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 acrylate polymer amplitude variation with offset and azimuth areal displacement efficiency
API Recommended Practice 10B Recommended Practice for Testing Well Cements activation log AMPS areal sweep efficiency
API Specification 10A – Specification for Cements and Materials for Well Cementing active margin anaerobic arenaceous
abandonment costs active sulfide analog argillaceous
abnormal events activity of aqueous solutions anchor pin arithmetic mean
abnormal pressure acyclic compound angle of approach armor
abrasion test adapter spool angle of incidence aromatic content test
abrasive jetting additivity angle valve aromatic hydrocarbon
absolute age adhesion tension angular dispersion array
absolute filter adjacent bed angular unconformity array induction
absolute open flow potential adjustable choke anhydrite array laterolog
absolute permeability 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
acrylamido-methyl-propane sulfonate polymer amplitude variation with offset area open to flow


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


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


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


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


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


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


H2S HGS horizon slice hydraulic head
hade HHP horizontal drilling hydraulic horsepower
haematite hiatal horizontal resistivity hydraulic packer
halite hiatus horizontal separator hydraulic power pack
halo effect hierarchical cluster analysis horizontal severance hydraulic power unit
hammer union high explosive horizontal transverse isotropy hydraulic pumping
hangoff high pressure squeeze horizontal tree hydraulic release tool
hard rock high shot density gun Horner slope hydraulic set
hard water high side toolface horst hydraulic-set
hardbanding high temperature completions hostile environment hydrocarbon
hardfacing high-gravity solids hot lime hydrocarbon indicator
hardground high-pressure air injection hot oiler hydrocarbon kitchen
hardness ion high-pressure manifold hot oiling hydrochloric acid
harmonic high-pressure squeeze hot tapping hydrocyclone
harmonic distortion 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
HF horizon hydraulic fracturing


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


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


lacustrine lease liquid hydrocarbons long spacing sonic log
lag least time path liquid level longitudinal plot
lag gas least-time path liquid saturation method longitudinal relaxation
lag time leonardite liquid-junction potential long-path multiple
Lamé constant lessor royalty listric fault long-spacing sonic log
laminar flow levelwind lithification loose emulsion
laminated sand LGS lithofacies lost circulation
lamination licensing round lithologic lost circulation material
landing collar life of the well lithologic contact lost returns
landing nipple lifting frame lithology lost-circulation material
LAO lifting sub lithosphere LOT
Laplace equation light crude oil lithostatic pressure Love wave
laser diffraction light hydrocarbons lithostratigraphic low colloid oil mud
last reading light pipe lithostratigraphic inversion low gravity solids
last-shot detection lignin lithostratigraphy low solids mud
late time transient data lignite littoral low specific gravity solids
lateral lignosulfonate live cement low velocity layer
late-time transient data lime mud live oil low yield clay
latex limestone LNG low-colloid oil mud
layer limestone compatible scale LNGC low-gravity solids
layer cake geometry limestone porosity unit 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 lyophobic
lean glycol liquid blocking long path multiple lyophobic colloid
lean oil liquid desiccant


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


n neat cement nipple down nondipole field
NACE needle valve nipple up nonhydrocarbon contaminants
naphthene base crude oil neritic nipple-down nonideal gas
naphthene-base crude oil nest nipple-up non-Newtonian fluid
naphthenic hydrocarbon nested fractal structures nitrified fluid nonparticipating royalty
Narrow-azimuth seismic data net gas production nitrogen cushion nonparticipating royalty interest
native clay net oil production nitrogen injection nonrising stem
native solids mud net revenue interest nitrogen kickoff normal
native state core neural networks nitrogen lift normal fault
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 log noise log nuclear fluid densimeter
naturally flowing well neutron porosity nominal filter nuclear magnetic resonance
naturally occurring radioactive materials (NORM) neutron-activation log nonconductive drilling fluid nuclear magnetic resonance measurement
nautical mile Newtonian fluid nonconformity numerical methods
near surface correction NGL non-Darcy flow numerical model
near-surface correction nipple nondestructive examination (NDE) numerical reservoir simulation


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


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