ABBREVIATIONS

AND

GLOSSARY OF TERMS

USED IN THE OIL AND GAS PRODUCTION INDUSTRY

1980 compiled by J.A. Bartstra1982 update by H. van llorssen and J.P. Fortuin1990 checked by J.A. Bartstra

2002 update by J.C. Schreuder2005 updates by M. Vanderschaeghe and J.C. Schreuder2007 updates by Paul Cumby { DOP-31 }

Last updated: 15 December 2005 Page 1 of 15 SRAK, DOPBy: Marc Vanderschaeghe DOP1 and Jorrit Schreuder DOP22

NOTE: This document was scanned in from a Shell original document and converted to a new and updated electronic version, in 2002.

Glossary of Terms used in the Oil and Gas Production Industry

Note: In the realization that this compiled listing of abbreviations and terms is far from complete, find herewith links to other useful sources of information:

http://sww.shell.com/home/acronymMgr/en/showall/listAcronym.aspx

The above link gives access to the “Shell Online - Jargon Buster”, a massive listing of acronyms explained.

http://sww.shell.com/ep/solutions/team/catts/IRM/glossary/

The above link gives access to several different glossaries as compiled by the Shell Exploration & Production Solutions Team

http://www.glossary.oilfield.slb.com/

Link to: The Oilfield Glossary: Where the Oil Field Meets the Dictionary

The Schlumberger Oilfield Glossary is an evergreen, instant reference that takes up no space on your bookshelf and offers many special features: Comprehensive: definitions for major oilfield activities

Accessible: definitions for both the technical generalist and the expert

Accurate: definitions reviewed by technical experts

Illustrated: high-quality, full-color photographs and illustrations clarify many definitions

Thorough: citations of significant technical papers for further reading

Versatile: streamlined navigation, enhanced search capability and key resource links

Interactive: on-line capabilities allow for continual expansion and updating based on reader input.

Don't just take our word for it. The Schlumberger Oilfield Glossary has received Awards of Excellence from the Business Marketing Association (2001) and the Society for Technical Communication (2002). Launched in 1998, the Oilfield Glossary, which now includes more than 3800 entries, will continue to expand and improve. Drill into this reservoir of terminology!

http://www.akita-drilling.com/glossary_of_drilling_terms.htm

Link to: The Glossary of Drilling Terms by Akita Drilling Ltd

Last updated: 15 December 2005 Page 2 of 15 SRAK, DOPBy: Marc Vanderschaeghe DOP1 and Jorrit Schreuder DOP22

NOTE: This document was scanned in from a Shell original document and converted to a new and updated electronic version, in 2002.

Glossary of Terms used in the Oil and Gas Production Industry

ABBREVIATIONS

# Number@ at-VE negative+VE positiveAAR After Action ReviewAC Alternating current (vs. DC = direct current)ACD Above chart datumAD Assistant drillerAFE Authorization for ExpenditureAFFF Aqueous Film Forming FoamAGA American Gas AssociationAH Along holeAHBDF Along hole below derrick floorAHBGL Along hole below ground levelAHD Along hole depthAHORT Along hole original rotary tableAKO Adjustable kick-off sub (directional drilling tool)ALARP As Low As Reasonably PracticableALS Advanced Life SupportAMG Aircraft Management GuideAnn AnnulusANSI American National Standards Institute (previous ASA)API American Petroleum InstituteAPP As per programmeARQ Protocol used for transmitting telexes over SSB radiosASA American Standards Association (now ANSI)ASA Anchor Seal AssemblyASME American Society of Mechanical EngineersAssy AssemblyASTM American Society-for Testing MaterialsATLS Advanced Trauma and Life SupportAVG AverageAzim Azimuth (compass bearing)BA Breathing Apparatusbbl/d Barrels per daybbl/min Barrels per minuteBCD Below chart datumB/D Barrels per dayBDF Below derrick floorBG Back groundBGT Borehole geometry toolB/H Bent housing (directional drilling tool)BHA Bottom hole assemblyBHC Borehole compensated sonic logBHP Bottom hole pressureBHP Brake horsepowerB/HSG Bent housing (directional drilling tool)BHT Bottom hole temperatureBi-Cent Bi-centre (bit)BJ Blast jointBO Explosive service (back-off)B/O Break outBOP Blowout preventerBOPD Barrels of oil per dayBP Bridge plugBP Bull PlugBPC Bean performance curve

Last updated: August 2007 Page 3 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

BPD Barrels per dayBPM Barrels per minuteBPR Bottom Pipe RamBPV Backpressure valveBS Base sediment. BS British Standard.BS Bull manure…BS & W Base sediment and waterBTC Buttress Threaded & CoupledBTM BottomBTU, Btu British thermal unitBU Business UnitB/U Bottoms up (circulating)BU Build up (pressure, temperature, inclination)BUS Build up section (of a deviated well)BV Ball valveBWPD Barrels of water per dayCALM Cat Amery anchor leg mooringCAP Competent Authorised PersonCAO Computer applications for operationsCAO Computer assisted operations (Obsolete)CAPO Computer assisted production operationCARM Contractual Allocation of Risk Manual (contracting term)CB Core barrelCBD Competence based developmentCBL Cement bond logCBHP Closed in bottom hole pressureCBHT Closed in bottom hole temperatureCBP Competence based progressionCBT Computer based trainingC&C Circulate & ConditionCCL Casing collar locatorCD Chart datumCET Cement evaluation toolcf. Compare with or consultcft Cubic feetCG Casing gun (shaped charge perforator)CH Contract holderCHH Casing head housingCHP Casing head pressureCHS Casing head spoolCHT Casing head tensionCI Close(d) inCIBHP Closed in bottom hole pressureCIBHT Closed in bottom hole temperatureCIF Cost, Insurance & FreightCirc CirculateCIS Customer instrument serviceCITHP Closed in tubing head pressureCITHT Closed in tubing head temperatureCL, C/L Control lineCM Crisis ManagementCMC Carboxy methylcelluloseCMD Committee of managing directorsCMT CementCNL Compensated neutron logCO Carbon MonoxideCO2 Carbon DioxideCompl Complete(d), completionCONT, Cont’d ContinuedLast updated: August 2007 Page 4 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

COSHH Control of substances hazardous to healthCP Casing pressureCP Conductor pressureCPC Computer production controlCPH Baker Oil Tools tie back packerCPR Cardio-Pulmonary ResuscitationCR Company representativeCsg CasingCSR Company site representativeCST Casing seat testCT Check tripCT Coiled tubingCTD Coiled Tubing DrillingCTHP Closed in tubing head pressureCTHT Closed in tubing head temperatureCTT Cup type testedCTU Coiled Tubing UnitCW, C/W Complete withCWOP Completing the well on paperCYA Cover your arse (political astuteness and insurance…)DAPC Dynamic Annular Pressure ControlDC Direct current (vs. AC = alternating current)DC Drill collarDC(pony) Drill Collar short (or pony)DD Depth determinationDD Directional DrillingDE Drilling engineerDF Drilling floorDFE Derrick floor elevationDIL Dual induction laterologDIMS Drilling information management systemDL Dog LegDLL Dual laterologDMS Driving management systemDO Drop off section (in a deviated well)DOE Department of Energy (UK regulatory government body, now known as DTI)DP Drill pipeDROPS DRopped Objects Prevention Scheme (www.dropsworkpack.com)DRT Dual ram tension tubing headDS Drilling supervisorDS DownstreamDST Combination DLL and MSFLDST Drill stem testDSV Drilling SupervisorDTI Department of Trade and Industry

(UK regulatory government body, formerly known as HS&E and DOE)DTL Drilling the Limit (Shell Trademark for Technical Limit methodology)DtL Deliver the Limit (term for pursuit of Technical Limit)DTU Double tilted universal joint (directional drilling tool)DW, D/W Drill WaterDWOP Drilling the well on paperDWT Dead weight testerDWT Dead weight tonEA Environmental AssessmentEAR Event assessment reportECC Emergency Control CentreECD Equivalent circulation density, Equivalent column densityECP External casing packerECR Emergency Control room (Safety)ECT Emergency Control team (Safety)Last updated: August 2007 Page 5 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

EDIS Exploration Drilling Information SummaryEGP External gravel packEDP Electronic data processingEETP Emulsion and effluent treatment plantEIA Environmental Impact AssessmentELCB Earth Leakage Circuit BreakersELT Emergency Location TransmitterELTSR Extra long tubing seal receptacleEMA equivalent of methane in airEMA Equipment material administration system (ordering and tracking software)EMAS European audit management systemEMD Equivalent mud densityEMP Environmental Management PlanEMPAC Preventative maintenance system (software package) used by Transocean (a drilling

contractor)EMS Electro magnetic surveyEMS Electronic (magnetic) multi shotEOR Enhanced oil recoveryEP Exploration and productionE&P Exploration and productionEPBM EP Business ModelEPIRB Emergency Position Indicating Radio BeaconsEPO European Patent OfficeEPT Electromagnetic propagation toolEQPT EquipmentER Emergency responseES Equalizing subESD Emergency shutdown valveEst. EstimatedESS Electronic (magnetic) single shotESV Emergency shutdown valveETA Estimated Time of ArrivalETD Estimated Time of DepartureEU External upsetEUE External upset endsEXP Exposure (Safety)F FlowingFAC First Aid Case (Safety)FBG Formation breakdown gradientFBHP Flowing bottom hole pressureFBHT Flowing bottom hole temperatureF & BU Flowing and closed in pressure build up surveyF/C Flow checkFC Flow couplingFDC Formation density log compensatedFIT Formation Integrity testFH Full holeFIFO First In, First OutFL FlowlineFLD Full Length DriftFLP Flow line pressureFPI Free point indicatorFCP Fracture closure pressureFPP Fracture propagation pressureFRC Fast Rescue CraftFRD Focused result delivery (90 day intense team effort to realize an opportunity)FRED Fire, radiation, explosion, dispersionFST Formation strength testFT Formation testerFTD F**k the dog, a term used to describe “doing nothing”Last updated: August 2007 Page 6 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

FTHP Flowing tubing head pressureFTHT Flowing tubing head temperatureFTLB Foot Pounds (Torque)FUBAR F**d up beyond all recognitionFV Float ValveFWB Fresh Water BentoniteFWKO Free water knock outGDT Gas down toGHP Gas horsepowerGL Gas liftGL Ground Level (Top Cellar)GLR Gas liquid ratioGLV Gas lift valveGMS Gyro multi shotGN Grid NorthGOC Gas oil contactGoM Gulf of MexicoGOR Gas oil ratioGP Gravel packGPG Grains per gallonGPS Gradient pressure survey. GPS Geophysical SurveyGR Gamma rayGRL Gamma ray logGS Gradient surveyGSS Gyro single shotGTL Gas to liquidsGTS Gradient temperature surveyGWC Gas water contactGWR Gas water ratioGWSA Global Well Service Arrangements (contracting term, standard contracts with major ISCs)HAZID Hazard identification process (risk analysis)HAZOP Hazard and operability studyHCR High closing ratio (HCR valve, hydraulically operated valve on BOP outlet to choke line)HDT Dipmeter (high resolution digital)HEMP Hazard and effects management processHF High FrequencyHGR HangerHIA Health impact assessmentHHP Hydraulic horsepowerHI-VIS High viscousH/O Hang-off (point), reference landing-off point in the wellhead.HMP Hazard Management ProcessHP Horse powerHP High pressureHPHT High pressure and high temperatureHRA Health risk assessmentHRT High resolution thermometer (temperature log)H2S Hydrogen sulphideHSE Health, Safety and Environment HSECOP HSE Critical Operating ProcedureHSE-MS Health, Safety, Environment Management SystemHSE-Q Health, Safety, