Oilfield Glossary
Oilfield Glossary
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Variables and Numbers

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


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


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


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


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


fabric fines flow profile forward modeling
facies fines migration flow regime forward multiple-contact test
facies modeling fingerboard flow simulation forward problem
fairway fingering flow stream fossil
fall off test finite conductivity fracture flow structure four component seismic data
falloff test finite wellbore solution flow unit four dimensional seismic data
fan shooting finite-conductivity fracture flow-after-flow tests four-component seismic data
Fann viscometer finite-wellbore solution flowback four-dimensional seismic data
far water fire flooding flow-concentrating Fourier analysis
farmee fireflooding flower structure Fourier synthesis
farmor firing head flowing neutron log Fourier transform
farmout first arrival flowing pressure Fourier transform infrared spectroscopy
fast diffusion first break flowing well FPSO
fast formation first reading flowline frac balls
fast formation arrival first-contact miscibility flowline manifold frac crew
fast Fourier transform fish flowline mud sample frac fluid
fast neutron reaction fish eye flowline sample frac gel
fast-formation arrival fishbone wells flowmeter frac gradient
fast-neutron reaction fishing flowstream frac gun
fatty acid fishing bell flowstream sample frac head
fatty acid soap fishing diagram flue gas frac iron
fatty-acid soap fishing neck fluid compatibility test frac job
fault fishing tool fluid compressibility frac manifold
fault trap fitted variogram fluid contact frac pump
Faye correction fitting fluid density log frac stack
FD five spot fluid flow frac tree
fee simple interest five-spot fluid interface log frac valve
fee-simple interest fixed choke fluid invasion fractal
feldspar fixed source method fluid level fractal analysis
felsic fixed-cutter bit fluid loss fractal networks
fence diagram fixed-source method fluid loss control fracture
Fermat's principle f-k domain fluid loss control material fracture acidizing
ferro-chrome lignosulfonate f-k plot fluid pound fracture conductivity
ferrous sulfide flag fluid tester fracture gradient
FFT flag joint fluid-density log fracture half-length
fiber LCM flake LCM fluid-friction reducer fracture networks
fiber lost circulation material flake lost circulation material fluid-interface log fracture permeability
fiber lost-circulation material flake lost-circulation material fluid-loss additive fracture porosity
field flange fluid-loss control fractured well analysis
field tape flange up fluid-loss-control material fractured-well analysis
field weld flapper valve fluoboric acid fracturing fluid
fill cement flare fluoroscopy fracturing mandrel
fill sub flare gas flush joint fracturing manifold
film forming amine flash point flush production fracturing pressure
film-forming amine flat gels flushed zone fracturing sleeve
filter flattened section flushed zone water saturation free air correction
filter cake flexural mode flushed-zone water saturation free fluid
filter cake quality FLNG fluvial free gas
filter cake thickness float collar flux leakage free induction decay
filter cell float joint fly ash free point
filter loss float shoe foam breaker free point indicator
filter media 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


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


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 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 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
lb/bbl lineament local magnetic interference low-specific-gravity solids
lbm/bbl linear alphaolefin local probe lowstand systems tract
LC50 linear flow lock low-velocity layer
LCM liner lock mandrel low-yield clay
lead acetate test liner hanger lock-up LPG
lead cement liner patch log LS
leak detection line-source solution logarithmic mean lubricant
leak off lip seal logging lubricator
leakoff lipophilic logging run lubricator valve
leakoff test liquefied natural gas logging tool lubricity
leaky mode liquefied natural gas carrier logging unit LWD
lean gas liquefied petroleum gas logging while drilling lyophilic
lean gas condensate liquid additive logging-while-drilling lyophilic colloid
lean glycol liquid blocking long path multiple lyophobic
lean oil 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 mixed-metal hydroxide mud report
make up meter calibration mixed-metal silicate mud retort
make up water meter capacity MMC mud return line
makeup cathead meter difference MME mud scale
makeup gas meter factor MMH mud still
makeup tongs meter slippage MMS mud tracer
make-up water methane MMscf mud up
managed pressure drilling methane hydrate mobile offshore drilling unit mud weight
mandrel methyl orange mobility mud-aging cell
manifold methyl orange alkalinity mobility buffer mudcake
mantle methylene blue dye mobility control mudding off
map methylene blue test mobility ratio mudding up
marginal well methylglucoside drilling fluid model mud-in sample
marine mica modeling mud-out sample
marine drilling riser micellar polymer flooding modified isochronal test mudrock
marine flooding surface micellar-polymer flooding MODU Multiazimuth towed-streamer acquisition
marker bed micelle modulus of compression multi-capacitance flowmeter
marker joint micrite modulus of elasticity multicomponent seismic data
marketing agreement microannulus modulus of rigidity multifinger caliper
marl microbial enhanced oil recovery Moho multilateral
marsh microcylindrical log Mohorovicic discontinuity multipass method
Marsh funnel microemulsion moldic porosity multiphase
Marsh funnel viscosity microgel moment multiphase flow
mass balance microlaterolog monkey board multiphase fluid
massif microlog monkeyboard multiphase fluid flow
mast micropaleontology monomer multiphase holdup log
mast unit microporosity monopole multiphase meter
master valve microresistivity Monte Carlo risk analysis multiphase pump
material balance microseismic monitoring Monte Carlo sampling multiple completion
material balance equation microspherical log Monte Carlo simulation multiple isotope log
Material Safety Data Sheet middle time transient data montmorillonite multiple isotope spectroscopy
material-balance equation middle-time transient data monument multiple rate tests
matrix midoceanic ridge moon pool multiple reflection
matrix acidizing midpoint morning tour multiple regression
matrix stimulation midrange mosquito bill multiple salinity
maturation migrate motorman multiple service contract
maturity migration mousehole multiple-contact miscibility
maximum flooding surface Milankovitch cycles moveable hydrocarbons multiple-isotope log
maximum recorded temperature milk emulsion mud moved hydrocarbons multiple-isotope spectroscopy
maximum treating pressure mill moveout multiple-rate tests
maximum working pressure (MWP) mill out moving-source method multishot survey
Maxwell's equations mill shoe MPD multiwell pad
MBT test milligrams per kilogram mpy mute
MD milligrams per liter MRS mutual solvent
mean milling Mscf/d MWD
measure point million standard cubic feet MSDS My
measured depth mils per year penetration MSE MYBP
measurement after drilling mineral MT mysid shrimp
measurement error mineral interest mud


