Oilfield Glossary
Oilfield Glossary
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Variables and Numbers

a 1D seismic data 3C seismic data 4C seismic data
m 1-D seismic data 3D seismic data 4D seismic data
n 2D survey 3D survey 6FF40
Sw 2-way traveltime


a acrylamido methyl propane sulfonate polymer amplitude anomaly area open to flow
API Recommended Practice 10B Recommended Practice for Testing Well Cements acrylamido-methyl-propane sulfonate polymer amplitude distortion areal displacement efficiency
API Specification 10A – Specification for Cements and Materials for Well Cementing acrylate polymer amplitude variation with offset areal sweep efficiency
abandonment costs activation log AMPS arenaceous
abnormal events active sulfide anaerobic armor
abnormal pressure activity of aqueous solutions analog aromatic content test
abrasion test acyclic compound anchor pin aromatic hydrocarbon
abrasive jetting additivity angle of approach array
absolute age adhesion tension angle of incidence array induction
absolute filter adjacent bed angle valve array laterolog
absolute open flow potential adjustable choke anhydrite array propagation resistivity
absolute permeability adjusted flow time aniline point test array sonic
absolute pressure adsorbed gas anion arrival
absolute volume adsorption anionic arrival time
absorptance advective transport modeling anisotropic artificial intelligence
absorption aeolian anisotropic formation artificial lift
absorption band aeolotropy anisotropy as delivered BTU
absorption oil aerated layer annubar as-delivered BTU
abyss aerobic annular blowout preventer ASME
abyssal aeromagnetic survey annular BOP ASP flooding
accelerator AFE annular flow asphalt
accelerator source afterflow annular gas flow asphaltene precipitation
accretion AGC annular pressure asphaltenes
accumulation AGC time constant annular space asphaltic crude
accumulator agglomeration annular velocity asphaltic mud additive
accuracy aggradation annulus assignment
acetic acid aggradational anode asthenosphere
acid aggregate anomalous ASTM
acid effect aggregation anomaly atmospheric corrosion
acid frac air cut mud anoxic attapulgite
acid gas air drill antialias filter attenuation
acid inhibitor air drilling anticlinal attenuation resistivity
acid job air gun anticlinal trap attitude
acid stimulation air wave anticline attribute
acid tank air-cut mud antifoam audio measurement
acid wash Alford rotation antifoam agent aulacogen
acidize alias filter antisqueeze authigenic
acidizing aliasing antithetic fault authority for expenditure
acoustic alidade antiwhirl bit autocorrelation
acoustic basement aliphatic compound AOF automatic gain control
acoustic coupler alkaline AOFP autotrack
acoustic emission alkaline flooding aperture autotracking
acoustic impedance alkaline-surfactant-polymer flooding API AVA
acoustic log alkalinity test API fluid loss test AVAZ
acoustic mode allochthon API fluid-loss test average reservoir pressure
acoustic positioning allochthonous API gravity average velocity
acoustic transducer allogenic API unit AVO
acoustic transparency alluvial API water AVOAZ
acoustic traveltime all-welded construction apparent anisotropy axial loading
acoustic velocity alpha processing apparent dip axial surface
acoustic velocity log altered zone apparent matrix axis of rotational symmetry
acoustic wave alum apparent velocity azimuth
acquisition aluminum activation log apparent wavelength azimuthal
acquisition log aluminum stearate appraisal azimuthal density
acrylamide acrylate polymer amides aquifer azimuthal laterolog
acrylamide polymer amines Archie equation azimuthal resolution
acrylamide-acrylate polymer amplitude Archie rock


back flow bead tracer blind shear ram brake
back in beam blind zone break
back off beam pump blind-shear ram break circulation
back pressure bean block break out
back pressure valve bean choke blockage breakdown pressure
back propagation Bearden units of consistency block-and-bleed breaker
back stripping Beaufort scale blow down breakout
back up bed wrap blow out breakout cathead
back up ring bedrock blow out preventer breakout tongs
back wash bel blow-by breakthrough
backflow bell nipple blowdown bridge
background gas belt effect blowdown valve (BDV) bridge off
back-in benchmark blowing the drip bridge plug
backoff Benioff zone blowout bridge-off
backpressure benthic blowout preventer bridging agent
back-pressure benthos BLPD bridging material
back-pressure valve bentonite BM bridle
back-propagation bentonite equivalent BOD Briggs color cube
backscatter BGG body wave bright spot
back-stripping BHA Boltzmann probability distribution brine
backup curve BHCT bond log bring in the well
back-up ring BHP Bond number British thermal unit
backward multiple-contact test BHST bonus consideration broach
backwash BHT Boolean simulation broadside array
bactericide bias weld booster bromide brine
balance point bicarb BOP bromocresol green
balanced activity oil mud bicarbonate BOP stack Brookfield viscometer
balanced array bichromate salt borehole brownfield
balanced plug bid and study agreement borehole compensation Brownian motion
balanced-activity oil mud big hole charge borehole correction BS&W
ball catcher big-hole charge borehole gravity bubble count
ball diverter bilinear flow borehole gravity meter bubble flow
ball out bimetallic corrosion borehole orientation bubble point
ball sealers bimetallism borehole seismic data bubblepoint
ball valve bin borehole televiewer bubble-tight shutoff
ballout Bingham plastic model bottle test bucking coil
band bioaccumulation bottom log interval bucking current
band limited function bioassay bottom sample buffalo head
band pass biochemical oxygen demand bottomhole assembly buffer
band-limited function biocide bottomhole choke buffer solution
band-pass bioconcentration bottomhole circulating temperature buffered mud
bank firing biodegradation bottomhole gas separator buffered solution
barefoot biopolymer bottomhole heater buggy vibro
barefoot completion Biot theory bottomhole injection pressure (bhip) buildup test
barite biphasic bottomhole pressure bulk modulus
barite plug bird bottomhole sampler bulk relaxation
barrel equivalent birefringence bottomhole shut in bulk volume
barrel pump bit bottomhole shut-in bull plug
barrels of liquid per day bit box bottomhole static temperature bullet perforating
barrels of oil per day bit breaker bottomhole temperature bullhead
barrels of water per day bit nozzle bottoms up bundle
base exchange bit record bottoms up mud sample buoyancy
base log bit resistivity bottoms-up buoyancy method
base map bit trip bottoms-up mud sample burn over
base of weathering bitumen Bouguer anomaly burn shoe
base oil bivariate analysis Bouguer correction burn-over
base station black list Bouma sequence butt weld
baseline Blaine fineness bound fluid butterfly chart
basement bland coring fluid bound water butterfly valve
basic wavelet blank pipe boundary conditions button resistivity
basin blast joint bounded reservoir BWOB
basket blast sleeve bound-fluid log BWOW
basket flowmeter blasting cap bow tie BWPD
basket sub bleed off bow-spring centralizer by weight of blend
batch mixer bleedoff line Boyle's Law Double Cell by weight of water
batch treatment blended crude Boyle's Law Single Cell bypass
bathyal blender brachistochrone bypass velocity
battery site blind box braided line bypassed mud
Bc blind ram


C pump cement extender coal seam gas contour interval
cable cement head coalbed methane contour map
cable head cement plug coal-bed methane contract depth
cable-tool drilling cement retainer coalesce control line
cake cement retarder coalescence control valve
cake thickness cement squeeze coal-seam gas controlled time survey
calcite cementation coating controller
calcium bromide cementation exponent coating flaw convection
calcium carbonate cementer COD conventional mud
calcium carbonate plug cementing coding conventional reservoir
calcium chloride cementing engineer COFCAW convergence
calcium contamination cementing plug cogeneration convergent
calcium hydroxide centralizer coherence converted wave
calcium mud centrifugal pump coherence map conveyance
calcium naphthenate centrifuge coherence vector map convolution
calcium oxide CERCLA coherent convolve
calcium sulfate cesium acetate coherent noise copolymer
calcium test cesium formate coiled tubing copper carbonate
calibration chain tongs coiled tubing completion core
caliche chalk coiled tubing connector core analysis
caliper log channel coiled tubing drilling core gamma log
camera channel wave coiled tubing string core image
cap channeling coiled tubing unit core plug
cap the well character coke core testing
capacitance log Charpy test cokriging coreflooding
capacitance meter check shot survey cold heavy oil production with sand coring fluid
capacity factor (of a valve), Cv, Kv check valve cold production corkscrew hole
capillary number check-shot survey collapse pressure corrected gamma ray
capillary pressure curve chelating agent collar correcting pressure to a datum
capillary suction time test chelation collar locator correlate
capillary tube viscometer chemical barrel collar lock correlation
capillary-suction-time test chemical cutter collar log correlation log
caprock effect chemical diverter collector correlogram
capsule gun chemical flooding collision corrosion
carbide lag test chemical injection colloid corrosion control
carbon dioxide chemical marker injection colloidal corrosion coupon
carbon dioxide corrosion chemical neutron source colloidal suspension corrosion fatigue
carbonate chemical oxygen demand combi BOP corrosion inhibitor
carbonate gamma ray chemical potential combination string corrosion rate
carbonate ion chemical wash come out of the hole corrosion-resistant alloy (CRA)
carbonate scale chemical-marker injection command trailer cosurfactant
carbonate test Chenevert Method commingled completion counterbalance weight
carboxymethyl starch chloride test commingled flow counterbalance winch
carboxymethylcellulose chlorite common depth point coupling
carried working interest choke common midpoint coupon
carrier fluid choke line common midpoint method CPMG
carrier gun choke manifold common offset craton
carry over CHOPS common reflection point creaming
carrying capacity Christmas tree common-offset crest
carryover chromate salt compaction cresting
cartridge chrome lignite company man critical angle
cased hole chrome tubing company representative critical damping
casing chromic salt compartment critical flow rate
casing bowl chronostratigraphic chart compatibility critical gas flow rate
casing burst pressure churn flow compatible scales critical matrix
casing centralizer CI compensated density log critical rate
casing collar circle shooting compensated neutron log critical reflection
casing collar locator (CCL) circulate compensated-density log crooked hole
casing collar log circulate out competent crop out
casing completion circulation device complete a well cross dipole
casing coupling circulation loss completion cross over
casing grade circulation sub completion fluid cross section
casing gun circulation system completion quality (CQ) crosscorrelate
casing hanger circulation time completion skin crosscorrelation
casing hardware circulation valve complex trace analysis crosscorrelation flowmeter
casing head citric acid complex-trace analysis crossflow
casing inspection log city gate composite frac tree crossline
casing joint classical reservoir modeling composite log crosslinker
casing patch clastic intrusion composite stream crossover
casing point clastic sediment compositional fluid analysis crossover service tool
casing potential profile clathrate compressibility crossplot
casing pressure clay compression ratio crossplot porosity
casing roller clay bound water compressional wave cross-sectional
casing scraper clay extender compression-set packer crosswell electromagnetic tomography
casing shoe clay stabilizer compressor crosswell reflection tomography
casing shoe test clay swelling Compton scattering crosswell seismic tomography
casing spool clay water interaction computed tomography crosswell tomography
casing string clay-bound water concentric crown block
casing swage clay-water interaction concentric fold crown valve
casing thread clean conceptual model crushed zone
casing valve clean out concession crust
casinghead cleanout condensate crustal magnetic field
casing-inspection log cleanup condensate liquids crystallization temperature
casing-potential profile clear brine condensed section CSG
cat line clear water drilling condensing drive CSS
cataclasite clear-water drilling conditional simulation CT
cataclastic close in conductive invasion cubic packing
catagenesis closed chamber testing conductive rock matrix model cultural anomaly
cathead closed in well conductivity cultural noise
cathodic protection closed mud system conductometric titration cumulative production
cation exchange capacity closed-chamber testing conductor pipe curve fitting
cation-exchange capacity closed-in well conformable curve matching
catline close-in conformity cushion
catwalk closing unit conical projection cut
caustic potash closure coning cut and thread fishing technique
caustic soda closure pressure connate water cut oil
cave effect cloud point connection cut point
cavings cloud point glycol connection gas cut-and-thread fishing technique
cavitation cluster consistency Cutt point
CBM cluster analysis consistometer cuttings
CDP CMC constant composition expansion cuttings lifting
CEC CMC-Hi Vis constant rate CWA
cellar CMC-HVT contact cycle gas
cellulosic polymer CMC-Lo Vis contact angle cycle time
cement CMC-LVT contact time cyclic steam injection
cement accelerator CMP contaminant cycling plant
cement additive CMS continental shelf cyclothem
cement bond log CO2 injection continuous gas lift cylinder
cement dispersant coal continuous reservoir cylinder operator
cement evaluation log coal bed methane contour


damage depth section direct indicating viscometer drill bit
damaged zone depth wheel direct-indicating viscometer drill collar
damping depth-derived directional driller drill in fluid
darcy derivative logs directional drilling drill noise vertical seismic profile
Darcy units derrick directional permeability drill pipe
dart derrick floor directional survey drill ship
data rate derrickman directional variograms drill solids
datum desander directional well drill string
datum level desiccant directivity drillable packer
day rate desilter disbonding drilled solids
daylight tour detail log disconformity driller
dB detectable limit discontinuity driller's depth
DD detergency disharmonic drill-in fluid
DEA unit deterministic deconvolution dispersant drilling break
dead oil deterministic methods dispersed bubble flow drilling contractor
Dean-Stark extraction detonate dispersion drilling crew
decibel detonating cord displacement drilling detergent
decollement detonator displacement efficiency drilling fluid
deconvolution detrital displacement front drilling foreman
deep induction detritus disposal well drilling mud
deep penetrating charge development dissolved solids drilling procedure
deep seismic sounding deviated drilling distillation extraction drilling program
deep tow deviated hole distortion drilling rate
deep-penetrating charge deviation distributed temperature log drilling rig
deepwater play deviation survey distributed-temperature log drilling riser
deep-water play dew point distribution drilling-fluid engineer
deflector flowmeter dewatering divergence drill-noise vertical seismic profile
deflocculant dewpoint diversion drillpipe
deflocculate dextral diverter drillpipe conveyed
deflocculated mud diagenesis diverter flowmeter drillship
deflocculation diagenetic diverting agent drillstem
defoamer diameter of invasion division order drillstem test
degasser diameter of investigation Dix formula drillstring
degree API diamond bit DMO drip
dehydrate diapir dog collar drip accumulator
dehydration diatom dog house droop
dehydrator diatomaceous dog leg drop ball
delay rental dichromate salt doghouse drop bar
deliverability test dielectric constant dogleg drop sub
delta dielectric permittivity dolomite dropoff gun
delta rho dielectric propagation log dolomitization drop-off gun
delta t dielectric resistivity dolostone dropout
delta t stretch diesel oil mud domain dry bed
deltaic diesel-oil mud domainal fabric dry bed dehydrator
delta-t stretch diesel-oil plug domainal structure dry combustion
demulsifier difference map dome dry forward combustion
densimeter differential compaction doodlebugger dry gas
densitometer differential pressure dope dry hole
density contrast differential pressure sticking dosing pump dry oil
density current differential SP double block-and-bleed dry rock
density measurement differential spectrum double refraction dry-bed dehydrator
departure curve differential sticking down dip DSS
dephasing differential temperature log down lap DST
depleted zone differential weathering correction down stroke DST pressure chart
depletion differential-temperature log downdip dual completion
deployment system difficult to disperse downhole gauge dual induction
deposit difficult to disperse in salt downhole receiver dual permeability reservoir
depositional energy diffraction downhole safety valve (DSV) dual porosity reservoir
depositional environment diffraction stack downhole sensors dual water
depositional system diffusion downhole source dual-permeability reservoir
depth control diffusion equation downlap dual-porosity reservoir
depth controller diffusion relaxation downstroke due diligence
depth conversion dilatancy drag bag dummy valve
depth correlation dilatancy theory drag bit dump bailer
depth datum dilatation drag-bag duplex pump
depth derived dilatational wave drain hole dye penetrant inspection
depth map diluent drainage dynamic filter press
depth mark dilution water drainage area dynamic filtration
depth matched dim spot drainage volume dynamic fluid level
depth matching dip drained test dynamic miscibility
depth migration dip correction drainhole dynamic positioning
depth of invasion dip fault draw down dynamic range
depth of investigation dip moveout drawdown dynamic seal
depth point dip tube drawdown test dynamic-aging test
depth reference dipole drawworks dynamite
depth reference point direct emulsifier drift dynamometer


early time transient data electric probe endfire array estimated ultimate recovery
early-time transient data electric submersible pump endless tubing estuarine
earthquake electrical anisotropy endpoint estuary
easy to disperse in salt electrical conductivity enhanced diffusion eta (η)
eccentralizer electrical double layer enhanced oil recovery Euclidian dimension
eccentric electrical impedance probe entrained gas Euclidian distance
eccentricity electrical log entrance hole eustasy
ECD electrical permittivity environmental corrections eustatic
echo spacing electrical resistivity eolian eustatic sea level
EDA electrical stability test EOR evaporation pit
eddy current electrode device Eötvös number evaporite
eddy current measurement electrode resistivity EPA evaporitic
eddy-current measurement electrodynamic brake epithermal neutron porosity measurement evening tour
EDTA electrokinetic potential epm event
effective laminar flow electromagnetic caliper epsilon (ε) excavation effect
effective medium theory electromagnetic heating equalizing loop excess cement
effective permeability electromagnetic method equalizing valve exit velocity
effective porosity electromagnetic propagation equation of state expanding gate valve
effective velocity electromagnetic propagation measurement equivalent circulating density expansion joint
effective water saturation electromagnetic thickness equivalent conductance expectation
effective wellbore radius elevation correction equivalent sack expendable gun
elastic elevator equivalent water resistivity expert system
elastic anisotropy embedded wavelet equivalent weight exploration
elastic constants embrittlement ERD exploration play
elastic deformation emergency shutdown valve (ESDV) erode exploratory
elastic impedance empirical erosion extended reach drilling
elastic limit emulsifier erosion corrosion extended-reach drilling
elastic moduli emulsion erosion-corrosion extensive dilatancy anisotropy
elastic neutron scattering emulsion flow error external cutter
elastic wave emulsion mud ES test external disturbance field
elasticity encapsulation escape line external pulling tool
electric gas lift valves end point ESP external upset
electric gas-lift valves


