List of Oil Field Acronyms Information (List Oil Field) @ OilDiscovered.com

List of Oil Field Acronyms Information

The oil and gas industry uses many acronyms and abbreviations. Obviously, this list is not anywhere near exhaustive or definitive.

It is an amalgam of user contributions. It is contextual and is meant for indicative purposes only. It should not be relied upon for anything but general information.

#

2D - Two dimensional (geophysics)
2P - Proved and Probable Reserves
3D - Three dimensional (geophysics)
3P - Proved, Probable and Possible Reserves
4D - Multiple Three dimensional's overlapping each other (geophysics)
7P - Prior Preparation and Precaution Prevents Piss Poor Performance, also Prior Proper Planning Prevents Piss Poor Performance

A

AADE - American Association of Drilling Engineers
AAODC - American Association of Oilwell Drilling Contractors (obsolete; superseded by IADC)
AAV - Annulus Access Valve
ABAN - Abandonment
ACHE - Air Cooled Heat Exchanger
ACOU - Acoustic
ACQU - Acquisition Log
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 Below Derrick Floor
AIRG - Airgun
AIRRE - Airgun Report
AIT - Array Induction Tool
AL - Appraisal Licence (United Kingdom), a type of onshore licence issued before 1996
ALARP - As Low As Reasonably Practicable
ALC - Vertical Seismic Profile Acoustic Log Calibration Report
ALR - Acoustic Log Report
aMDEA - activated Methyldiethanolamine
AMS - Auxiliary Measurement Service Log
AMV - Annulus Master Valve ^[1]
ANACO - Analysis of Core Logs Report
ANARE - Analysis Report
AOF - Absolute Open Flow
AOFP - Absolute Open Flow Potential
APD - Application for Permit to Drill
API - American Petroleum Institute: both the organisation and measure of oil weight (API gravity) in ºAPI
APPRE - Appraisal Report
APS - Active Pipe Support
ARACL - Array Acoustic Log
ARESV - Analysis of Reservoir
ARI - Azimuthal Resistivity Image
ARRC - Array Acoustic Report
AS - Array Sonic Processing Log
ASI - ASI Log
ASME - American Society of Mechanical Engineers
ASP - Array Sonic Processing Report
ASTM - American Society for Testing and Materials
ASCSSV - Annulus Surface Controlled Sub-Surface Valve ^[1]
ASV - Annular Safety Valve
AV - Annular Velocity or Apparent Viscosity
AVO - Amplitude Versus Offset (geophysics)
AWB/V - Annulus Wing Block/Valve (XT)
AWO - Approval for Well Operation

B

B or b - prefix denoting a number in billions
bbl - barrel
BBSM - Behavioural Based Safety Management
Bcf - billion cubic feet (of natural gas)
Bcfe - billion cubic feet (of natural gas equivalent)
BDF - Below Derrick Floor
BDL - Bit Data Log
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
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
boepd - barrel(s) of oil equivalent per day
BOM - Bill of Materials
BOP - Blowout Preventer
BOP - Bottom of Pipe
bopd - barrel(s) of oil per day
BOREH - Borehole Seismic Analysis
BOSIET - Basic Offshore Safety Induction and Emergency Training
BOTHL - Bottom Hole Locator Log
BOTTO - Bottom Hole Pressure/Temperature Report
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)
BSEE - US: Bureau of Safety and Environmental Enforcement (Formerly the MMS)
BSR - Blind Shear Rams (Blowout Preventer)
BS&W - Basic Sediments and Water
BTHL - Bottom Hole Log
BTU - British Thermal Units
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 - Caliper Log
CALOG - Circumferential Acoustic Log
CALVE - Calibrated Velocity Log Data
CAPP - Canadian Association of Petroleum Producers
CART - Cam Actuated Running Tool (Housing Running Tool)
CAS - Casing Log
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 casaing features)
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
CDP - Common Depth Point (geophysics)
CDP - Comprehensive Drilling Plan
CDRCL - Compensated Dual Resistivity Cal. Log
CE - CE Log
CERE - Cement Remedial Log
CECAN - CEC Analysis
CEME - Cement Evaluation
CET - Cement Evaluation Tool
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 - Caliper HDT Playback Log
CHECK - Checkshot and Acoustic Calibration Report
CHESM - Contractor, Health, Environment and Safety Management
CHKSR - Checkshot Survey Report
CHKSS - Checkshot Survey Log
CHP - Casing Hanger Pressure (pressure in an annulus as measured at the casing hanger)
CHROM - Chromatolog
CHRT - Casing Hanger Running Tool
CIBP - Cast Iron Bridge Plug
CILD - Conduction Log
CIMV - Chemical Injection Metering Valve
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
CMP - Common Midpoint (geophysics)
CMR - CMR Log
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 Normalized Compensated Neutron Porosity
CO - Change Out (ex. from rod equipment to casing equipment)
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
COXY - Carbon/Oxygen Log
CPI separator - Corrugated plate interceptor
CPI - CPI Log
CPICB - CPI Coriband Log
CPIRE - CPI Report
CRA - Corrosion Resistant alloy
CRET - Cement Retainer Setting Log
CRT - Clamp Replacement Tool
CsF - Caesium Formate (coincidentally also an acronym of the sole large-scale supplier of caesium formate brine, Cabot Specialty Fluids.)
csg - casing
CSHN - Cased Hole Neutron Log
CSI - CSI Log
CSMT - Core Sampler Tester Log
CSPG - Canadian Society of Petroleum Geologists
CST - CST Log
CSTAK - Core Sample Taken Log
CSTRE - CST Report
CSUG - Canadian Society for Unconventional Gas
CT - Coiled Tubing
CTD - Coiled Tubing Drilling
CTCO - Coiled Tubing Clean Out
CTOD - Crack Tip Opening Displacement
CTRAC - Cement Tracer Log
CUT - Cutter Log
CUTTD - Cuttings Description Report
CWOP- Complete Well On Paper
CWOR- Completion Work Over Riser
CYBD - Cyberbond Log
CYBLK - Cyberlook Log
CYDIP - Cyberdip Log
CYDN - Cyberdon Log
CYPRO - Cyberproducts Log

D

D&C - Drilling and Completions
DAC - Dipole Acoustic Log
DARCI - Darci Log
DAT - Wellhead Housing Drill-Ahead Tool
DAZD - Dip and Azimuth Display
DBB - Double Block & Bleed
DC - Drill Centre
DC - Drill Collar(s)
DCAL - Dual Caliper Log
DD - Directional Driller or Directional Drilling
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
DECC - Department for Energy and Climate Change (United Kingdom)
DECT - Decay Time
DEFSU - Definitive Survey Report
DELTA - Delta-T Log
DEN - Density Log
DEPAN - Deposit Analysis Report
DEPC - Depth Control Log
DESFL - Deep Induction SFL Log
DEV - Development Well, Lahee classification
DEVLG - Deviation Log
DEXP - D-Exponent Log
DF - Derrick Floor
DFR - Drilling Factual Report
DH - Drilling History
DHC - Depositional History Curve
DHSV - Downhole Safety Valve
DHPTT - Downhole Pressure/Temperature Transducer
DIBHC - DIS BHC Log
DIEGR - Dielectric Gamma Ray Log
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 Licence (United Kingdom), a type of onshore licence issued before 1996
DLIST - Dip List Log
DLL - Dual Laterolog
DLS - Dog-Leg Severity (directional drilling)
DMA - Dead Man Anchor
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, Lahee classification
DQLC - Dipmeter Quality Control Log
DR - Dummy Run Log
DR - Drilling Report
DRI - Drift Log
DRLCT - Drilling Chart
DRLOG - Drilling Log
DRLPR - Drilling Proposal/Prog. Report
DRPG - Drilling Program Report
DRPRS - Drilling Pressure
DRREP - Drilling Report
DRYRE - Drying Report
DS - Deviation Survey
DSCAN - DSC Analysis Report
DSI - Dipole Shear Imager
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
DSV - Diving Support Vessel or Drilling Supervisor
DTI - Department of Trade and Industry (United Kingdom) (obsolete; superseded by dBERR, which was then superseded by DECC)
DTPB - CNT True Vertical Depth Playback Log
DTT - Depth To Time
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&A - Exploration and Appraisal
E&P - Exploration and Production
ECD - Equivalent Circulating Density
ECP - External Casing Packer
ECRD - Electrically Controlled Release Tool
EDP - Exploration Drilling Program Report
EDP - Emergency Disconnect Package
EFL - Electrical Flying Lead
EFR - Engineering Factual Report
EGMBE - Ethylene Glycol Mono-Butyl Ether
ELT - Economic Limit Test
EL - Electric Log
EM - EMOP Log
EMOP - EMOP Well Site Processing Log
EMP - Electromagnetic Propagation Log
EMW - Equivalent Mud Weight
EN PI - Enhanced Productivity Index Log
ENG - Engineering Log
ENGF - Engineer Factual Report
ENGPD - Engineering Porosity Data
ENJ - Enerjet Log
EOFL - End of Field Life
EOR - Enhanced Oil Recovery
EOW - End Of Well Report
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
EPT - EPT Log
EPTNG - EPT-NGT Log
ER(D) - Extended Reach (Drilling)
ERT - Emergency Response Training
ESD - Emergency Shut-Down
ESP - Electric Submersible Pump
ETAP - Eastern Trough Area Project
ETTD - Electromagnetic Thickness Test
ETU - Electrical Test Unit
EUR - Estimated Ultimate Recovery
EVARE - Evaluation Report
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
FACHV - Four Arm Caliper Log
FANAL - Formation Analysis Sheet Log
FAT - Factory Acceptance Testing
FBE - Fusion Bonded Epoxy
FC - Float Collar
FCP - Final circulating pressure
FCVE - F Curve Log
FDC - Formation Density Log
FDP - Field Development Plan
FDS - Functional Design Specification
FEED - Front End Engineering and Design
FER - Field Equipment Room
FEWD - Formation Evaluation While Drilling
FFAC - Formation Factor Log
FFM - Full Field Model
FGEOL - Final Geological Report
FH - Full Hole tool joint
FI - Final Inspection
FID - Final Investment Decision
FIL - FIL Log
FI(M) - Free Issue (Materials)
FINST - Final Stratigraphic Report
FINTP - Formation Interpretation
FIT - Formation Integrity Test
FIV - Formation Isolation Valve
FL - F Log
FLIV - FlowLine Injection Valve
FLIV - Flowline Isolation Valve
FLOG - FLOG PHIX RHGX Log
FLOPR - Flow Profile Report
FLOT - Flying Lead Orientation Tool
FLOW - Flow & 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 Microimager Log
FMP - Formation Microscan Report
FMS - Formation Multiscan Log
FMTAN - FMT Analysis Report
FOET - Further Offshore Emergency Training
FOSV - Full Opening Safety Valve
FPIT - Free Point Indicator Tool
FPL - Flow Analysis Log
FPLAN - Field Plan Log
FPSO - Floating Production Storage and Offloading vessel
FPU - Floating Processing Unit
FRA - Fracture Log
FRARE - Fracture Report
FRES - Final Reserve Report
FS - Fail Safe (as in FS valve)
FSB - Flowline Support Base
FSI - Flawless Start-up Initiative
FSO - Floating Storage Offloading vessel
FT - Formation Tester Log
FTM - Fire-team Member
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)

G

G/C - Gas Condensate
GAS - Gas Log
GASAN - Gas Analysis Report
GBS - Gravity Based Structure
GBT - Gravity Base Tank
GCLOG - Graphic Core Log
GCT - GCT Log
GDIP - Geodip Log
GE - Condensate gas equivalent
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 Prog. Report
GEORE - Geological Report
GGRG - Gauge Ring
GIIP - Gas Initially In Place
GIS - Geographic Information System(s)
GL - Gas Lift or Ground Level
GLM - Gas Lift Mandrel (alternative name for Side Pocket Mandrel)
GLR - Gas Liquid Ratio
GLT - GLT Log
GLV - Gas Lift Valve
GOC - Gas Oil Contact
GOM - Gulf of Mexico
GOP - Geological Operations Report
GOR - Gas Oil Ratio
GOSP - Gas/Oil Separation Plant
GPIT - Inclinometry Tool Log
GPLT - Geol Plot Log
GPSL - Geo Pressure Log
GRAD - Gradiometer Log
GRLOG - Grapholog
GRN - Gamma Ray Neutron Log
GRP - Glass Reinforced Plastic
GRV - Gross Rock Volume
GRSVY - Gradient Survey Log
GST - GST Log
GTL - Gas to liquids
GTW - Gas To Wire
GUN - Gun Set Log
GWC - Gas-Water Contact
GWREP - Geo Well Report

H

HAZID - Hazard Identification (meeting)
HAZOP - Hazardous Operation
HC - Hydrocarbons
HCCS - Horizontal Clamp Connection System
HCM - Horizontal Connection Module. To connect the Xmas Tree to the Manifold
HDA - Helideck Assistant
HDT - High Resolution Dipmeter Log
HEXT - Hex Diplog
HFE - Human Factors Engineering
HFL - Hydraulic Flying Lead
HGS - High (specific-)Gravity Solids
HHP - Hydraulic Horsepower
HIPPS - High Integrity Pressure Protection System
HISC - Hydrogen induced stress cracking
HL - Hook Load
HLO - Heavy Load-out (Facility)
HLO (job role/ training course) - Helicopter Landing Officer
Hmax - Maximum Wave Height
HP - Hydrostatic Pressure
HPGAG - High Pressure Gauge
HPHT - High Pressure High Temperature (same as HTHP)
HPPS - HP Pressure Log
HPU - Hydraulic Power Unit
Hs - Significant Wave Height
HSE - Health, Safety and Environment or Health & Safety Executive (United Kingdom)
HTHP - High Temperature High Pressure (same as HPHT)
HTM - Heideck Team Member
HVDC - High Voltage Direct Current
HWDP - Heavy-Weight Drill Pipe (sometimes spelled Hevi-Wate)
HUD - Hold Up Depth
HWDP - Heavy Weight Drill Pipe
HYPJ - Hyperjet
HYROP - Hydrophone Log

I

I:P - Injector To Producer Ratio
IADC - International Association of Drilling Contractors
IBC - Intermediate Bulk Container
ICoTA - Intervention and Coiled Tubing Association
ICD - Inflow Control Device
ICP - Intermediate Casing Point
ICSU - Integrated Commissioning and Start Up
ICV - Interval Control Valve
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
IH - Gamma Ray Log
IJL - Injection Log
IL - Induction Log
ILI - InLine Inspection (Intelligent Pigging)
ILOGS - Image Logs
IMAG - Image Analysis Report
IMCA - International Marine Contractors Association
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
IPAA - Independent Petroleum Association of America
IPC - Installed Production Capacity
IPLS - IPLS Log
IPR - Inflow Performance Relationship
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
ITS - Influx To Surface
IWCF - International Well Control Federation
IWOCS- Installation / Workover Control System

J

J&A - Junked and abandoned
JB - Junk Basket
JU - Jack-Up drilling rig
JT - Joule-Thomson (effect/valve/separator)
JVP - Joint Venture Partners/Participants

K

KOP - Kick-Off Point (directional drilling)
KOP - Kick Off Plug
KRP - Kill rate pressure
KB - Kelly Bushing

L

LACT - Lease Automatic Custody Transfer
LAH - Lookahead
LAOT - Linear Activation Over-ride Tool
LARS - Launch & Recovery System
LAT - Lowest Astronomical Tide
LCM - Lost Circulation Material
LCNLG - LDT CNL Gamma Ray Log
LD - Lay down (tubing, rods, etc.)
LDL - Litho Density Log
LDTEP - LDT EPT Gamma Ray Log
LEAKL - Leak Detection Log
LEPRE - Litho-Elastic Property Report
LGR - Liquid Gas Ratio
LGS - Low (specific-)Gravity Solids
LINCO - Liner and Completion Prog. Report
LIOG - Lithography Log
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 - Liquified Natural Gas
LOA - Letter of Authorisation/Agreement
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 - Liquified Petroleum Gas
LRP - Lower Riser Package
LSBGR - Long Spacing BHC GR Log
LSSON - Long Spacing Sonic Log
LT - Linear Time
LTI(FR) - Lost Time Incident (Frequency Rate)
LUMI - Luminescence Log
LVEL - Linear Velocity Log
LWD - Logging While Drilling
LWOP - Logging well on Paper

