- 1C – Proved Contingent Resources
- 1P – Proven reserves
- 2C – Proved and probable Contingent Resources
- 2D – two-dimensional (geophysics)
- 2P – proved and probable reserves
- 3C – three components seismic acquisition (x,y and z)
- 3C – Proved, probable and possible Contingent Resources
- 3D – three-dimensional (geophysics)
- 3P – proved, probable and possible reserves
- 4D – multiple 3Ds acquired over time (the 4th D) over the same area with the same parameters (geophysics)
- 8rd – eight round (describes the number of revolutions per inch of pipe thread)
A
- A – Appraisal (well)
- AADE – American Association of Drilling Engineers
- AAPG – American Association of Petroleum Geologists
- AAPL – American Association of Professional Landmen
- AAODC – American Association of Oilwell Drilling Contractors (obsolete; superseded by IADC)
- AAV – Annulus Access Valve
- ABAN – Abandonment, (also as AB and ABD)
- ABSA – Alberta Boilers Safety Association
- ACHE – Air-Cooled Heat Exchanger
- ACOU – Acoustic
- ACQU – Acquisition log
- ADE - Advanced Decision Making Environment
- ADEP – Awaiting Development with Exploration Potential, referring to an asset
- ADROC – advanced rock properties report
- ADT – Applied Drilling Technology, ADT log
- AFE – Authorization For Expenditure, a process of submitting a business proposal to investors
- AFP – Active Fire Protection
- AGRU – acid gas removal unit
- AHBDF – along hole (depth) below Derrick floor
- AHD – along hole depth
- AHU – Air Handling Unit
- AICD – autonomous inflow control device
- AIR – Assurance Interface and Risk
- AIRG – airgun
- AIRRE – airgun report
- AIT – array induction tool
- AL – appraisal license (United Kingdom), a type of onshore licence issued before 1996
- ALAP – as low as possible (used along with density of mud)
- ALARP – as low as reasonably practicable
- ALC – aertical seismic profile acoustic log calibration report
- ALQ – Additional Living Quarters
- ALR – acoustic log report
- aMDEA – activated methyldiethanolamine
- AMS – auxiliary measurement service log; Auxiliary Measurement Sonde (temperature)
- AMSL – above mean sea level
- AMI – area of mutal interest
- AMV – annulus master valve[3]
- ANACO – analysis of core logs report
- ANARE – analysis report
- AOF – absolute open flow
- AOFP – absolute open-flow potential
- AOL – Arrive on location
- APD – application for permit to drill
- API – American Petroleum Institute: organization which sets unit standards in the oil and gas industry
- APPRE – appraisal report
- APS – active pipe support
- APWD – annular pressure while drilling (tool)
- ARESV – analysis of reservoir
- ARI – azimuthal resistivity image
- ARRC – array acoustic report
- ART – actuator running tool
- AS – array sonic processing log
- ASI – ASI log
- ASME – American Society of Mechanical Engineers
- ASP – array sonic processing report
- ASP – Alkali-Surfactant-Polymer
- ASTM – American Society for Testing and Materials
- ASCSSV – annulus surface controlled sub-surface valve[3]
- ASV – Anti Surge Valve
- ASV – Annular Safety Valve
- ASV – Accommodation and Support Vessel
- ATD – application to drill
- ATU - Auto Top-up Unit
- AUV – authonomus underwater vehicle
- AV – annular velocity or apparent viscosity
- AVGMS – Annulus Vent Gas Monitoring System
- AVO – amplitude versus offset (geophysics)
- AWB/V – annulus wing block/valve (XT)
- AWO – approval for well operation
- ATM – at the moment
B
- B or b – prefix denoting a number in billions
- BA – Bottom Assembly (of a riser)
- bbl – barrel
- BBG – Buy Back Gas
- BBSM – behaviour-based safety management
- BCPD – barrels condensate per day
- Bcf – billion cubic feet (of natural gas)
- Bcfe – billion cubic feet (of natural gas equivalent)
- BDF – below derrick floor
- BDL – bit data log
- BDV – blowdown valve
- BGL – borehole geometry log
- BGL – below ground level (used as a datum for depths in a well)
- BGS – British Geological Survey
- BGT – borehole geometry tool
- BGWP – base of ground-water protection
- BH – bloodhound
- BHA – bottom hole assembly (toolstring on coiled tubing or drill pipe)
- BHC – BHC gamma ray log
- BHCA – BHC acoustic log
- BHCS – BHC sonic log
- BHCT – bottomhole circulating temperature
- BHL – borehole log
- BHP – bottom hole pressure
- BHPRP – borehole pressure report
- BHSRE – bottom hole sampling report
- BHSS – borehole seismic survey
- BHT – bottomhole temperature
- BHTV – borehole television report
- BINXQ – bond index quicklook log
- BIOR – biostratigraphic range log
- BIORE – biostratigraphy study report
- BIVDL – BI/DK/WF/Casing collar locator/gamma ray log
- BLI – bottom of logging interval
- BO – back-off log
- boe – barrel(s) of oil equivalent
- boed – barrel(s) of oil equivalent per day
- BOEM – Bureau of Ocean Energy Management
- boepd – barrel(s) of oil equivalent per day
- BOB – back on bottom
- BOD – Biological Oxygen Demand
- BOM – bill of materials
- BOP – blowout preventer
- BOP – bottom of pipe
- BOPD – barrel(s) of oil per day
- BOPE – blowout prevention equipment
- BOREH – borehole seismic analysis
- BOSIET – basic offshore safety induction and emergency training
- BOTHL – bottom hole locator log
- BOTTO – bottom hole pressure/temperature report
- BP – bridge plug
- BPD – barrels per day
- BPH – barrels per hour
- BPFL – borehole profile log
- BPLUG – baker plug
- BPV – back pressure valve (goes on the end of coiled tubing a drill pipe tool strings to prevent fluid flow in the wrong direction)
- BQL – B/QL log
- BRPLG – bridge plug log
- BRT – below rotary table (used as a datum for depths in a well)
- BS – Bend Stiffener
- BS – bumper sub
- BS – Booster Station
- BSEE – US: Bureau of Safety and Environmental Enforcement[4] (formerly the MMS)
- BSG – Black Start Generator
- BSR – blind shear rams (blowout preventer)
- BSML – below sea mean level
- BS&W – basic sediments and water
- BT – buoyancy tank
- BTEX – benzene, toluene, ethyl-benzene and xylene
- BTHL – bottom hole log
- BTO/C – break to open/close (valve torque)
- BTU – British thermal units
- BU – bottom up
- BUL – bottom up lag
- BUR – build-up rate
- BVO – ball valve operator
- bwd – barrels of water per day (often used in reference to oil production)
- bwpd – barrels of water per day
C
- C&E – well completion and equipment cost
- C&S – cased and suspended
- C1 – methane
- C2 – ethane
- C3 – propane
- C4 – butane
- C6 – hexanes
- C7+ – heavy hydrocarbon components
- CA – core analysis log
- CALI – calliper log
- CALOG – circumferential acoustic log
- CALVE – calibrated velocity log data
- CAODC – Canadian Association of Oilwell Drilling Contractors
- CAPP – Canadian Association of Petroleum Producers
- CART – cam-actuated running tool (housing running tool)
- CART – Cap Replacement Tool
- CAS – casing log
- CAT – Connector Actuating Tool
- CB – core barrel
- CBIL – CBIL log
- CBL – cement bond log (measurement of casing cement integrity)
- CBM – choke bridge module – XT choke
- CBM – conventional buoy mooring
- CBM – coal-bed methane
- CCHT – core chart log
- CCL – casing collar locator (in perforation or completion operations, the tool provides depths by correlation of the casing string's magnetic anomaly with known casing features)
- CCLBD Construction / Commissioning Logic Block Diagram
- CCLP – casing collar locator perforation
- CCLTP – casing collar locator through tubing plug
- CD – core description
- CDATA – core data
- CDIS – CDI synthetic seismic log
- CDU – control distribution unit
- CDU – crude distillation unit
- CDP – common depth point (geophysics)
- CDP – comprehensive drilling plan
- CDRCL – compensated dual resistivity cal. log
- CDFT – critical device function test
- CE – CE log
- CERE – cement remedial log
- CECAN – CEC analysis
- CEME – cement evaluation
- CET – cement evaluation tool
- CF – completion fluid
- CFD – computational fluid dynamics
- CGEL – CG EL log
- CGL – core gamma log
- CGPH – core graph log
- CGR – condensate gas ratio
- CGTL – compact gas to liquids (production equipment small enough to fit on a ship)
- CHCNC – CHCNC gamma ray casing collar locator
- CHDTP – calliper HDT playback log
- CHECK – checkshot and acoustic calibration report
- CHESM – contractor, health, environment and safety management
- CHKSR – checkshot survey report
- CHKSS – checkshot survey log
- CHOPS – Cold Heavy Oil Production with Sand
- CHP – casing hanger pressure (pressure in an annulus as measured at the casing hanger)
- CHOTO - Commissioning, Handover & Takeover
- CHROM – chromatolog
- CHRT – casing hanger running tool
- CIBP – cast iron bridge plug
- CIDL – chemical injection downhole lower
- CIDU – chemical injection downhole upper
- CIL – chemical injection line
- CILD – conduction log
- CIMV – chemical injection metering valve
- CIRC – CIRCULATION
- CITHP – closed-in tubing head pressure (tubing head pressure when the well is shut in)
- CIV – chemical injection valve
- CL – core log
- CLG – core log and graph
- CM – choke module
- CMC – crown mounted compensators
- CMP – common midpoint (geophysics)
- CMR – Combinable Magnetic Resonance (NMR log tool)
- CND – compensated neutron density
- CNFDP – CNFD true vertical-depth playback log
- CNGR – compensated neutron gamma-ray log
- CNL – compensated neutron log
- CNLFD – CNL/FDC log
- CNS – Central North Sea
- CNCF – field-normalised compensated neutron porosity
- CNR – Canadian Natural Resoures
- CO – change out (ex. from rod equipment to casing equipment)
- COA – Conditions of Approval
- COC – Certificate of Conformance
- COD – Chemical Oxygen Demand
- COL – collar log
- COMAN – compositional analysis
- COML – compaction log
- COMP – composite log
- COMPR – completion program report
- COMPU – computest report
- COMRE – completion record log
- CONDE – condensate analysis report
- CONDR – continuous directional log
- CORAN – core analysis report
- CORE – core report
- CORG – corgun log
- CORIB – coriband log
- CORLG – correlation log
- COROR – core orientation report
- COW – Control of Work
- COXY – carbon/oxygen log
- CP – Cathodic Protection
- cP – centiPoise (Viscosity unit of measurement)
- CPI separator – corrugated plate interceptor
- CPI – CPI log (computer-processed interpretation), CPI (corrugated plate interceptor)
- CPICB – CPI coriband log
- CPIRE – CPI report
- CRA – corrosion-resistant alloy
- CRET – cement retainer setting log
- CRP – control riser platform
- CRP – common/central reference point (subsea survey)
- CRT – Clamp Replacement tool
- CRT – Casing Running Tool
- CSE – Confined Space Entry
- CsF – Caesium formate (coincidentally also an acronym of the sole large-scale supplier of caesium formate brine, cabot specialty fluids.)
- CSG – Coal Seam Gas
- csg – casing
- CSHN – cased-hole neutron log
- CSI – Combinable Seismic Imager (VSP) log (Schlumberger)
- CSMT – core sampler tester log
- CSO – complete seal-off
- CSPG – Canadian Society of Petroleum Geologists
- CSR - Corporate Social Responsibility
- CST – Chronological Sample Taker log (Schlumberger)
- CSTAK – core sample taken log
- CSTRE – CST report
- CSU – Commissioning and Start Up
- CSUG – Canadian Society for Unconventional Gas
- CT – coiled tubing
- CTD – coiled tubing drilling
- CTCO – coiled tubing clean-out
- CTLF – coiled tubing lift frame
- CTLF – compensated tension lift frame
- CTOD – crack tip opening displacement
- CTP – Commissioning Test Procedure
- CTRAC – cement tracer log
- CUI – Corrosion Under Insulation
- CUT – cutter log
- CUTTD – cuttings description report
- CWOP – complete well on paper
- CWOR – completion work over riser
- X/O – X-Over,Cross Over
- CYBD – cyberbond log
- CYBLK – cyberlook log
- CYDIP – cyberdip log
- CYDN – cyberdon log
- CYPRO – cyberproducts log
D
- D - Development
- D&C – drilling and completions
- D&I - direction and inclinitation (MWD borehole deviation survey)
- DAC – dipole acoustic log
- DARCI – Darci log
- DAS - Data Acquisition System
- DAT – wellhead housing drill-ahead tool
- DAZD – dip and azimuth display
- DBB – double block and bleed
- DBP - drillable bridge plug
- DC – drill centre
- DC – drill collar(s)
- DCAL – dual caliper log
- DCC – Distance cross course
- DCS – Distributed Control System
- DD – directional driller or directional drilling
- DDC - daily drilling cost
- DDC - De-watering and Drying Contract
- DDBHC – DDBHC waveform log
- DDET – depth determination log
- DDM – Derrick drilling machine (a.k.a. top drive)
- DDNL – dual det. neutron life log
- DDPT – drill data plot log
- DDPU - Double drum pulling unit
- DEA - diethanol amine
- DECC – Department for Energy and Climate Change (UK)
- DECT – decay time
- DEFSU – definitive survey report
- DEH - Direct Electrical Heating
- DELTA – delta-T log
- DEN – density log
- DEPAN – deposit analysis report
- DEPC – depth control log
- DEPT – depth
- DESFL – deep induction SFL log
- DEV – development well,
- DEVLG – deviation log
- DEXP – D-exponent log
- DF – Derrick floor
- DFI – Design, Fabrication and Installation résumé
- DFIT - Diagnostic Fracture Injection Test
- DFR – drilling factual report
- DGP – dynamic geohistory plot (3D technique)
- DH – drilling history
- DHC – depositional history curve
- DHSV – downhole safety valve
- DHPG - downhole pressure gauge
- DHPTT – downhole pressure/temperature transducer
- DIBHC – DIS BHC log
- DIEGR – dielectric gamma ray log
- DIF – drill in fluids
- DIL – dual-induction log
- DILB – dual-induction BHC log
- DILL – dual-induction laterolog
- DILLS – dual-induction log-LSS
- DILSL – dual-induction log-SLS
- DIM – directional inertia mechanism
- DINT – dip interpretation
- DIP – dipmeter log
- DIPAR – dipole acoustic report
- DIPBH – dipmeter borehole log
- DIPFT – dipmeter fast log
- DIPLP – dip lithology pressure log
- DIPRE – dipmeter report
- DIPRM – dip removal log
- DIPSA – dipmeter soda log
- DIPSK – dipmeter stick log
- DIRS – directional survey log
- DIRSU – directional survey report
- DIS – DIS-SLS log
- DISFL – DISFL DBHC gamma ray log
- DISO – dual induction sonic log
- DL – development license (United Kingdom), a type of onshore license issued before 1996
- DLIST – dip-list log
- DLL – dual laterolog (deep and shallow resistivity)
- DLS – dog-leg severity (directional drilling)
- DM - dry mate
- DMA – dead-man anchor
- DMAS - dead-man auto-shear
- DMRP - Density - Magnetic Resonance Porosity (wireline tool)
- DMT - Down hole Monitoring Tool
- DNHO – downhole logging
- DOA – delegation of authority
- DOE – Department of Energy, United States
- DOWRE – downhole report
- DP – drill pipe
- DP – dynamic positioning
- DPDV – dynamically positioned drilling vessel
- DPL – dual propagation log
- DPLD – differential pressure levitated device (or vehicle)
- DPRES – dual propagation resistivity log
- DPT – deeper pool test,
- DQLC – dipmeter quality control log
- DR – dummy-run log
- DR – drilling report
- DRI – drift log
- DRL - Drilling
- DRLCT – drilling chart
- DRLOG – drilling log
- DRLPR – drilling proposal/progress report
- DRO – Discovered Resources Opportunities
- DRPG – drilling program report
- DRPRS – drilling pressure
- DRREP – drilling report
- DRYRE – drying report
- DS – Deviation survey, (also directional system)
- DSCAN – DSC analysis report
- DSI – dipole shear imager
- DSL - digital spectralog (Western Atlas)
- DSPT – cross-plots log
- DST – drill-stem test
- DSTG – DSTG log
- DSTL – drill-stem test log
- DSTND – dual-space thermal neutron density log
- DSTPB – drill-stem test true vertical depth playback log
- DSTR – drill-stem test report
- DSTRE – drill-stem test report
- DSTSM – drill-stem test summary report
- DSTW – drill-stem test job report/works
- DSU - drill spacing unit
- DSV – diving support vessel or drilling supervisor
- DTI – Department of Trade and Industry (UK) (obsolete; superseded by dBERR, which was then superseded by DECC)
- DTPB – CNT true vertical-depth playback log
- DTT – depth to time
- DVT - Differential Valve Tool (for cementing multiple stages)
- DWOP – drilling well on paper (a theoretical exercise conducted involving the service-provider managers)
- DWQL – dual-water quicklook log
- DWSS – dig-well seismic surface log
- DXC – DXC pressure pilot report
E
- E – Exploration
- E&A – Exploration and Appraisal
- E&I – Electrical and Instrumentation
- E&P – Exploration and Production
- EA – Exploration Asset
- EAGE – European Association of Geoscientists & Engineers