facies finite wellbore solution flow stream formic acid
facies modeling finite-conductivity fracture flow structure forward modeling
fairway finite-wellbore solution flow unit forward multiple-contact test
fall off test fire flooding flow-after-flow tests forward problem
falloff test fireflooding flowback four component seismic data
Fann viscometer firing head flow-concentrating four dimensional seismic data
far water first arrival flower structure four-component seismic data
farmor first break flowing neutron log four-dimensional seismic data
farmout first reading flowing pressure Fourier analysis
fast diffusion first-contact miscibility flowing well Fourier transform infrared spectroscopy
fast formation fish flowline FPSO
fast formation arrival fish eye flowline manifold frac balls
fast Fourier transform fishbone wells flowline mud sample frac crew
fast neutron reaction fishing flowline sample frac fluid
fast-formation arrival fishing bell flowmeter frac gel
fast-neutron reaction fishing diagram flowstream frac gradient
fatty acid fishing neck flowstream sample frac gun
fatty acid soap fishing tool flue gas frac head
fatty-acid soap fitting fluid compatibility test frac iron
fault five spot fluid compressibility frac job
fault trap five-spot fluid contact frac manifold
Faye correction fixed choke fluid density log frac stack
fee simple interest fixed source method fluid flow frac tree
fee-simple interest fixed-cutter bit fluid interface log frac valve
feldspar fixed-source method fluid level fractal
felsic f-k domain fluid loss control fractal networks
fence diagram f-k plot fluid loss control material fracture
Fermat's principle flag fluid pound fracture acidizing
ferrous sulfide flag joint fluid tester fracture conductivity
FFT flake LCM fluid-density log fracture gradient
fiber LCM flake lost circulation material fluid-friction reducer fracture half-length
fiber lost circulation material flake lost-circulation material fluid-interface log fracture networks
fiber lost-circulation material flange fluid-loss additive fracture permeability
field flapper valve fluid-loss control fractured well analysis
field weld flare fluid-loss-control material fractured-well analysis
fill sub flash point fluoboric acid fracturing fluid
film forming amine flat gels fluoroscopy fracturing mandrel
film-forming amine flexural mode flush joint fracturing manifold
filter FLNG flush production fracturing pressure
filter cake float collar flushed zone fracturing sleeve
filter cake quality float joint flushed zone water saturation free air correction
filter cake thickness float shoe flushed-zone water saturation free fluid
filter cell floc fluvial free gas
filter loss flocculate flux leakage free induction decay
filter medium flocculation foam breaker free point
filter press flood front foam diversion free point indicator
filtercake flooding pattern foam flooding free water
filtercake quality flooding surface foam generator free water knockout
filter-cake quality flow after flow foamed cement free-air correction
filtercake thickness flow after flow tests foaming agent free-induction decay
filter-cake thickness flow assurance foamy oil free-point indicator
filtered brine flow back fold free-water knockout
filters flow check footprint frequency
filtrate slump flow coefficient, Cv foreign content fresh core
filtrate tracer flow concentrating formate fresh water
filtrate volume flow coupling formation Fresnel zone
filtration flow cross formation damage friction effect
filtration test cell flow efficiency formation evaluation friction reducer
filtration tester flow line formation evaluation while drilling froth flow
final flow period flow loop formation exposure time full waveform
final shut in period flow meter formation factor Full-azimuth towed-streamer acquisition
final shut-in period flow model formation fluid fullbore
fines migration flow period formation fracture pressure fullbore spinner
fingerboard flow profile formation pressure funnel viscosity
fingering flow regime formation water FWKO
finite conductivity fracture


galena gasdrive geopressured graveyard tour
Galling gas-holdup log geostatic pressure gravimeter
galvanic anodes gas-lift mandrel geostatistical methods gravity anomaly
gamma (γ) gas-lift valve geostatistical modeling gravity drainage
gamma ray densitometer gas-oil contact geostatistics gravity override
gamma ray interactions gas-water contact geosteer gravity segregation
gamma ray log gas-well deliverability geosteering gravity toolface
gamma-gamma log gaswell gas geothermal gradient gravity-stable displacement
Garrett Gas Train gaswell liquids Geronimo line gray list
gas anchor gate valve GGT grease injection system
gas bearing gather ghost grease-injection system
gas buster gathering system gilsonite greasing out
gas cap gauge hole gin pole greedy algorithm
gas cap drive gauge pressure gland bushing green gas
gas chimney gauge tank glass jar test green list
gas condensate Gaussian collocated cosimulation glauconite greenfield
gas coning Gaussian techniques Global Positioning System grey list
gas cut mud gel strength globe valve grind
gas deviation factor gelled mud GLR gripper blocks
gas drive gelled up mud glycol gross production
gas gravity gelled-up mud glycol absorber ground roll
gas holdup log gels glycol dehydrator groundwater
gas hydrate geochemical log glyph group
gas in solution geochemistry goat head group interval
gas injection geologic map GOC group velocity
gas interference geologic time scale goose neck growth fault
gas lift geologist gooseneck guar gum
gas lift mandrel geomagnetic polarity reversal GPS guard log
gas lift valve geomagnetic polarity time scale GPTS guide shoe
gas lock geomagnetic secular variation GR guided wave
gas migration geomechanics graben gumbo
gas oil contact geometric gradiomanometer gun
gas processing plant geometrical factor grain density gun barrel
gas sand geophone granular LCM gun clearance
gas separator geophone array granular lost circulation material gun the pits
gas show geophone cable granular lost-circulation material gun zero
gas volume fraction (GVF) geophone interval gravel pack gunk
gas water contact geophone offset gravel pack gun gunk plug
gas well geophone pattern gravel pack log gunk squeeze
gas well deliverability geophysicist gravel pack screen gunning the pits
gas/liquid ratio (GLR) geophysics gravel-pack gun GWC
gas-bearing geopressure gravel-pack log gyp mud
gas-cap drive geopressure gradient gravel-pack screen gypsum
gas-cut mud