M

M or m - prefix designating a number in thousands (not to be confused with SI prefix M for mega- or m for milli)
MAASP - Maximum Acceptable [or Allowable] Annular Surface Pressure
MAC - Multipole Acoustic Log
MACL - Multiarm Caliper Log
MAGST - Magnetostratigraphic Report
MAOP - Maximum Allowable Operating Pressure
MARA - Maralog
MAWP - Maximum Allowable Working Pressure
Mbd - thousand barrels per day
Mbod - thousand barrels of oil per day
Mboed - thousand barrels of oil equivalent per day
MCD - Mechanical Completion Dossier
Mcf - thousand cubic feet of natural gas
Mcfe - thousand cubic feet of natural gas equivalent
MCHE - Main Cryogenic Heat Exchanger
MCM - Manifold Choke Module
MCS - Manifold & Connection System
MCS - Master Control Station
mD - millidarcy, measure of permeability, with units of area
MD - Measured Depth (see also MDSS)
MD - Measurements/Drilling Log
MDEA - Methyl Diethanolamine (aMDEA)
MDL - Methane Drainage Licence (United Kingdom), a type of onshore licence allowing natural gas to be collected "in the course of operations for making and keeping safe mines whether or not disused"
MDSS - Measured Depth Sub-Sea
MDT - Modular formation Dynamic Tester
MEA - Monoethanolamine
MEG - Mono-Ethylene Glycol
MEPRL - Mechanical Properties Log
MERCR - Mercury Injection Study Report
MERG - Merge FDC/CNL/Gamma Ray/Dual Laterolog/Micro SFL Log
MEST - MEST Log
MF - Marsh Funnel (mud viscosity)
MFCT - Multifinger Caliper Tool
MGL - Magnelog
MLH - Mud Liner Hanger
MIFR - Mini Frac Log
MINL - Minilog
MIPAL - Micropalaeo Log
MIST - Minimum Industry Safety Training
MIYP - maximum internal yield pressure
mKB - Meters below Kelly Bushing
ML - Microlog
MLL - Microlaterolog
MLF - Marine Loading Facility
MM or mm - prefix designating a number in millions (not to be confused with SI unit mm for millimetre)
MMbd - million barrels per day
MMbod - million barrels of oil per day
MMcf - million cubic feet (of natural gas)
MMcfe - million cubic feet (of natural gas equivalent)
MMS - Minerals Management Service, (United States)
mmscfd - million standard cubic feet per day
MMTPA - Millions of Metric Tonnes per Annum
mmstb - million stock barrels
MNP - Merge and Playback Log
MODU - Mobile Offshore Drilling Unit
MOF - Marine Offloading Facility
MOPU - Mobile Offshore Production Unit
MOT - Materials/Marine Offloading Terminal
MPA - Micropalaeo Analysis Report
MPD - Managed Pressure Drilling
MPFM - Multi-Phase Flow Meter
MPK - Merged Playback Log
MPP: Multiphase Pump: Pump, which can increase flowrate and pressure of the untreated wellstream (hydrocarbons in liquid and gas phase, water, CO2, N2, chemicals, etc.)
MPQT - Manufacturing Procedure Qualification Test
MPS - Manufacturing Procedure Specification
MPV - Multi Purpose Vessel
MQC - Multi Quick Connection Plate
MR - Marine Riser
MRCV - Multi Reverse Circulating Valve
MRIRE - Magnetic Resonance Image Report
MSCT - MSCT Gamma Ray Log
MSFL - Micro SFL Log
MSL - Mean sea level
MSL - Micro Spherical Log
MSS - Magnetic Single Shot
MST - MST EXP Resistivity Log
MTT - MTT Multi-Isotope Trace Tool
MUD - Mud Log
MUDT - Mud Temperatire Log
MuSol - Mutual Solvent
MVB - Master Valve Block (XT)
MWD - Measurement While Drilling
MWDRE - Measurement While Drilling Report
MWS - Marine Warranty Survey

N

NACE - National Association of Corrosion Engineers
NAPF - Non Aqueous Phase Fluid
NASA - Non Active Side Arm (term used in the North Sea for kill wing valve on a Xmas tree)
NAVIG - Navigational Log
NB - Nominal Bore
NDE - Non Destructive Examination
NEUT - Neutron Log
NFG - 'No Fucking Good' used for marking damaged equipment, not to be confused with NG being natural gas
NFI - No Further Investment
NFW - New Field Wildcat, Lahee classification
NGDC - National Geoscience Data Centre (United Kingdom)
NGL - Natural Gas Liquids
NGR - Natural Gamma Ray
NGRC - National Geological Records Centre (United Kingdom)
NGS - NGS Log
NGSS - NGS Spectro Log
NGT - NGT Log
NGTLD - NGT LDT QL Log
NGLQT - NGT QL Log
NGTR - NGT Ratio Log
NHDA - National Hydrocarbons Data Archive (United Kingdom)
NHPV - Net Hydrocarbon Pore Volume
NMHC - Non-Methane Hydrocarbons
NMVOC - Non-Methane Volatile Organic Compounds
NNS - Northern North Sea
NOISL - Noise Log
NOC - National Oil Company
NORM - Naturally Occurring Radioactive Material
NPD - Norwegian Petroleum Directorate, Norway
NPS - Nominal Pipe Size (sometimes NS)
NPSH - Net Positive Suction Head
NPV - Net Present Value
NRV - Non Return Valve (Chicksan valve that only allows flow in one direction)
NPW - New Pool Wildcat, Lahee classification
NS -North Sea
NTHF - Non-Toxic High Flash
NTU - Nephelometric Turbidity Unit
NUMAR - Magnetic Resonance Image Log