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


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


p rate perpendicular offset polarization horn pressure-composition diagram
p wave perpendicular resistivity polarization time pressure-drawdown analysis
P&A petal basket flowmeter polished joint pressure-squared plot
Pf petrographic polished rod pressure-transient analysis
Pm petrography polyacrylamide pressure-transient well tests
PAC petroleum polyacrylate pressurized mud balance
pack off petroleum system polyalkalene glycol primary cementing
packer petroleum systems modeling polyalphaolefin primary completion components
packer flowmeter petrologic polyanionic cellulose primary migration
packer fluid petrology polyanionic lignin primary porosity
packing petrophysical model polycrystalline diamond compact bit primary production
packing gland petrophysical rock type polyelectrolyte primary recovery
packoff pH polyglycerol primary recovery method
pad pH test polymer primary reflection
paddle blender phantom polymer flooding primary term
paddle mixer phase polymer plug prime mover
PAG phase redistribution polyol primer cord
paid up lease phase shift polyolefin principal axis
paid-up lease phase shift resistivity polyphosphates principal component analysis
pair production phase velocity polysaccharide probability
paleontology phase velocity log pony rod probe
paludal phase-shift resistivity POOH processing
palustrine phase-velocity log pooling produced fluid
palynology phenolphthalein poppet valve produced water
PAO phosphate salt pore producing formation
paraffin photoelectric effect pore gas producing well
paraffin base crude oil photon log pore pressure production
paraffin control PHPA pore pressure gradient production bonus
paraffin inhibitor PHPA mud pore pressure transmission production casing
paraffin scraper PI pore throat production log
paraffin scratcher pick pore-pressure gradient production packer
paraffin-base crude oil Pickett plot pore-pressure transmission production payment
paraffinic hydrocarbon pickle porosimeter production penalty
paraformaldehyde pickling fluid porosity production period
parallel fold pickup porosity exponent production service contract
parallel resistivity pick-up porosity unit production sharing contract
parameter pig porous production string
parametric pig run porous medium production tree
parasequence pigging porous plate technique production tubing
parasequence boundary pill portland cement production wing
parasequence set pilot mill portland cement clinker productivity index (PI)
PARCOM pilot test positive displacement motor productivity test
partial completion pilot-operated regulator positive displacement pump profile
partial penetration pin positive-displacement pump profile modification
participating interest pinch out post profile testing
particle plugging apparatus pinch-out post mature profiling
particle size distribution pinion shaft post-mature profit oil
particle-plugging apparatus pipe dope potassium progradation
particle-plugging test pipe heavy potassium ion progressive cavity pumping system
particle-size distribution pipe light potassium mud progressive gels
partitioning pipe rack potential field propagation constant
parts per billion pipe ram pounds per barrel propagation resistivity
parts per million pipe stretch pour point propagation resistivity measurement
party pipe trip power fluid injection rate propagation time
party chief pipeline power law fluid proppant
party manager pipeline capacity power oil propylene glycol normal propyl ether
pascal pipeline gas power-fluid injection rate prorated well
pass pipeline oil power-law fluid proration unit
passive margin pipeline patrol pozzolan prospect
patch piston effect pozzolanic proximity log
pay PIT PPA pseudogeometrical factor
payout pitch-and-lead ppb pseudoplastic
PDC bit Pitot tube ppg pseudopressure plot
PDM pitting ppm pseudostatic spontaneous potential
peak plane table PPT pseudosteady state
peak shaving plane wave p-rate PSP
PEF plankton precipitate