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


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


C pump cement retarder coarse contingency plan
cable cement squeeze coating continuous gas lift
cable head cementation coating flaw continuous phase
cable-tool drilling cementation exponent COD continuous reservoir
cake cementer coding contour
cake thickness cementing COFCAW contour interval
calcite cementing engineer cogeneration contour map
calcium bromide cementing plug coherence contract depth
calcium carbonate centipoise coherence filtering control line
calcium carbonate plug centralizer coherence map control valve
calcium chloride centrifugal pump coherence vector map controlled time survey
calcium contamination centrifuge coherent controller
calcium hydroxide CERCLA coherent detection convection
calcium mud cesium acetate coherent noise conventional mud
calcium naphthenate cesium formate coiled tubing conventional reservoir
calcium oxide chain tongs coiled tubing completion convergence
calcium sulfate chalk coiled tubing connector convergent
calcium test channel coiled tubing drilling converted wave
calibration channel wave coiled tubing string conveyance
caliche channeling coiled tubing unit convolution
caliper log character coke convolve
camera charged zone cokriging copolymer
cap Charpy test cold heavy oil production with sand copper carbonate
cap rock check shot survey cold production core
cap the well check valve collapse pressure core analysis
capacitance log check-shot survey 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 rate
casing gun circulation sub compensated neutron log critical reflection
casing hanger circulation system compensated-density log crooked hole
casing hardware circulation time competent crop out
casing head circulation valve complete a well cross dipole
casing inspection log citric acid completion cross over
casing joint city gate completion fluid cross section
casing patch classical reservoir modeling completion quality (CQ) crosscorrelate
casing point clastic intrusion completion skin crosscorrelation
casing potential profile clastic sediment complex trace analysis crosscorrelation flowmeter
casing pressure clathrate complex-trace analysis crossflow
casing reciprocation clay composite frac tree crossline
casing roller clay bound water composite log crosslinker
casing scraper clay extender composite stream crossover
casing shoe clay stabilizer compositional fluid analysis crossover service tool
casing shoe test clay swelling compressibility crossplot
casing spool clay water interaction compression ratio crossplot porosity
casing string clay-bound water compressional wave cross-sectional
casing swage clay-water interaction compression-set packer crosswell electromagnetic tomography
casing test clean compressor crosswell reflection tomography
casing thread clean out compressor plant crosswell seismic tomography
casing valve cleanout Compton scattering crosswell tomography
casinghead cleanup computed tomography crown block
casing-inspection log clear brine concentric crown valve
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
cathode closed mud system condensed section CT
cathodic protection closed-chamber testing condensing drive cubic packing
cation closed-in well conditional simulation cultural anomaly
cation exchange capacity close-in conductance cultural noise
cation-exchange capacity closing unit conductive invasion cumulative production
cationic closure conductive rock matrix model curing
catline closure pressure conductivity curve
catwalk cloud point conductometric titration curve fitting
caustic extraction test cloud point glycol conductor pipe curve matching
caustic potash cluster conformable cushion
caustic soda cluster analysis conformity cut
cave effect CMC conical projection cut and thread fishing technique
cavings CMC-Hi Vis coning cut oil
cavitation CMC-HVT connate water cut point
CBM CMC-Lo Vis connection cut-and-thread fishing technique
CDP CMC-LVT connection gas Cutt point
CEC CMHEC consistency cuttings
cellar CMP consistometer cuttings lifting
cellulosic polymer CMS consolidated CWA
cement CO2 injection consolidation cycle condensate
cement accelerator coal constant composition expansion cycle gas
cement additive coal bed methane constant rate cycle skip
cement bond log coal gasification contact cycle time
cement dispersant coal seam gas contact angle cyclic steam injection
cement evaluation log coalbed methane contact time cycling plant
cement extender coal-bed methane contaminant cyclothem
cement head coalesce contamination gas cylinder
cement plug coalescence continental shelf cylinder operator
cement retainer coal-seam gas


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


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


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


H2S HF horizon hydraulic fracturing
hade HGS horizon slice hydraulic head
haematite HHP horizontal drilling hydraulic horsepower
halite hiatal horizontal resistivity hydraulic packer
halo effect hiatus horizontal separator hydraulic power pack
hammer union hierarchical cluster analysis horizontal severance hydraulic power unit
hangoff high explosive horizontal transverse isotropy hydraulic pumping
hard rock high pressure squeeze horizontal tree hydraulic release tool
hard water 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 humidity meter hydrophone
hectorite holdup meter humping hydrostatic bailer
held by production hole cleaning HWDP hydrostatic head
hematite hollow carrier gun hybrid scale hydrostatic pressure
Herschel Bulkley fluid homogeneity hydrate hydrothermal
Herschel-Bulkley fluid homogeneous hydration hydrothermal alteration
hertz homogeneous formation hydraulic bypass hydroxyethyl starch
hesitation squeeze hook hydraulic cement hydroxyethylcellulose
heterogeneity hook load hydraulic centralizer hydroxypropyl starch
heterogeneous hookwall packer hydraulic disconnect hygrometer
heterogeneous formation hopper hydraulic fracture monitoring hygroscopic


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


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


m measurement range mineralogy mud acid
Mf measurements while drilling Minerals Management Service mud additive
Ma measurements-while-drilling minifrac mud aging cell
mafic measuring tank minimum miscibility concentration mud anchor
magma mechanical diversion minimum miscibility enrichment mud balance
magnesium test mechanical jar minimum miscibility pressure mud cell
magnetic constant mechanical skin minimum restriction mud cleaner
magnetic field mechanical specific energy minimum time path mud cup
magnetic flux leakage mechanical sticking minimum-time path mud density
magnetic mud median minute mark mud engineer
magnetic particle inspection (MPI) medium mis tie mud filtrate
magnetic permeability medium induction miscible mud hopper
magnetic resonance membrane potential miscible displacement mud house
magnetic reversal sequence memory gauge missile mud in
magnetic toolface meniscus mist mud in sample
magnetic total field mercury displacement method mist drilling mud motor
magnetic-flux leakage metagenesis mist extractor mud out
magnetics metal gain mist flow mud out sample
magnetometer metal loss mis-tie mud oven
magnetotelluric method metal-to-metal seal mixed deposits mud pit
main magnetic field metamorphic mixed metal hydroxide mud program
make a connection metamorphism mixed metal silicate mud pulse telemetry
make hole meter calibration mixed-metal hydroxide mud report
make up meter capacity mixed-metal silicate mud retort
make up water meter difference 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 mobile offshore drilling unit mud up
managed pressure drilling methyl orange mobility mud weight
mandrel methyl orange alkalinity mobility buffer mud-aging cell
manifold methylene blue dye mobility control mudcake
mantle methylene blue test mobility ratio mudding off
map methylglucoside drilling fluid model mudding up
marginal well mica modeling 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


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