H2S HGS hookwall packer hydraulic fracture monitoring
hade HHP hopper hydraulic fracturing
haematite hiatal horizon hydraulic head
halite hiatus horizon slice hydraulic horsepower
hammer union hierarchical cluster analysis horizontal drilling hydraulic power pack
hangoff high explosive horizontal resistivity hydraulic power unit
hard rock high pressure squeeze horizontal separator hydraulic pumping
hardbanding high shot density gun horizontal tree hydraulic release tool
hardfacing high side toolface Horner slope hydraulic set
hardground high temperature completions horst hydraulic-set
hardness ion high-gravity solids hostile environment hydrocarbon indicator
harmonic high-pressure air injection hot lime hydrocarbon kitchen
harmonic distortion high-pressure manifold hot oiler hydrochloric acid
hatch high-pressure squeeze hot oiling hydrocyclone
HCl high-pressure, high-temperature hot tapping hydrocycloning
HE starch high-pressure, high-temperature filtration test hot waterflooding hydrofluoric acid
head high-pressure, high-temperature viscometer Hough transform hydrofluoric hydrochloric acid
head wave high-shot density gun housing hydrofluoric-hydrochloric acid
header highside toolface HP starch hydrogen blistering
header box high-side toolface HPHT hydrogen embrittlement
heading high-specific-gravity solids HPHT filtration test hydrogen index
heater highstand systems tract HPHT viscometer hydrogen induced failures
heater treater history matching HPU hydrogen sulfide
heavy metal HLB number HSE hydrolysis
heavy oil hodogram HUD hydrometer
heavy pipe holdup huff and puff hydrophile-lipophile balance number
heavyweight drillpipe holdup depth Humble formula hydrophilic
HEC holdup image humic acid hydrophobic
hectorite holdup log humidity hydrophone
hematite holdup map humping hydrostatic bailer
Herschel Bulkley fluid holdup meter HWDP hydrostatic head
Herschel-Bulkley fluid hole cleaning hybrid scale hydrostatic pressure
hertz hollow carrier gun hydrate hydrothermal
hesitation squeeze homogeneity hydration hydrothermal alteration
heterogeneity homogeneous hydraulic bypass hydroxyethyl starch
heterogeneous homogeneous formation hydraulic cement hydroxyethylcellulose
heterogeneous formation hook hydraulic centralizer hydroxypropyl starch
HF hook load hydraulic disconnect hygroscopic


ICD inelastic neutron scattering injection-well testing inverse filter
ICV inert sulfide injectite inverse problem
ID inertial resistance injectivity test inversion
ideal gas infill drilling injector head invert emulsion
IEOM infinite acting radial flow in-line invert emulsion oil mud
igneous infinite acting reservoir inner seat ring inverted five spot
ilmenite infinite conductivity fracture inside blowout preventer inverted five-spot
IM infinite-acting reservoir inside-out air seat test invert-emulsion oil mud
image infinite-conductivity fracture in-situ combustion IO
image well inflatable packer in-situ fluid analysis ion exchange
imbibition inflow control device in-situ viscosity evaluation IP
immiscible inflow control valve instrument hanger IPA
impedance inflow performance relationship intelligent well IPR
impeller information theory intensifier iron carbonate
impermeable inhibit interfacial tension iron oxide
impermeable barrier inhibited acid interference testing iron stabilizer
impressed current anodes inhibition intermediate casing iron sulfide
improved oil recovery inhibitive mud intermediate casing string iron-oxidizing bacteria
impulse activation inhibitor intermittent gas lift irreducible water
impulsive seismic data initial flow period internal flash ISO
in line initial reservoir pressure internal pulling tool isochron map
in situ combustion initial shut in period international nautical mile isochronal test
in situ fluid analysis initial shut-in period interpolation isolated porosity
in situ viscosity evaluation injection mandrel interstitial gas isomerized olefin
incident angle injection pattern interstitial water isopropanol
inclination injection pressure interval method isopropyl alcohol
incompetent injection pulsed neutron log interval time isostasy
indicator methods injection pump interval transit time isostatic
induced gamma ray spectroscopy injection test interval velocity isotropic
induced particle plugging injection water interwell tomography isotropic formation
induced polarization injection well invaded zone isotropy
induction injection well testing invasion iterative forward modeling
induction electrical survey injection/pulsed neutron log inverse


J factor jar test jet perforating jug hustler
J slot jet jet pump junk
jacking frame jet cutter joint junk basket
jackup jet hopper Joule Thomson junk pusher
jackup rig jet mixer Joule-Thomson junk sub
jar jet nozzle J-slot


K coefficient kerogen kill pump k-means cluster analysis
kaolinite keyseat kill weight fluid knock out
karst kh kill-weight fluid knockout
KB kick kill-weight mud knot
kelly kick off kilogram per cubic meter Koch curve
kelly bushing kickoff kinetic effect kriging
kelly down kill Kirchhoff equation kriging weights
kelly hose kill line Kirchhoff migration kurtosis
kelly spinner