- ECD – Equivalent Circulating Density
- EDG/EDGE - Emergency Diesel Generator
- ECMS – Electrical Control and Monitoring System
- ECP – External Casing Packer
- ECRD – Electrically Controlled Release Device (for abandoning stuck wireline tool from cable)
- ECT - External Cantilevered Turret
- EDP – Exploration Drilling Program Report
- EDP – Emergency Disconnect Package
- EDR – Exploration Drilling Report
- EDR – Electronic Drilling Recorder
- EDS – Emergency Disconnection Sequence
- EEHA - Electrical Equipment for Hazardous Areas
- EFL – Electrical Flying Lead
- EFR – Engineering Factual Report
- EHT – Electric Heat Trace
- EGMBE – Ethylene Glycol Mono-Butyl Ether
- EHU - Electro-Hydraulic Unit
- EIA - Environmental Impact Assessment
- ELEC TECH - Electronics Technician (See also: ETech)
- ELT – Economic Limit Test
- EL – Electric Log
- EM – EMOP Log
- EMCS - Energy Management and Control Systems
- EMD – Equivalent Mud Density
- EMG – Equivalent Mud Gradient
- EMOP – EMOP Well Site Processing Log
- EMP – Electromagnetic Propagation Log
- EMS - Environment measurement sonde (wireline multi-caliper)
- EMW – Equivalent Mud Weight
- EN PI – Enhanced Productivity Index Log
- ENG – Engineering Log
- ENGF – Engineer Factual Report
- ENGPD – Engineering Porosity Data
- Eni – Ente Nazionale Idrocarburi S.p.A. (Italy)
- ENJ – Enerjet Log
- EOFL – End of Field Life
- EOR – Enhanced Oil Recovery
- EOT – End of Tubing
- EOW – End Of Well Report
- EPCM – Engineering Procurement Construction Management
- EPCU – Electrical Power Conditioning Unit
- EPIDORIS – Exploration and Production Integrated Drilling Operations and Reservoir Information System
- EPL – EPL Log
- EPLG – Epilog
- EPLPC – EPL-PCD-SGR Log
- EPS – Early Production System
- EPT – Electromagnetic Propagation
- EPU – Electrical Power Unit
- EPTNG – EPT-NGT Log
- EPV - Early Production Vessel
- ER(D) – Extended Reach (Drilling)
- ERT – Emergency Response Training
- ESD – Emergency Shut-Down
- ESHIA - Environmental, Social and Health Impact Assessment
- ESIA - Environmental and Social Impact Assessment
- ESP – Electric Submersible Pump
- ETAP – Eastern Trough Area Project
- ETD – External Turret Disconnectable
- ETECH – Electronics Technician (See also: Elec Tech)
- ETTD – Electromagnetic Thickness Test
- ETU – Electrical Test Unit
- EUE – External-upset-end (tubing connection)
- EUR – Estimated Ultimate Recovery
- EVARE – Evaluation Report
- EWMP - Earthworks/Electrical Works/Excavation Works Management Plan
- EWR – End Of Well Report
- EXL – or XL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (1986) and the Sixth (1992)
- EZSV – EZSV Log
F
- FAC – factual report
- FAC - first aid case
- FACHV – four-arm calliper log
- FANAL – formation analysis sheet log
- FAT – factory acceptance testing
- FBE – fusion-bonded epoxy
- FC – float collar
- FCGT - Flood Clean Gauge Test
- FCP – final circulating pressure
- FCV - Flow Control Valve
- FCVE – F-curve log
- FDC – formation density log
- FDP – Field Development Plan
- FDS – functional design specification
- FEED – front-end engineering design
- FER – field equipment room
- FEWD – formation evaluation while drilling
- FFAC – formation factor log
- FFM – full field model
- FG - Fiberglass
- FGHT - Flood Gauge Hydrotest
- FRP - Fiberglass Reinforced Plastics
- FGEOL – final geological report
- FH – full-hole tool joint
- FI – final inspection
- FID – final investment decision
- FID - flame ionisation detection
- FIL – FIL log
- FI(M) – free issue (materials)
- FINST – final stratigraphic report
- FINTP – formation interpretation
- FIP – flow-induced pulsation
- FIT – fairing intervention tool
- FIT – fluid identification test
- FIT – formation integrity test
- FIT – formation interval tester
- FIV – flow-induced vibration
- FIV – formation isolation valve
- FJC - Field Joint Coating
- FL – F log
- FLAP - fluid level above pump
- FLDF - Flying Lead Deployment Frame
- FLIV – flowline injection valve
- FLIV – flowline isolation valve
- FLET - Flowline End Termination
- aFLET - Actuated Flowline End Termination
