifold squeeze packer squeeze pressure squeeze tool SRB SSMA SSMA copolymer SSP stab stab in stab-in stabbing valve stability meter stabilization stabilized stabilized gas well stable arch stack stacking velocity stage separation staged fracturing stand stand pipe standard batch standing valve standoff standpipe starch static aging test static correction static filter press static filtration static fluid level static pressure static spontaneous potential static-aging test statics stationarity stationary slips stationary snubbers statistics STB steady state steady state behavior steady-state behavior steam steam assisted gravity drainage steam chamber steam flood steam management steam oil ratio steam soak steam-oil ratio steamflood stearate steerable motor stem step profile step rate test stick and slip stimulation stimulation byproduct stimulation fluid stochastic analysis stochastic methods stochastic modeling stock tank stock tank barrel Stoneley permeability Stoneley wave storm choke storm packer strain strainer strap strapping strapping tape strata stratified flow stratigraphic analysis stratigraphic trap stratigraphy stratum streamer streamer feathering strength retrogression stress stress corrosion cracking stress induced anisotropy stress-corrosion cracking stress-induced anisotropy strike strike fault strike-slip fault strip gun stripper rubber stripping stripping ram stroke stroke jars strokes per minute structural structural analysis structural shale structural trap structure structure map stuck stuck pipe stylolite styrene sub subduction submersible drilling rig subsalt subsea well subsidence subsurface pressure subsurface safety valve (SSSV) subsurface surface controlled safety valve (SSCSV) subsurface surface-controlled safety valve (SSCSV) sucker rod sucker rod pump suction pit sulfate reducing bacteria sulfate resistance sulfate resistant cement sulfate-reducing bacteria sulfate-resistant cement sulfide sulfide scavenger sulfide stress cracking sulfide test sulfonated asphalt sulfonated polystyrene-maleic anhydride copolymer sulfur light crude summation of fluids method superficial velocity superposition superposition in space superposition in time supply vessel suppression surface casing surface controlled subsurface safety valve (SCSSV) surface interest surface pipe surface pressure surface shut-in surface tension surface wave surface-controlled subsurface safety valve (SCSSV) surfactant surge tank surrounding bed survey suspended solids SV wave SV-wave swab swab valve swabbing swage swaging tool swamp sweep efficiency sweep pill sweet sweet corrosion sweet crude sweet crude oil sweet gas sweet spot sweetening swellable packer swivel SWR syn syncline synthetic base fluid synthetic base mud synthetic fault synthetic natural gas synthetic seismogram synthetic seismograms synthetic-base fluid synthetic-base mud synthetic/brine ratio synthetic/water ratio systematic error systems tract
T
T₁ T₂ tag tail tail buoy tail cement tail mute tail pipe Taitel Dukler Taitel-Dukler tall oil tally TAME tangential plot tangential wave tank tank battery tank bottoms tank calibration tank dike tank table tankage tanker tannic acid tannin taper tap tapered cutoff tapered string TAPS TAR tar sand Taylor bubbles TCP TD TDEM TE TEA technical evaluation agreement tectonic environment tectonics tectonism telemetry tell tale tell-tale telluric current telluric current method telluric-current method TEM temperature gradient temperature log temperature stability temperature survey ten minute gel strength ten second gel strength ten-minute gel strength ten-second gel strength tensile strength tension-set packer tensor methods TEOR term lease terrain correction terrestrial tertiary recovery test separator tetrahedral layer Texas deck TFNB TG THAI theoretical thermal capture thermal diffusion length thermal gradient thermal maturity thermal neutron absorber thermal neutron porosity measurement thermal recovery thermal simulation thermally activated mud emulsion thickening time thief thief hatch thief zone thinner	thixotropic thixotropy thorium thousand standard cubic feet per day thread protector thread rule threadform three component seismic data three dimensional seismic data three dimensional survey three phase flow three phase separator three-component seismic data three-dimensional seismic data three-dimensional survey three-phase flow three-phase separator threshold velocity through flowline (TFL) through tubing gun through-flowline (TFL) through-tubing through-tubing gun thrust fault tick mark tie tie back liner tie back packer tie-back liner tie-back packer tie-back string tight tight emulsion tight gas tight hole time after bit time domain time domain electromagnetic method time lapse time lapse seismic data time migration time slice time-domain electromagnetic method time-lapse time-lapse seismic data timed slug analysis timed-slug analysis titrate titration TM TOC toe to heel air injection tomography tongs tool joint tool string toolpusher top drive top lease top log interval topdrive topographic map tornado chart torpedo torque flowmeter total depth total hardness test total organic carbon total porosity total solids tour trace tracer tracer ejector measurement tracer loss measurement tracer measurement tracer-ejector measurement tracer-loss measurement track Trans-Alaska Pipeline System transform fault transgression transgressive transgressive surface transient drainage radius transient electromagnetic method	transient pressure transient rate and pressure test analysis transient-pressure response transient-pressure testing transient-rate and pressure-test analysis transit time transition flow transition zone transpression