O

O&G - Oil and Gas (referring to the industry or the companies in it)
OBCS- Ocean Bottom Cable System
OBDTL - OBDT Log
OBEVA - OBDT Evaluation Report
OBM - Oil-Based Mud
OCIMF - Oil Companies International Marine Forum
OCL - Quality Control Log
OCTG - Oil Country Tubular Goods (oil well casing, tubing, and drill pipe)^[2]
OD - Outer Diameter (of a tubular component such as casing)
ODT - Oil Down To
OFST - Offset Vertical Seismic Profile
OEM - Original Equipment Manufacturer
OH - Openhole Log
OHC - Open Hole Completion
OIM - Offshore Installation Manager
OMRL - OMRL Log
ONAN - Oil Natural Air Natural cooled transformer
OOE - Offshore Operation Engineer (senior technical authority on an offshore oil platform)
OOT - Out of Tolerance
OPEC - Organization of Petroleum Exporting Countries
OPL - Operations Log
OPRES - Overpressure Log
OPS - Operations Report
ORICO - Oriented Core Data Report
OTDR - Optical Time Domain Reflectometry
OTIP - Operational Testing Implementation Plan
OTL - Operations Team Leader
OWC - Oil Water Contact
OT - Off Tree
OUT - Outpost, Lahee classification
OVCH - Oversize Charts
OVID - Offshore Vessel Inspection Database
OWC - Oil-Water Contact

P

P&A - plugged and abandoned (of a well)
PEA - Palaeo Environment Study Report
PADPRT - Pressure Assisted Drillpipe Running Tool
PAL - Palaeo Chart
PALYN - Palynological Analysis Report
PAR - Pre-Assembled Rack
PAGA - Public Address General Alarm
PAU - Pre-Assembled Unit
PBDMS - Playback DMSLS Log
PBR - Polished Bore Receptacle (component of a completion string)
PBTD - Plug Back Total Depth
PBU - Pressure Build Up (applies to integrity testing on valves)
PCB - Poly Chlorinated Biphenyl
PCCL - Perforation Casing Collar Locator Log
PCDM - Power and Control Distribution Module
PCKR - Packer
PCOLL - Perforation and Collar
PDC - Perforation Depth Control
PDC - Polycrystalline Diamond Composite (a type of drilling bit)
PDG - Permanent Downhole Gauge
PDKL - PDK Log
PDKR - PDK 100 Report
PDP - Proved Developed Reserves
PDNP - Proved Developed Not Producing
PE - Petroleum Engineer (but more universally, Professional Engineer)
PEDL - Petroleum Exploration and Development Licence (United Kingdom), introduced in the 8th Onshore Licensing Round
PENL - Penetration Log
PEP - PEP Log
PERDC - Perforation Depth Control
PERFO - Perforation Log
PERM - Permeability
PERML - Permeability Log
PESBG - Petroleum Exploration Society of Great Britain
PETA - Petrographical Analysis Report
PETD - Petrographic Data Log
PETLG - Petrophysical Evaluation Log
PETPM - Petrography Permeametry Report
PETRP - Petrophysical Evaluation Report
PFE - Plate/Frame Heat Exchanger
PFHE - Plate Fin Heat Exchanger
PLET - Pipeline End Termination
PFC - PFC Log
PFPG - Perforation Plug Log
PFREC - Perforation Record Log
PG - Pressure Gauge (Report)
PGB - Permanent Guide Base
PGOR - Produced Gas Oil Ratio
PH - Phasor Log
PHASE - Phasor Processing Log
PHOL - Photon Log
PHYFM - Physical Formation Log
PI - Productivity Index or (Permit Issued)
PINTL - Production Interpretation
PIP - Pipe in Pipe
PL - Production Licence (United Kingdom), a type of onshore licence issued before 1996
PLEM - Pipeline End Manifold
PLES -Pipeline End Structure
PLG - Plug Log
PLS - Position Location System
PLT - Production Logging Tool
PLTQ - Production Logging Tool Quicklook Log
PLTRE - Production Logging Tool Report
PMI - Positive Material Identification
PMV -Production Master Valve
POB - Personnel on Board
POBM - Pseudo-Oil-Based Mud
POF - Permanent Operations Facility
POOH / POH - Pull Out Of Hole
PON - Petroleum Operations Notice (United Kingdom)
POR - Density Porosity Log
POSFR - Post Fracture Report
POSTW - Post Well Appraisal Report
POSWE - Post Well Summary Report
PP - DXC Pressure Plot Log
ppcf - Pounds Per Cubic Foot
PPE - Preferred Pressure End
ppg - Pounds Per Gallon
PPI - Post Production Inspection/Intervention
PPI - Post Pipelay Installation
pptf - Pounds (per square inch) Per Thousand Feet (of depth) - a unit of fluid density/pressure
PPS - Production Packer Setting
PR2 - Testing regime to API6A Annex F
PRA - Production Reporting & Allocation
PREC - Perforation Record
PRESS - Pressure Report
PROD - Production Log
PROTE - Production Test Report
PROX - Proximity Log
PRSRE - Pressure Gauge Report
PSANA - Pressure Analysis
PSA - Production Sharing Agreement
PSC - Production Sharing Contract
PSD - Planned Shut-Down
PSIA - Pounds Per Square Inch Atmospheric
PSIG - Pounds Per Square Inch Gauge
PSL - Product Specification Level
PSLOG - Pressure Log
PSP - pseudostatic spontaneous potential
PSPL - PSP Leak Detection Log
PSQ - Plug Squeeze Log
PST - PST Log
PSV - Pipe Supply Vessel
PSV - Pressure Safety Valve
PSVAL - Pressure Evaluation Log
PTS - Pipeline Termination Structure
PTSET - Production Test Setter
PTTC - Petroleum Technology Transfer Council, United States
PU - Pick Up (tbg, rods, power swivel, etc.)
PUD - Proved Undeveloped Reserves
PUN - Puncher Log
PUR - Plant Upset Report
PUWER - Provision and Use of Work Equipment Regulations
PV - Plastic Viscosity
PVT - Pressure Volume Temperature
PVTRE - Pressure Volume Temperature Report
PW - Produced Water
PWB - Production Wing Block (XT)
PWRI - Produced Water Re-Injection
PWV - Production Wing Valve (also known as a flow wing valve on a Xmas tree)

Q

QC - Quality control
QCR - Quality Control Report
QL - Quicklook Log

R

RAC - Ratio Curves
RACI - Responsible / Accountable / Consulted / Informed
RAM - Reliability, Availability, and Maintainability
RAWS - Raw Stacks VSP Log
RBP - Retrievable Bridge Plug
RKB - Rotary Kelly Bushings
RCA - Root Cause Analysis
RCKST - Rig Checkshot
RCD - Rotating Control Device
RCL - Retainer Correlation Log
RCM - Reliability Centred Maintenance
RCR - Remote Component Replacement(Tool)
RE - Reservoir Engineer
REOR - Reorientation Log
RE-PE - Re-Perforation Report
RESAN - Reservoir Analysis
RESEV - Reservoir Evaluation
RESFL - Reservoir Fluid
RESI - Resistivity Log
RESL - Reservoir Log
RESOI - Residual Oil
REZ - Renewable Energy Zone (United Kingdom)
RF - Recovery Factor
RFLNG - Ready for LNG
RFMTS - Repeat Formation Tester
RFSU - Ready For Start-Up
RFT - Repeat Formation Tester
RFTRE - Repeat Formation Tester Report
RFTS - Repeat Formation Tester Sample
RIGMO - Rig Move
RIH - Run In Hole
RITT - Riser Insertion Tube (Tool)
RKB - Rotary Kelly Bushing (a datum for measuring depth in an oil well)
RLOF - Rock Loadout Facility
RMLC - Request for Mineral Land Clearance
RMP - Reservoir Management Plan
RMS - Ratcheting Mule Shoe
RNT - RNT Log
ROCT - Rotary Coring Tool
ROP - Rate of Penetration
ROV/WROV - Remotely Operated Vehicle/WorkClass Remotely Operated Vehicle, used for subsea construction and maintenance
ROZ - Recoverable Oil Zone
ROWS - Remote Operator Workstation
RPCM - Ring Pair Corrosion Monitoring
RROCK - Routine Rock Properties Report
RSS - Rig Site Survey
RST - Reservoir Saturation Tool (Schlumberger) Log
RTTS - Retrievable Test-Treat-Squeeze (packer)
RWD - Reaming While Drilling

S

SABA - Supplied Air Breathing Apparatus
SAGD - Steam Assisted Gravity Drainage
SALM - Single Anchor Loading Mooring
SAM - Subsea Accumulator Module
SAML - Sample Log
SAMTK - Sample Taker Log
SANDA - Sandstone Analysis Log
SAT - SAT Log
SAT - Site Acceptance Test
SB - SIT-BO Log
SBF - Synthetic Base Fluid
SBM - Synthetic Base Mud
SBT - Segmented Bond Tool
SC - Seismic Calibration
SCAL - Special core analysis
SCAP - Scallops Log
SCBA - Self Contained Breathing Apparatus
SCDES - Sidewall Core Description
scf - standard cubic feet (of natural gas)
SCHLL - Schlumberger Log also SCHLO, SCHLU
SCM(MB) - Subsea Control Module (Mounting Base)
SCO - Synthetic crude oil
SCRS - Sidewall Cores
SCSSV - Surface Controlled Subsurface Safety Valve
SD - Sonic Density
SDFD - Shut Down For Day
SDFN - Shut Down For Night
SDIC - Sonic Dual Induction
SDL - Supplier Document List
SDM/U - Subsea Distribution Module/Unit
SDPBH - SDP Bottom Hole Pressure Report
SDT - Step Draw-down Test (sometimes SDDT)
SDU/M - Subsea Distribution Unit/Module
SEA - Strategic Environmental Assessment (United Kingdom)
SECGU - Section Gauge Log
SEDHI - Sedimentary History
SEDIM - Sedimentology
SEDL - Sedimentology Log
SEDRE - Sedimentology REport
SEM - Subsea Electronics Module
Semi (or Semi-Sub) - Semi-Submersible Drilling Rig
SEPAR - Separator Sampling Report
SEQSU - Sequential Survey
SFL - Steel Flying Lead
SG - Static Gradient
SGSI - Shell Global Solutions International
SGUN - Squeeze Gun
SHA - Sensor Harness Assembly
SHDT - Stratigraphic High Resolution Dipmeter Tool
SHO - Stab and Hinge Over
SHOCK - Shcok Log
SHOWL - Show Log
SI/TA - Shut In/Temporarily Abandoned
SICP - Shut-In Casing Pressure
SIDPP - Shut-In Drill Pipe Pressure
SIDSM - Sidewall Sample
SIGTTO - Society of International Gas Tankers and Terminal Operators
SIMCON - Simultaneous Construction
SIMOPS - Simultaneous Operations
SIP - Shut In Pressure
SIPES - Society of Independent Professional Earth Scientists, United States
SIT - System Integration Test FR SIT - Field Representation SIT
SITHP - Shut In Tubing Hanger/Head Pressure (another term for CITHP)
SITT - Single TT Log
SIWHP - Shut-in Well Head Pressure
SKPLT - Stick Plot Log
SL - Seismic Lines
SLS - SLS GR Log
SLT - SLT GR Log
SMLS - Seamless PipeMPP:
SMPC- Subsea Multiphase Pump: Pump, which can increase flowrate and pressure of the untreated wellstream
SN - Seat Nipple
SNP - Sidewall Neutron Porosity
SNS - Southern North Sea
SOBM - Synthetic Oil Based Mud
SOLAS - Safety of Life at Sea
SONCB - Sonic Calibration Log
SONRE - Sonic Calibration Report
SONWR - Sonic Waveform Report
SONWV - Sonic Waveform Log
SOW _ Slip-On Wellhead
SP - Shot point (geophysics)
SP - Spontaneous Potential (Well Log)
SPCAN - Special core analysis
SPE - Society of Petroleum Engineers
SPEAN - Spectral Analysis
SPEL - Spectralog
SPFM - Single Phase Flow Meter
SPH - SPH Log
SPM - Side Pocket Mandrel or Strokes Per Minute (of a positive-displacement pump)
SPOP - Spontaneous Potential Log
SPP - Stand Pipe Pressure
SPROF - Seismic Profile
SPS - Subsea Production Systems
SPT - Shallower Pool Test, Lahee classification
SQL - Siesmic Quicklook Log
SRD - Seismic Reference Datum, an imaginary horizontal surface at which TWT is assumed to be zero
SREC - Seismic Record Log
SRT - Site Receival Test
SS - Subsea, as in a datum of depth, e.g. TVDSS (true vertical depth subsea)
SSCP -Subsea Cryogenic Pipeline
SSCS - Subsea Control System
SSD - Sliding Sleeve Door
SSG - Sidewall Sample Gun
SSIV - Subsea Isolation Valve
SSM - Subsea Manifolds
SSMAR - Synthetic Seismic Marine Log
SSPLR - Subsea Pig Launcher/Receiver
SSSL - Supplementary Seismic Survey Licence (United Kingdom), a type of onshore licence
SSSV - Sub-Surface Safety Valve
SSTT - Subsea Test Tree
SSU - Subsea Umbilicals
SSV - Surface Safety Valve
SSWI - Subsea Well Intervention
stab - Stabiliser
STAGR - Static Gradient Survey Report
stb - stock tank barrel
STC - STC Log
STFL - Steel Tube Fly Lead
STGL - Stratigraphic Log
STIMU - Stimulation Report
STKPT - Stuck Point
STL - STL Gamma Ray Log
STRAT - Stratigraphy, stratigraphic
STRRE - Stratigraphy Report
STOIIP - Stock Tank Oil Initially In Place
STOP - Safety Training Observation Program
STSH - String Shot
SUML - Summarised Log
SUMRE - Summary Report
SUMST - Geological Summary Sheet
SURF - Subsea/Umbilicals/Risers/Flowlines
SURFR - Surface Sampling Report
SURRE - Survey Report
SURVL - Survey Chart Log
SUT(A/B) - Subsea Umbilical Termination (Assembly/Box)
SW - Salt Water
SWD - Salt Water Disposal Well
SWE - Senior Well Engineer
SWHE - Spiral Wound Heat Exchanger
SWOT - Strengths, Weaknesses, Opportunities and Threats
SV - Sleeve Valve or Standing Valve
SYNRE - Synthetic Seismic Report
SYSEI - Synthetic Seismogram Log

T

TA - Temporarily Abandoned
TAGOGR - Thermally Assisted Gas/Oil Gravity Drainage
TAPLI - Tape Listing
TAPVE - Tape Verification
TAR - True Amplitude Recovery
TB - Tubing Puncher Log
TBT - Through Bore Tree
TCA - Total Corrosion Allowance
TCI - Tunsgten Carbide Insert (a type of rollercone drillbit)
TCF - Temporary Construction Facilities
TCF - Trillion Cubic Feet(of gas)
TCPD - Tubing-Conveyed Perforating Depth
TCU- Thermal Combustion Unit
TD - Target Depth
TD - Total Depth (depth of the end of the well; also a verb, to reach the final depth, used as an acronym in this case)
TDD - Total Depth (Driller)
TDL - Total Depth (Logger)
TDM - Touch Down Monitoring
TDS - Top Drive System
TDS - Total Dissolved Solids
TDT - TDT Log
TDTCP - TDT CPI Log
TDT GR - TDT Gamma Ray Casing Collar Locator Log
TEFC - Totally Enclosed Fan Cooled
TEG - Tri-ethylene Glycol
TELER - Teledrift Report
TEMP- Temperature Log
TFL - Through Flow Line
TGB - Temporary Guide Base
TGOR - Total Gas Oil Ratio (GOR uncorrected for gas lift gas present in the production fluid)
TH - Tubing Hanger
THERM - Thermometer Log
THP - Tubing Hanger Pressure (pressure in the production tubing as measured at the tubing hanger)
THRT - Tubing Hanger Running Tool
TIE - Tie In Log
TIH - Trip Into Hole
TIW - Texas Iron Works (pressure valve)
TIEBK - Tieback Report
TLI - Top of Logging Interval
TLOG - Technical Log
TMCM - Tranverse Mercator Central Meridian
TMD - Total Measured Depth in a wellbore
TNDT - Thermal Neutron Decay Time
TNDTG - Thermal Neutron Decay Time/Gamma Ray Log
TOC - Top Of Cement
TOC - Total Organic Content/Carbon
TOFD - Time of first data sample (on seismic trace)
TOFS - Time of first surface sample (on seismic trace)
TOH - Trip Out of Hole
TOOH - Trip Out Of Hole
TOL - Top Of Liner
TORAN - Torque and Drag Analysis
TPERF - Tool Performance
TQM - Total Quality Management
TRCFR - Total Recordable Case Frequency Rate
TSA - Thermally Sprayed Aluminium
TSI - Temporarily Shut In
TR - Temporary Refuge
TRA - Tracer Log
TRACL - Tractor Log
TRD - Total Report Data
TREAT - Treatment Report
TREP - Test Report
TRIP - Trip Condition Log
TRSV - Tubing Retrievable Safety Valve
TRSCSSV - Tubing Retrievable Surface Controlled Sub-Surface Valve
TRSCSSSV - Tubing Retrievable Surface Controlled Sub-Surface Safety Valve
TT - Transit Time Log
TTRD - Through Tubing Rotary Drilling
TV/BIP - Ratio of Total Volume (ore and overburden) to Bitumen In Place
TVBDF - True Vertical Depth Below Derrick Floor
TVD - True Vertical Depth
TVDPB - True Vertical Depth Playback Log
TVDSS - True Vertical Depth Sub Sea
TVELD - Time and Velocity to Depth
TVRF - True Vertical Depth versus Repeat Formation Tester
TWT - Two-Way Time (seismic)
TWTTL - Two-Way Travel Time Log

