Oilfield Glossary
Oilfield Glossary
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Variables and Numbers

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


a acrylamido-methyl-propane sulfonate polymer amplitude variation with offset area open to flow
API Recommended Practice 10B Recommended Practice for Testing Well Cements acrylate polymer amplitude variation with offset and azimuth areal displacement efficiency
API Specification 10A – Specification for Cements and Materials for Well Cementing activation log AMPS areal sweep efficiency
abandonment costs active margin anaerobic arenaceous
abnormal events active sulfide analog argillaceous
abnormal pressure activity of aqueous solutions anchor pin arithmetic mean
abrasion test acyclic compound angle of approach armor
abrasive jetting adapter spool angle of incidence aromatic content test
absolute age additivity angle valve aromatic hydrocarbon
absolute filter adhesion tension angular dispersion array
absolute open flow potential adjacent bed angular unconformity array induction
absolute permeability adjustable choke anhydrite array laterolog
absolute pressure adjusted flow time aniline point test array propagation resistivity
absolute volume adsorbed gas anion array sonic
absorbing boundary conditions adsorption anionic arrival
absorptance advective transport modeling anisotropic arrival time
absorption aeolian anisotropic formation artificial intelligence
absorption oil aeolotropy anisotropy artificial lift
abyss aerated layer annubar as delivered BTU
abyssal aeromagnetic survey annular blowout preventer as-delivered BTU
accelerator AFE annular BOP ASME
accelerator source afterflow annular flow ASP flooding
accelerometer AGC annular gas flow asphalt
accommodation AGC time constant annular pressure asphaltene onset concentration
accretion agglomeration annular production asphaltene onset pressure
accumulation aggradation annular space asphaltene precipitation
accumulator aggradational annular velocity asphaltenes
accuracy aggregate annuli asphaltic crude
acetic acid aggregation annulus asphaltic mud additive
acid air cut mud anode assignment
acid effect air drill anomalous asthenosphere
acid frac air drilling anomaly ASTM
acid gas air gun antialias filter atmospheric corrosion
acid inhibitor air shooting anticlinal attapulgite
acid job air wave anticlinal trap attenuate
acid number air-cut mud anticline attenuation
acid stimulation Alford rotation antifoam attenuation resistivity
acid tank alias filter antifoam agent attitude
acid wash aliasing antisqueeze attribute
acidity alidade antithetic fault audio measurement
acidize aliphatic compound antiwhirl bit aulacogen
acidizing alkaline AOF authigenic
acoustic alkaline flooding AOFP authority for expenditure
acoustic basement alkaline-surfactant-polymer flooding aperture autochthon
acoustic coupler alkalinity API autochthonous
acoustic emission alkalinity test API 6D: Specification for Pipeline Valves autocorrelation
acoustic impedance allochthon API cement automatic gain control
acoustic impedance section allochthonous API fluid loss test autotrack
acoustic log allogenic API fluid-loss test autotracking
acoustic mode alluvial API gravity AV
acoustic positioning alluvium API unit AVA
acoustic transducer all-welded construction API water AVAZ
acoustic transparency alpha processing apparent anisotropy average reservoir pressure
acoustic traveltime altered zone apparent dip average velocity
acoustic velocity alum apparent matrix AVO
acoustic velocity log aluminum activation log apparent velocity AVOAZ
acoustic wave aluminum stearate apparent viscosity axial loading
acquisition ambient temperature apparent wavelength axial surface
acquisition log amides applied-potential method axis of rotational symmetry
acrylamide acrylate polymer amines appraisal azimuth
acrylamide polymer amplitude aquifer azimuthal
acrylamide-acrylate polymer amplitude anomaly Archie equation azimuthal density
acrylamido methyl propane sulfonate polymer amplitude distortion Archie rock azimuthal laterolog


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


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


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


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


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


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


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


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


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


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


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


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


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


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


p rate perpendicular offset polarization horn pressure-composition diagram
p wave perpendicular resistivity polarization time pressure-drawdown analysis
P&A petal basket flowmeter polished joint pressure-squared plot
Pf petrographic polished rod pressure-transient analysis
Pm petrography polyacrylamide pressure-transient well tests
PAC petroleum polyacrylate pressurized mud balance
pack off petroleum system polyalkalene glycol primary cementing
packer petroleum systems modeling polyalphaolefin primary completion components
packer flowmeter petrologic polyanionic cellulose primary migration
packer fluid petrology polyanionic lignin primary porosity
packing petrophysical model polycrystalline diamond compact bit primary production
packing gland petrophysical rock type polyelectrolyte primary recovery
packoff pH polyglycerol primary recovery method
pad pH test polymer primary reflection
paddle blender phantom polymer flooding primary term
paddle mixer phase polymer plug prime mover
PAG phase redistribution polyol primer cord
paid up lease phase shift polyolefin principal axis
paid-up lease phase shift resistivity polyphosphates principal component analysis
pair production phase velocity polysaccharide probability
paleontology phase velocity log pony rod probe
paludal phase-shift resistivity POOH processing
palustrine phase-velocity log pooling produced fluid
palynology phenolphthalein poppet valve produced water
PAO phosphate salt pore producing formation
paraffin photoelectric effect pore gas producing well
paraffin base crude oil photon log pore pressure production
paraffin control PHPA pore pressure gradient production bonus
paraffin inhibitor PHPA mud pore pressure transmission production casing
paraffin scraper PI pore throat production log
paraffin scratcher pick pore-pressure gradient production packer
paraffin-base crude oil Pickett plot pore-pressure transmission production payment
paraffinic hydrocarbon pickle porosimeter production penalty
paraformaldehyde pickling fluid porosity production period
parallel fold pickup porosity exponent production service contract
parallel resistivity pick-up porosity unit production sharing contract
parameter pig porous production string
parametric pig run porous medium production tree
parasequence pigging porous plate technique production tubing
parasequence boundary pill portland cement production wing
parasequence set pilot mill portland cement clinker productivity index (PI)
PARCOM pilot test positive displacement motor productivity test
partial completion pilot-operated regulator positive displacement pump profile
partial penetration pin positive-displacement pump profile modification
participating interest pinch out