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


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


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


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


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


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


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


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


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


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


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 blocking long spacing sonic log
lag least time path liquid desiccant longitudinal plot
lag gas least-time path liquid hydrocarbons longitudinal relaxation
lag time leonardite liquid saturation method long-path multiple
Lamé constant lessor royalty liquid-junction potential long-spacing sonic log
laminar flow levelwind listric fault loose emulsion
laminated sand LGS lithification lost circulation
lamination licensing round lithofacies lost circulation material
landing collar life of the well lithologic lost returns
landing nipple lifting frame lithologic contact lost-circulation material
LAO lifting sub lithology LOT
Laplace equation light crude oil lithosphere Love wave
laser diffraction light hydrocarbons lithostatic pressure low colloid oil mud
last reading light pipe lithostratigraphic low gravity solids
late time transient data lignin lithostratigraphic inversion low solids mud
lateral lignite lithostratigraphy low solids nondispersed mud
late-time transient data lignosulfonate live cement low specific gravity solids
latex lime mud live oil low velocity layer
layer limestone LNG low yield clay
layer cake geometry limestone compatible scale LNGC low-colloid oil mud
layer stripping limestone porosity unit load cell low-gravity solids
layer-cake geometry limestone-compatible scale load oil low-pressure, low-temperature filtration test
layered reservoir testing limited entry local content low-salinity waterflooding
lb/bbl line drive local holdup low-solids mud
lbm/bbl line source solution local magnetic interference low-solids, nondispersed mud
LC50 lineament local probe low-specific-gravity solids
LCM linear alphaolefin lock lowstand systems tract
lead acetate test linear flow lock mandrel low-velocity layer
lead cement liner lock-up low-yield clay
leak detection liner hanger log LPG
leak off liner patch logarithmic mean LS
leakoff line-source solution logging lubricant
leakoff test lip seal logging run lubricator
leaky mode lipophilic logging tool LWD
lean gas liquefied natural gas logging unit lyophilic
lean gas condensate liquefied natural gas carrier logging while drilling lyophilic colloid
lean glycol liquefied petroleum gas logging-while-drilling lyophobic
lean oil liquid additive long path multiple 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 induction mis tie mud filtrate
magnetic permeability membrane potential miscible mud hopper
magnetic resonance memory gauge miscible displacement mud house
magnetic reversal sequence meniscus missile mud in
magnetic toolface mercury displacement method mist mud in sample
magnetic total field metagenesis mist drilling mud motor
magnetic-flux leakage metal gain mist extractor mud out
magnetics metal loss mist flow mud out sample
magnetotelluric method metamorphic mis-tie mud oven
main magnetic field metamorphism mixed deposits mud pit
make a connection meter calibration mixed metal hydroxide mud program
make hole meter capacity mixed metal silicate mud pulse telemetry
make up meter factor mixed-metal hydroxide mud report
make up water meter slippage mixed-metal silicate mud retort
makeup cathead methane MMC mud return line
makeup gas methane hydrate MME mud scale
makeup tongs methyl orange MMH mud still
make-up water methyl orange alkalinity MMS mud tracer
managed pressure drilling methylene blue dye mobile offshore drilling unit mud up
mandrel methylene blue test mobility mud weight
manifold methylglucoside drilling fluid mobility buffer mud-aging cell
mantle mica mobility control mudcake
map micellar polymer flooding mobility ratio mudding off
marginal well micellar-polymer flooding model mudding up
marine drilling riser micelle modified isochronal test mud-in sample
marine flooding surface micrite MODU mud-out sample
marker bed microannulus modulus of compression mudrock
marker joint microbial enhanced oil recovery modulus of elasticity Multiazimuth towed-streamer acquisition
marketing agreement microcylindrical log modulus of rigidity multi-capacitance flowmeter
marl microemulsion Moho multicomponent seismic data
Marsh funnel microgel Mohorovicic discontinuity multifinger caliper
Marsh funnel viscosity microlaterolog moldic porosity multilateral
mass balance microlog moment multipass method
massif micropaleontology monkey board multiphase
mast microporosity monkeyboard multiphase flow
mast unit microresistivity monopole multiphase fluid
master valve microseismic monitoring Monte Carlo risk analysis multiphase fluid flow
material balance microspherical log Monte Carlo sampling multiphase holdup log
material balance equation middle time transient data Monte Carlo simulation multiphase meter
material-balance equation middle-time transient data montmorillonite multiphase pump
matrix midoceanic ridge monument multiple completion
matrix acidizing midpoint morning tour multiple isotope log
matrix stimulation migrate mosquito bill multiple rate tests
maturation migration motorman multiple reflection
maturity Milankovitch cycles mousehole multiple regression
maximum flooding surface milk emulsion mud moveable hydrocarbons multiple salinity
maximum recorded temperature mill moved hydrocarbons multiple-contact miscibility
maximum treating pressure mill out moveout multiple-isotope log
maximum working pressure (MWP) mill shoe moving-source method multiple-rate tests
Maxwell's equations milligrams per kilogram MPD multishot survey
MBT test milligrams per liter mpy multiwell pad
MD milling MRS mute
mean million standard cubic feet MSDS mutual solvent
measure point mils per year penetration MSE MWD
measured depth mineral MT mysid shrimp
measurement after drilling mineral interest mud


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


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


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


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


R signal red mud reservoir modeling rig up
Rwa redox reservoir pressure right angle set
rabbit reduced water slurry reservoir quality (RQ) right of first refusal
racking back pipe reduced-water slurry reservoir simulation right-angle set
radial array reducing agent reservoir-drive mechanisms rigless operation
radial differential temperature log reef residence time RIH
radial differential-temperature log reefal residual bend ring resistivity
radial faulting reel residual oil ringworm corrosion
radial processing reel back tension residual oil saturation rising-bubble apparatus
radial refraction reel back-tension resin RM
radial resolution reeled tubing resistive invasion rock
radial response reference point resistivity rock mechanics
radio safe detonator reflection resistivity index rock properties
radio silence reflection coefficient resistivity log