U

UBI - Ultrasonic Borehole Imager
UBIRE - Ultrasonic Borehole Imager Report
UCSU - Upstream Commissioning and Start-Up
UFJ - Upper Flex Joint
UGF - Universal Guide Frame
UIC - Underground Injection Control
UKCS - United Kingdom Continental Shelf
UKOOA - United Kingdom Offshore Operators Association
UKOOG - United Kingdom Onshore Operators Group
ULCGR - Uncompressed LDC CNL Gamma Ray Log
UMCA - Umbilical Midline Connection Assembly
UMV - Upper Master Valve (from a Xmas tree)
UPR - Upper Pipe Ram
URT - Universal Running Tool
USGS - United States Geological Survey
UTA - Umbilical Termination Assembly
UTM - Universal Transverse Mercator

V

VDENL - Variation Density Log
VDL - VDL Log
VDU - Vacuum Distillation Unit, used in processing bitumen
VELL - Velocity Log
VERAN - Verticality Analysis
VERIF - Verification List
VERLI - Verification Listing
VERTK - Vertical Thickness
VIR - Value Investment Ratio
VISME - Viscosity Measurement
VIV - Vortex induced Vibration
VLP - Vertical Lift Performance
VLTCS - Very Low Temperature Carbon Steel
VO - Variation Order
VOCs - Volatile Organic Compounds
VOR - Variation Order Request
VRR - Voidage Replacement Ratio
VSD - Variable Speed Drive
VSP - Vertical Seismic Profile
VSPRO - Vertical Seismic Profile
VTDLL - Vertical Thickness Dual Laterolog
VTFDC - Vertical Thickness FDC CNL Log
VTISF - Vertical Thickness ISF Log
VWL - Velocity Well Log
VXT - Vertical Christmas Tree

W

WABAN - Well Abandonment Report
WAG - Water Alternating Gas (describes an injection well which alternates between water and gas injection)
WALKS - Walkaway Seismic Profile
WATAN - Water Analysis
WAVF - Waveform Log
WBM - Water-Based Mud
WC - Watercut
WE - Well Engineer
WEG - Wireline Entry Guide
WELDA - Well Data Report
WELP - Well Log Plot
WEQL - Well Equipment Layout
WESTR - Well Status Record
WESUR - Well Summary Report
WFAC - Waveform Acoustic Log
WGEO - Well Geophone Report
WGFM - Wet Gas Flow Meter
WGUNT - Water Gun Test
WH - Well History
WHIG - Whitehouse Gauge
WHP - Wellhead Pressure
WI - Water Injection
WI - Working Interest
WIT- Water Investigation Tool
WIPSP - WIP Stock Packer
WLC - Wireline Composite Log
WLL - Wireline Logging
WLSUM - Well Summary
WHM - Wellhead Maintenance
WHP - Wellhead Pressure
WOB - Weight On Bit
WOC - Wait on Cement
WOE - Well Operations Engineer (a key person of Well services)
WOM - Wait(ing) on Material
WORKO - Workover
WOS - West of Shetland, oil province on the UKCS
WOW - Wait(ing) On Weather
WP - Well Proposal or Working Pressure
WPLAN - Well Course Plan
WPQ/S - Weld Procedure Qualification/Specification
WPR - Well Prognosis Report
WR - Wireline Retievable (as in a WR Plug)
WRS - Well Report Sepia
WRSCSSV - Wireline Retrievable Surface Controlled Sub-Surface Valve
WSCL - Well Site Core Log
WSE - Well Seismic Edit
WSERE - Well Seismic Edit Report
WSHT - Well Shoot
WSL - Well Site Log
WSO - Water Shut Off
WSP - Well Seismic Profile
WSR - Well Shoot Report
WSS - Well Services Supervisor (leader of Well services at the wellsite)
WSSAM - Well Site Sample
WSSOF - WSS Offset Profile
WSSUR - Well Seismic Survey Plot
WSSVP - WSS VSP Raw Shots
WSSVS - WSS VSP Stacks
WSTL - Well Site Test Log
WSU - Well Service Unit
WT - Well Test
WTI - West Texas Intermediate benchmark crude
WUT - Water Up To
WVS - Well Velocity Survey

X

XL - or EXL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (1986) and the Sixth (1992)
XLPE -Cross-linked Polyethylene
XMT/XT/HXT - XMas Tree (Christmas Tree, the valve assembly on a production well-head)
XO - Cross-Over
XOM - Exxon Mobil
XOV - Cross-Over Valve

Y

yl - Holdup Factor
YP - Yield Point

Z

Z - Depth, in the geosciences referring to the depth dimension in any x,y,z data.

References

^ ^a ^b http://www.standard.no/PageFiles/1315/D-010r3.pdf
^ "OCTG (casing and tubing)". Network International Oilfield Glossary. Network International. http://www.networkintl.com/support/glossary.aspx#103.

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