- FLNG - Floating liquefied natural gas
- FLOG – FLOG PHIX RHGX Log
- FLOPR – flow profile report
- FLOT – flying lead orientation tool
- FLOW – flow and buildup test report
- FLRA – field-level risk assessment
- FLS – fluid sample
- FLT – fault (geology)
- FMEA – failure modes, & effects analysis
- FMECA – failure modes, effects, and criticality analysis
- FMI – formation micro imaging log (azimuthal microresistivity)
- FMP – formation microscan report
- FMS – formation multi-scan log; formation micro-scan log
- FMT - Flow Management Tool
- FMTAN – FMT analysis report
- FOBOT - Fibre Optic Break Out Tray
- FOET – Further Offshore Emergency Training
- FOF - Face of Flange
- FOSA - Field Operating Services Agreement
- FOSV – full-opening safety valve
- FPDM – fracture potential and domain modelling/mapping[8][9]
- FPH – feet per hour
- FPIT – free-point indicator tool
- FPL – flow analysis log
- FPLAN – field plan log
- FPS - field production system
- FPSO – floating production storage and offloading vessel
- FPU – floating processing unit
- FRA – fracture log
- FRARE – fracture report
- FRES – final reserve report
- FS – fail safe
- FSB – flowline support base
- FSI – flawless start-up initiative
- FSO – floating storage offloading vessel
- FT – formation tester log
- FTM – fire-team member
- FTP – first tranche petroleum
- FTR – Function Test Report
- FTRE – formation testing report
- FULDI – full diameter study report
- FV – funnel viscosity or float valve
- FWHP – flowing well-head pressure
- FWKO – free water knock-out
- FWL – free water level
- FWR – final well report
- FWV – flow wing valve (also known as production wing valve on a xmas tree)
- F_L - FNL/FEL, from north/east line
G
- G/C – Gas Condensate
- GC - Gathering Center
- G&P – Gathering and Processing
- G&T- Gathering and Transportation
- GALT - Gross Air Leak Test
- GAS – Gas Log
- GASAN – Gas Analysis Report
- GBS – Gravity Based Structure
- GBT – Gravity Base Tank
- GCLOG – Graphic Core Log
- GCT – GCT Log
- GDAT – Geodetic Datum
- GDE - Gross Depositional Environment
- GDIP – Geodip Log
- GDT – Gas Down To
- GE – Condensate gas equivalent
- GE – Ground Elevation (also [GR or GRE])
- GEOCH – Geochemical Evaluation
- GEODY – GEO DYS Log
- GEOEV – Geochemical Evaluation Report
- GEOFO – Geological & Formation Evaluation Report
- GEOL – Geological Surveillance Log
- GEOP – Geophone Data Log
- GEOPN – Geological Well Prognosis Report
- GEOPR – Geological Operations Progress Report
- GEORE – Geological Report
- GGRG – Gauge Ring
- GIIP – Gas Initially In Place
- GIH – Go In Hole
- GIS – Geographic Information System
- GL – Gas Lift
- GL – Ground Level
- GLE – Ground Level Elevation (generally in metres above mean sea level)
- GLM – Gas Lift Mandrel (alternative name for Side Pocket Mandrel)
- GLR – Gas Liquid Ratio
- GLT – GLT Log
- GLV – Gas Lift Valve
- GLW –
- GOC – Gas Oil Contact
- GOM – Gulf of Mexico
- GOP – Geological Operations Report
- GOR – Gas Oil Ratio
- GOSP – Gas/Oil Separation Plant
- GPIT – General Purpose Inclinometry Tool (borehole survey)
- GPLT – Geol Plot Log
- GPTG - Gallons Per Thousand Gallons
- GPM- Gallons Per Mcf
- GPSL – Geo Pressure Log
- GR – Ground Level (or Elevation //(also [GE or GRE])) or Gamma Ray. Or Gauge Ring (measure hole size)
- GRAD – Gradiometer Log
- GRE – Ground Elevation (also [GR or GE])
- GRLOG – Grapholog
- GRN – Gamma Ray Neutron Log
- GRP – Glass Reinforced Plastic
- GRV – Gross Rock Volume
- GRSVY – Gradient Survey Log
- GS – Gas Supplier
- GS – Gel Strength
- GST – GST Log
- GTC/G - Gas Turbine Compressor/Generator
- GTL – Gas To Liquid
- GTW – Gas To Wire
- GUN – Gun Set Log
- GWC – Gas-Water Contact
- GWR – Guided Wave Radar
- GWREP – Geo Well Report
H
- HAZ – Heat Affected Zone
- HAZID – Hazard Identification (meeting)
- HAZOP – Hazardous Operation
- HBE - High Build Epoxy
- HBP - Held By Production
- HC – Hydrocarbons
- HCAL – HRCC Calliper (in Logs)(in Inches)
- HCCS – Horizontal Clamp Connection System
- HCM – Horizontal Connection Module. To connect the Xmas Tree to the Manifold
- HCS- High-Capacity Square mesh screens