transtension transverse electric mode transverse magnetic mode transverse relaxation trap travel joint traveling block traveling valve travelling slips travelling snubbers traveltime treater treating iron treatment fluid trend trip trip gas trip out trip pill triplex pump tripping pipe trough true amplitude recovery true resistivity true stratigraphic thickness true vertical depth true vertical thickness true-amplitude recovery tube wave tubing broach tubing conveyed perforating tubing displacement tubing end locator (TEL) tubing grade tubing hanger tubing head tubing job tubing joint tubing performance curve (TPC) tubing pressure tubing puncher tubing seal assembly tubing testing tool tubing thread tubing-conveyed perforating tubing-end locator tubing-retrievable safety valve (TRSV) tubingless completion tubular jar tubulars tuff tuffaceaous tuning effect turbidite turbidity current turbulent flow turnkey TVD twist off twist-off two dimensional seismic data two dimensional survey two pass method two phase flow two phase separator two way traveltime two-dimensional seismic data two-dimensional survey two-pass method two-phase flow two-phase separator two-way traveltime TWT type curve analysis type curves type-curve analysis
U
U-tube effect Udden-Wentworth scale ULCC ultra heavy oil ultra-long spaced electrical log ultrafine ultralarge crude carrier ultrasonic caliper ultrasonic measurement uncertainty uncertainty principle unconformity unconformity trap unconventional resource	under travel underbalance underbalanced underground blowout underground gas storage underpressure underpressured underream undersaturated fluid undershooting undertravel undisturbed zone uniformitarianism unitization	unitized production units conversion factor Universal Transverse Mercator grid (UTM) unload unloading valve unsteady state unweighted mud updip upgrader upset upstream upstroke upward continuation uranium
V
V-G meter VAMA VAPEX vapor extraction vapor pressure vapor recovery unit variable rate variable-density log varimax rotation variogram varve vee door vee-door velocity velocity analysis velocity anomaly velocity correction velocity correction factor velocity image velocity layering velocity map	velocity shot measurement velocity string velocity survey velocity-correction factor velocity-shot measurement verification verification listing versenate vertical lift vertical resistivity vertical resolution vertical response vertical seismic profile vertical separator vertical severance very large crude carrier vesicle vesicular vesicular porosity VG meter vibrator	vibratory seismic data vinyl acetate-maleic anhydride copolymer vinyl polymer virgin pressure virgin zone vis viscosity viscosity and gel-strength test viscous oil vitrinite vitrinite reflectance VLCC volcanic volcano volumetric cross section volumetric efficiency VSP vug vuggy vugular vugular porosity
W
Wadati-Benioff zone WAG wait on cement wait time walk above vertical seismic profile walk above VSP walk-above vertical seismic profile walk-above VSP walkaway vertical seismic profile walkaway VSP wall cake wall loss wall sticking Walsh-Hadamard transform Walther's law wash out wash over wash pipe washout washover washover pipe washover shoe wastewater cleanup water alternating gas water base drilling fluid water base mud water block water bottom roll water clarification water coning water control water cushion water cut water cut meter water drive water filled resistivity water flood water flow log water formation volume factor water gun water in oil emulsion water influx water loss water mud water mud emulsifier water oil ratio water production water saturation water to cement ratio	water wet water, oil and solids test water-base drilling fluid water-base mud water-bottom roll water-cut meter water-filled resistivity water-flow log water-in-oil emulsion water-mud emulsifier water-to-cement ratio water-wet water/oil ratio waterdrive waterflood waterflood kick waterflooding wave wave equation waveform wavefront wavelength wavelet wavelet extraction wavenumber weak point weathered layer weathering weathering correction weevil weight weight indicator weight material weighted mud weighting agent weighting material well cleanup well control well flow rate well interference well interference testing well log well placement well plan well potential well production rate well servicing well shoot well stimulation well-interference testing	wellbore wellbore damage wellbore diagram wellbore fill up wellbore fill-up wellbore storage effects wellbore-storage effects wellhead wellhead backpressure Wentworth scale wet clay porosity wet combustion wet gas wet oil wet-clay porosity wettability wettability change whole core whole mud dilution whole-mud dilution wiggle trace wildcat window wing valve wiper plug wiper trip wire clamp wire wrapped screen wire-wrapped screen wireline wireline cutter wireline formation test wireline formation tester wireline grab wireline log wireline retrievable safety valve (WRSV) wireline-retrievable safety valve (WRSV) WOC WOR work basket work station work string working interest workover workover fluid workover string worm wormhole wrench fault
X
X signal X-radiography X-ray diffraction (XRD)	X-ray fluorescence (XRF) X-signal xanthan gum	XC polymer xylene
Y
yield yield point	yield stress Young's modulus	YP
Z
Z/A effect zero crossing zero offset data zero offset vertical seismic profile zero phase zero zero gels zero-offset data	zero-offset vertical seismic profile zero-phase zero-zero gels zinc basic carbonate zinc bromide zinc carbonate zinc chloride	zinc oxide zip collars zip grooves Zoeppritz equations zonal zone

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