lacustrine least-time path liquid desiccant loose emulsion
lag leonardite liquid hydrocarbons lost circulation
lag gas lessor royalty liquid level lost circulation material
Lamé constant levelwind liquid saturation method lost returns
laminar flow LGS liquid-junction potential lost-circulation material
laminated sand licensing round listric fault LOT
landing collar life of the well lithification Love wave
landing nipple lifting frame lithosphere low colloid oil mud
LAO lifting sub lithostatic pressure low gravity solids
Laplace equation light hydrocarbons lithostratigraphic low solids mud
laser diffraction light pipe lithostratigraphic inversion low solids nondispersed mud
last reading lignin lithostratigraphy low specific gravity solids
late time transient data lignite littoral low velocity layer
lateral lignosulfonate live cement low yield clay
late-time transient data lime mud LNGC low-colloid oil mud
layer limestone compatible scale load cell low-gravity solids
layer cake geometry limestone porosity unit load oil low-pressure, low-temperature filtration test
layer stripping limestone-compatible scale local content low-salinity waterflooding
layer-cake geometry limited entry local holdup low-solids mud
layered reservoir testing line drive local magnetic interference low-solids, nondispersed mud
lbm/bbl line source solution local probe low-specific-gravity solids
LC50 linear alphaolefin lock lowstand systems tract
LCM linear flow lock mandrel low-velocity layer
lead acetate test liner lock-up low-yield clay
leak detection liner hanger log LS
leak off liner patch logging run lubricant
leakoff line-source solution logging tool lubricator
leakoff test lip seal logging unit lubricator valve
leaky mode lipophilic logging while drilling LWD
lean gas liquefied natural gas logging-while-drilling lyophilic
lean gas condensate liquefied petroleum gas long spacing sonic log lyophilic colloid
lean glycol liquid additive longitudinal relaxation lyophobic
lease liquid blocking long-spacing sonic log lyophobic colloid
least time path


m measurement after drilling milling mud additive
Mf measurement error mineral mud aging cell
mafic measurement range mineral interest mud balance
magma measurements while drilling mineralogy mud cell
magnesium test measurements-while-drilling Minerals Management Service mud cleaner
magnetic field mechanical diversion minifrac mud cup
magnetic flux leakage mechanical jar minimum miscibility concentration mud density
magnetic mud mechanical skin minimum miscibility enrichment mud engineer
magnetic particle inspection (MPI) mechanical specific energy minimum miscibility pressure mud hopper
magnetic resonance mechanical sticking minimum restriction mud house
magnetic reversal sequence median minimum time path mud in
magnetic toolface medium induction minimum-time path mud in sample
magnetic total field membrane potential minute mark mud motor
magnetic-flux leakage memory gauge mis tie mud out
magnetics meniscus miscible mud out sample
magnetotelluric method mercury displacement method miscible displacement mud oven
main magnetic field metagenesis missile mud pit
make a connection metal gain mist drilling mud program
make hole metal loss mist extractor mud pulse telemetry
make up metal-to-metal seal mist flow mud report
make up water metamorphic mis-tie mud retort
makeup cathead metamorphism mixed deposits mud return line
makeup tongs meter capacity mixed metal hydroxide mud scale
make-up water meter difference mixed-metal hydroxide mud still
managed pressure drilling meter slippage MMC mud tracer
mandrel methane MME mud up
manifold methane hydrate MMH mud weight
mantle methyl orange MMS mud-aging cell
map methyl orange alkalinity mobility buffer mudcake
marginal well methylene blue dye mobility control mudding up
marine methylene blue test mobility ratio mud-in sample
marine drilling riser methylglucoside drilling fluid model mud-out sample
marine flooding surface micellar polymer flooding modified isochronal test mudrock
marker bed micellar-polymer flooding modulus of elasticity Multiazimuth towed-streamer acquisition
marker joint micelle modulus of rigidity multi-capacitance flowmeter
marketing agreement microannulus Moho multicomponent seismic data
marsh microbial enhanced oil recovery Mohorovicic discontinuity multifinger caliper
Marsh funnel microcylindrical log moment multilateral
Marsh funnel viscosity microemulsion monkey board multipass method
mass balance microgel monkeyboard multiphase
massif microlaterolog monomer multiphase flow
mast microlog monopole multiphase fluid
mast unit micropaleontology Monte Carlo risk analysis multiphase fluid flow
master valve microporosity Monte Carlo simulation multiphase holdup log
material balance equation microresistivity montmorillonite multiphase meter
Material Safety Data Sheet microseismic monitoring monument multiphase pump
material-balance equation microspherical log moon pool multiple completion
matrix middle time transient data morning tour multiple rate tests
matrix acidizing middle-time transient data mosquito bill multiple reflection
matrix stimulation midoceanic ridge motorman multiple regression
maturation midpoint mousehole multiple salinity
maturity midrange moveable hydrocarbons multiple service contract
maximum flooding surface migrate moved hydrocarbons multiple-contact miscibility
maximum recorded temperature migration moveout multiple-rate tests
maximum treating pressure Milankovitch cycles moving-source method multishot survey
maximum working pressure (MWP) milk emulsion mud MRS multiwell pad
Maxwell's equations mill MSDS mute
MBT test mill out MT mutual solvent
MD mill shoe mud MWD
measure point milligrams per kilogram mud acid mysid shrimp
measured depth milligrams per liter


n near surface correction Newtonian fluid non-Darcy flow
NACE near-surface correction nipple nonhydrocarbon contaminants
naphthene base crude oil needle valve nipple down nonideal gas
naphthene-base crude oil neritic nipple up non-Newtonian fluid
Narrow-azimuth seismic data nest nipple-down nonparticipating royalty
native clay net oil production nipple-up nonparticipating royalty interest
native solids mud net profits interest nitrified fluid normal
native state core net revenue interest nitrogen cushion normal fault
native-solids mud neural networks nitrogen injection normal incidence
natural completion neutral point nitrogen kickoff normal mode
natural fracture neutralization nitrogen lift normal moveout
natural frequency neutralize nitrogen lifting normal moveout correction
natural gamma ray spectroscopy neutralizing solution nitrogen unit normal pressure
natural gas neutron activation log NMO normality
natural gas liquids neutron capture NMR normal-moveout correction
natural gasoline neutron generator no go landing nipple NPDES
natural remanent magnetism neutron interactions no-go landing nipple NRM
naturally flowing well neutron log noise nuclear fluid densimeter
naturally occurring radioactive materials (NORM) neutron porosity noise log nuclear magnetic resonance
nautical mile neutron-activation log nonconductive drilling fluid nuclear magnetic resonance measurement


OBC oil mining one-way time O-ring
OBR oil mud onlap orogenic
observer oil pool OOC orogeny
Occam's inversion oil sand open flow potential OSHA
ocean-bottom cable oil swelling open hole osmosis
OCMA oil water contact open-flow potential osmotic pressure
octahedral layer oil water interface openhole OSPAR
octanol oil well openhole completion outcrop
octyl alcohol oil wet openhole gravel pack ovality limit
off pattern well oil/brine ratio openhole packer over travel
off-pattern well oil/water ratio openhole test overbalance
offset oil-base mud opening bomb overburden
offset vertical seismic profile oil-emulsion mud operating agreement overflush
offset VSP oilfield operating gas-lift valve (OGLV) overpressure
offset well oilfield battery operating interest overriding royalty
Ohm's law oil-in-water emulsion operator overriding royalty interest
oil and gas lease oil-mud emulsifier optical index overshot
oil and gas separator oil-water contact optical probe overtravel
oil bank oil-water interface organic acid OWC
oil base mud oil-wet organic deposit OWR
oil emulsion mud olefinic hydrocarbon organophilic oxide closure model
oil field oligomer organophilic clay oxide-closure model
oil formation volume factor one dimensional seismic data organophilic lignite oxygen activation
oil in water emulsion one way time orifice meter oxygen scavenger
oil kitchen one-dimensional seismic data orifice valve


p wave permittivity polyanionic lignin pressure-squared plot
P&A perpendicular offset polycrystalline diamond compact bit pressure-transient analysis
pack off perpendicular resistivity polyelectrolyte pressure-transient well tests
packer petal basket flowmeter polyglycerol pressurized mud balance
packer flowmeter petrographic polymer primary completion components
packer fluid petrography polymer flooding primary migration
packing petroleum system polymer plug primary production
packing gland petroleum systems modeling polyol primary recovery
packoff petrophysical model polyolefin primary recovery method
pad petrophysical rock type polyphosphates primary reflection
paddle blender pH polysaccharide primary term
paddle mixer pH test pony rod prime mover
PAG phantom POOH primer cord
paid up lease phase pooling principal axis
paid-up lease phase redistribution poppet valve principal component analysis
pair production phase shift pore probe
paleontology phase shift resistivity pore gas processing
paludal phase velocity pore pressure produced fluid
palustrine phase velocity log pore pressure gradient produced water
palynology phase-shift resistivity pore pressure transmission producing formation
PAO phase-velocity log pore throat producing well
paraffin phenolphthalein pore-pressure gradient production
paraffin base crude oil phosphate salt pore-pressure transmission production bonus
paraffin control photoelectric effect porosimeter production casing
paraffin inhibitor photon log porosity production log
paraffin scraper PHPA porosity exponent production packer
paraffin scratcher PHPA mud porosity unit production period
paraffin-base crude oil pick porous production service contract
paraffinic hydrocarbon Pickett plot porous medium production sharing contract
paraformaldehyde pickle porous plate technique production string
parallel fold pickling fluid portland cement production tree
parallel resistivity pickup portland cement clinker production tubing
parameter pick-up positive displacement motor production wing
parametric pig positive displacement pump productivity index (PI)
parasequence pill positive-displacement pump productivity test
PARCOM pilot mill post profile modification
partial completion pilot test potassium profit oil
participating interest pinion shaft potassium ion progradation
particle plugging apparatus pipe dope potassium mud progressive cavity pumping system
particle size distribution pipe heavy potential field progressive gels
particle-plugging apparatus pipe light pounds per barrel propagation constant
particle-size distribution pipe rack pour point propagation resistivity
partitioning pipe ram power fluid injection rate propagation resistivity measurement
parts per million pipe stretch power law fluid propagation time
party pipe trip power-fluid injection rate proppant
party chief pipeline capacity power-law fluid propylene glycol normal propyl ether
party manager pipeline gas pozzolan prorated well
pass pipeline oil pozzolanic proration unit
passive margin pipeline patrol PPA prospect
patch PIT ppb proximity log
pay pitch-and-lead ppg pseudogeometrical factor
payout Pitot tube ppm pseudoplastic
PDC bit pitting PPT pseudopressure plot
PDM plane table precipitate pseudostatic spontaneous potential
peak plane wave precipitation pseudosteady state
peak shaving plastic precision pull out of the hole
PEF plastic deformation preferential right to operate pull up
peg leg multiple plastic fluid preferential right to purchase pulling tool
peg-leg multiple plastic viscosity preflush pull-up
pendant-drop tensiometer plate out pregelatinized starch pulse echo
penetration rate plate tectonics prehydrate pulsed neutron holdup log
peptization plateau prehydrated bentonite pulsed neutron spectroscopy log
peptize play prehydration pulsed neutron spectroscopy measurement
peptizing agent plug and abandon premium thread pulsed-neutron holdup log
perforate plug flow preservative pulse-echo
perforate overbalanced plug valve preserved core pump barrel
perforate underbalanced plugging material pressure buildup pump cavitation
perforated interval plunge pressure buildup analysis pump manifold
perforated liner plunger lift pressure capability pump off
perforating acid plunger overtravel pressure depletion pump submergence
perforating charge PNP pressure drawdown pump volumetric efficiency
perforating depth control log point bar pressure falloff pumper
perforating depth-control log Poisson distribution pressure gauge pumping time
perforating fluid Poisson's ratio pressure gradient pumping well
perforating gun polar pressure hunt pumping well tests
perforation polar compound pressure integrity test pump-off
perforation density polarity pressure sender push down
perforation phasing polarity standard pressure squared plot push-down
permafrost polarization horn pressure storage tank pusher
permanent datum polarization time pressure transient analysis PV
permanent well monitoring polished joint pressure transient test PVT
permeability polyacrylamide pressure transient well test P-wave
permeability thickness polyacrylate pressure transient well tests pyrolysis
permeable polyalkalene glycol pressure-composition diagram pyrophosphate
permeameter polyalphaolefin pressure-drawdown analysis pyrrhotite