- HDA – Helideck Assistant
- HDD – Horizontal Directional Drilling
- HDPE - High Density Polyethylene
- HDT – High Resolution Dipmeter Log
- HDU - Horizontal Drive Unit
- HEXT – Hex Diplog
- HFE – Human Factors Engineering
- HFL – Hydraulic Flying Lead
- HGO - Heavy Gas Oil
- HGS – High (Specific-)Gravity Solids
- HH - Horse Head (on pumping unit)
- HHP – Hydraulic Horsepower
- HI - Hydrogen Index
- HIPPS – High Integrity Pressure Protection System
- HIRA - Hazard Identification and Risk Assessment
- HISC – Hydrogen induced stress cracking
- HL – Hook Load
- HLCV - Heavy Lift Crane Vessel
- HLO – Heavy Load-out (Facility)
- HLO – Helicopter Landing Officer
- Hmax – Maximum Wave Height
- HNGS - flasked Hostile Natural Gamma-ray Spectrometry tool
- HOB - Hang on bridle (cable assy)
- HP – Hydrostatic Pressure
- HPGAG – High Pressure Gauge
- HPHT – High Pressure High Temperature (same as HTHP)
- HPPS – HP Pressure Log
- HPU – Hydraulic Power Unit
- HPWBM – High Performance Water Base Mud
- HRCC – HCAl of Calliper (in Inches)
- HRLA - High Resolution Laterolog Array (resistivity logging tool)
- HRF- Hyperbaric Rescue Facility/Vessel
- Hs – Significant Wave Height
- HSE – Health, Safety and Environment or Health & Safety Executive (United Kingdom)
- HSV- Hyperbaric Support Vessel
- HTHP – High Temperature High Pressure (same as HPHT)
- HTM – Helideck Team Member
- HVDC – High Voltage Direct Current
- HWDP – Heavy-Weight Drill Pipe (sometimes spelled Hevi-Wate)
- HUD – Hold Up Depth
- HUN - Hold Up Nipple
- HUET - Helicopter Underwater Escape Training
- HWDP – Heavy Weight Drill Pipe
- HYPJ – Hyperjet
- HYROP – Hydrophone Log
I
- I:P – Injector To Producer Ratio
- IADC – International Association of Drilling Contractors
- IAT - Internal Active Turret
- IBC – Intermediate Bulk Container
- ICoTA – Intervention and Coiled Tubing Association
- ICD – Inflow Control Device
- ICP – Intermediate Casing Point
- ICSS - Integrated Controls and Safety System
- ICSU – Integrated Commissioning and Start Up
- ICV – Interval Control Valve
- ICV – Integrated Cement Volume (of Borehole)(in Cubic Metres)
- ICW - InComplete Work
- ID – Inner or Internal Diameter (of a tubular component such as a casing)
- IDC – Intangible Drilling Costs
- IDEL – IDEL Log
- IEB – Induction Electro BHC Log
- IEL – Induction Electrical Log
- IF – Internal Flush tool joint
- iFLS - intelligent fast load shedding
- IGPE - Immersion Grade Phenolic Epoxy
- IH – Gamma Ray Log
- IHEC - Isolation of Hazardous Energy Certificate
- IHUC - Installation, Hook-Up and Commissioning
- IHV – Integrated Hole Volume (of Borehole) (in Cubic Metres)
- IIC - Infield Installation Contractor
- IJL – Injection Log
- IL – Induction Log
- ILI – InLine Inspection (Intelligent Pigging)
- ILOGS – Image Logs
- ILT - In-Line Tee
- IMAG – Image Analysis Report
- IMCA – International Marine Contractors Association
- IMPP - Injection Molded Polypropylene Coating System
- IMR - Inspection Maintenance and Repair
- INCR – Incline Report
- INCRE – Incline Report
- INDRS – IND RES Sonic Log
- INDT – INDT Log
- INDWE – Individual Well Record Report
- INJEC – Injection Falloff Log
- INSUR – Inrun Survey Report
- INVES – Investigative Program Report
- IOC – International Oil Company
- IOM - Installation, Operation and Maintenance Manual
- IPAA – Independent Petroleum Association of America
- IPC – Installed Production Capacity
- IPLS – IPLS Log
- IPR – Inflow Performance Relationship
- IPT - Internal Passive Turret
- IR – Interpretation Report
- IRC – Inspection Release Certificate
- IRTJ – IRTJ Gamma Ray Slimhole Log
- ISF – ISF Sonic Log
- ISFBG – ISF BHC GR Log
- ISFCD – ISF Conductivity Log
- ISFGR – ISF GR Casing Collar Locator Log
- ISFL – ISF-LSS Log
- ISFP – ISF Sonic True Vertical Depth Playback Log
- ISFPB – ISF True Vertical Depth Playback Log
- ISFSL – ISF SLS MSFL Log
- ISIP - Initial Shut In Pressure
- ISSOW - Integrated Safe System of Work
- ITD - Internal Turret Disconnectable
- ITR - Inspection Test Record
- ITS – Influx To Surface
- ITT - Internal Testing Tool. (For BOP test).