Q quantile map quebracho quicklook
Q wave quat amine quick lime quitclaim
QA quaternary amine quick look Q-wave
quality assurance


R signal redox reservoir heterogeneities rig up
Rwa reduced water slurry reservoir pressure right angle set
rabbit reduced-water slurry reservoir quality (RQ) right of first refusal
racking back pipe reducing agent reservoir simulation right-angle set
radial array reef reservoir-drive mechanisms rigless operation
radial differential temperature log reefal residence time RIH
radial differential-temperature log reel residual bend ring resistivity
radial faulting reel back tension residual oil ringworm corrosion
radial processing reel back-tension residual oil saturation rising-bubble apparatus
radial refraction reeled tubing resin RM
radial resolution reference point resistive invasion road box
radio safe detonator reflection resistivity rock
radio silence reflection coefficient resistivity index rock mechanics
radioactive tracer reflection tomography resistivity log rock properties
radioactive tracer log reflectivity resolution Rockwell hardness number
radioactive-tracer log reflector resolution matched Rockwell hardness testing
radiographic inspection refraction response matched rod elevators
radio-safe detonator refractive index restored state core rod pump
radius of curvature refractor retarder rod string
radius of investigation refracturing retention time rod unit
ram blowout preventer regression retort roll a tank
ram preventer regression coefficient retort method roller cone bit
random noise regressive retort solids roller stem
range of load relative age retort test roller-cone bit
rarefaction relative dielectric constant retrievable bridge plug rolling aging test
rate dependent skin effect relative dielectric permittivity retrievable gun rolling-aging test
rate of penetration relative filtrate volume retrievable packer root mean square velocity
rate of shear relative humidity retrogradation root-mean-square velocity
rate-dependent skin effect relative permeability retrograde condensation ROP
rathole relaxation time returns ROS
raw crude oil relaxed filtrate oil mud reverse circulating valve rotary bushing
raw natural gas relaxed-filtrate oil mud reverse circulation rotary drilling
ray release joint reverse combustion rotary hose
ray path relief valve reverse fault rotary steerable system
ray tracing remaining oil saturation reverse-circulating valve rotary table
Rayleigh wave remedial cementing reversing out rotating control device
raypath remote sensing RH roughneck
RCD remotely operated vehicle RH round thread
real time data repeat section rheologic round trip
real-time data repeatability rheological roustabout
ream replacement velocity rheological property routine core analysis
receiver reproducibility rheology royalty
reciprocate reserve mud pit rheology modifier royalty interest
reciprocating pump reserve pit rhombohedral packing R-signal
recirculating mixer reserve-mud pit rich gas condensate rugose
recorded data reservoir rich glycol rugosity
recorder reservoir characterization Rich-azimuth towed-streamer acquisition run
recorder carrier reservoir characterization model Ricker wavelet run in hole
recovery reservoir communication rift running squeeze
recovery forecast reservoir description rig running tool
recycled gas reservoir drive mechanisms rig down rupture disk
red mud reservoir height rig floor


S wave shear modulus small-pore water steam oil ratio
s.g. shear ram smectite steam soak
sack shear rate smectite clay steam trap
safety clamp shear seal BOP smile steam-assisted gravity drainage
safety head shear stock Snell's law steamflood
safety joint shear strain snub steam-oil ratio
safety spacer shear strength snubbing stearate
sag shear strength measurement test snubbing basket steerable motor
SAGD shear stress snubbing force stem
salt shear wave snubbing jack stem indicator
salt dome shearometer soak phase step profile
salt plug shear-seal BOP soap step rate test
salt proximity survey shear-strength measurement test soda ash stick and slip
salt proximity vertical seismic profile sheave sodium acid pyrophosphate stimulation
salt proximity VSP sheen sodium bicarbonate stimulation byproduct
salt-proximity vertical seismic profile sheen test sodium carbonate stimulation fluid
salt-proximity VSP shelf sodium chromate stochastic analysis
saltwater flow shifted spectrum sodium dichromate stochastic methods
saltwater mud shifting tool sodium hydroxide stochastic modeling
sample interval shoe sodium phosphate stock-tank oil initially in place
sampling interval shoe joint sodium polyacrylate stock-tank original oil in place
sand shoe track sodium silicate Stoneley permeability
sand bailer shoot a well soft rock Stoneley wave
sand cleanout short trip Solar terrestrial rhythms stopple
sand consolidation short-path multiple solid desiccant storm choke
sand control shot depth solubility storm packer
sand lifting shot detection solution gas strain
sand line shot point solution gas drive strainer
sand out shotpoint solution gasdrive strap
sand production shoulder bed sonde strapping tape
sand test show sonde error stratified flow
sand trap shrimp test sonic stratigraphic trap
sandface shut in bottomhole pressure sonic log streamer
sandout shut in royalty sonic measurement streamer feathering
sandstone shut-in bottomhole pressure sonolog stress corrosion cracking
sandstone compatible scale shut-in pressure SOR stress induced anisotropy
sandstone petrography shut-in royalty sorting stress-corrosion cracking
sandstone porosity unit SH-wave sound stress-induced anisotropy
sandstone-compatible scale SIBHP sour strike
SAPP SIBP sour corrosion strike fault
SARA analysis side pocket mandrel sour gas strike-slip fault
satellite platform side scan sonar source pattern strip gun
saturated solution side-pocket mandrel source point stripper rubber
saturation siderite source rock stripping
saturation equation side-scan sonar sourcepoint stripping ram
saturation exponent sideswipe Soxhlet extractor stroke
saturation unit sidetrack SP strokes per minute
saver sub sidewall SPA structural shale
SBR sidewall core space frequency domain structural steering
scale sieve analysis space out structural trap
scale inhibitor sigma space-frequency domain structure
scale inhibitor squeeze signal spacer structure map
scale removal signal to noise ratio spacer fluid stuck
scale-inhibitor squeeze signal-to-noise ratio spacing stuffing box
scallop gun signature spacing unit styrene
scattergram signature deconvolution specific gravity sub