- IUG - Instrument Utility Gas
- IWCF – International Well Control Federation
- IWOCS – Installation / Workover Control System
J
- J&A – Junked and Abandoned
- JB – Junk Basket
- JIB - Joint Interest Billing
- JLT - J-Lay Tower
- JT – Joule-Thomson (effect/valve/separator)
- JTS - Joints
- JU – Jack-Up drilling rig
- JV - Joint Venture
- JVP – Joint Venture Partners/Participants
K
- KBE – Kelly Bushing Elevation (in meters above sea level, or meters above Ground Level)
- KBUG – Kelly Bushing under ground (drilling up in coal mines, West Virginia, Baker & Taylor Drilling)
- KCI - Potassium Chloride (KCI) mud
- KD – Kelly Down
- KMW - Kill Mud Weight
- KOP – Kick-Off Point Directional Drilling
- KOP – Kick Off Plug
- KP – Kilometre post
- KRP – Kill Rate Pressure
- KB – Kelly Bushing
- KBG – Kelly Bushing Height above Ground Level
- KT - Kill Truck
L
- LACT – Lease Automatic Custody Transfer
- LAH – Lookahead
- LAOT – Linear Activation Override Tool
- LARS – Launch & Recovery System
- LAS - Log ASCII Standard
- LAT – Lowest Astronomical Tide
- LCM – Lost Circulation Material
- LCNLG – LDT CNL Gamma Ray Log
- LD – Lay Down (tubing, rods, etc.)
- LDAR - Leak Detection and Repair
- LDL – Litho Density Log
- LDS - Leak Detection System (pipeline monitoring)
- LDTEP – LDT EPT Gamma Ray Log
- LEAKL – Leak Detection Log
- LEPRE – Litho-Elastic Property Report
- LER – Lands Eligible for Remining or Land Equivalent Ratio
- LGO – Light Gas Oil
- LGR – Liquid Gas Ratio
- LGS – Low (specific-)Gravity Solids
- LIC – License
- LIB - Lead Impression Block
- LINCO – Liner and Completion Progress Report
- LIOG – Lithography Log
- LIT – Lead Impression Tool
- LITDE – Litho Density Quicklook Log
- LITHR – Lithological Description Report
- LITRE – Lithostratigraphy Report
- LITST – Lithostratigraphic Log
- LKO – Lowest Known Oil
- LL – Laterolog
- LMAP – Location Map
- LMRP – Lower Marine Riser Package
- LMV – Lower Master Valve (on a Xmas tree)
- LNG – Liquefied Natural Gas
- LOA – Letter of Authorisation/Agreement/Authority
- LOE – Lease Operating Expenses
- LOGGN – Logging Whilst Drilling
- LOGRS – Log Restoration Report
- LOGSM – Log Sample
- LOLER – Lifting Operations and Lifting Equipment Regulations
- LOT – Leak-Off Test
- LOT – Linear Override Tool
- LOT – Lock Open Tool
- LOTO – Lock Out / Tag Out
- LP – Low Pressure
- LPG – Liquefied Petroleum Gas
- LPH – Litres Per Hour
- LPWHH – Low Pressure Well Head Housing
- LRA – Lower Riser Assembly
- LRP – Lower Riser Package
- LSBGR – Long Spacing BHC GR Log
- LSD – Land Surface Datum
- LSP – Life Support Package
- LSSON – Long Spacing Sonic Log
- LT – Linear Time or Lag Time
- L&T - Load and Test
- LTC - Long Thread and Coupled
- LT&C - Long Thread and Coupled
- LTI(FR) – Lost Time Incident (Frequency Rate)
- LTP - liner shaker, tensile bolting cloth, perforated panel backing.
- LUMI – Luminescence Log
- LUN - Livening Up Notice
- LVEL – Linear Velocity Log
- LVOT – Linear Valve Override Tool
- LWD – Logging While Drilling
- LWOL - Last Well on Lease
- LWOP – Logging Well on Paper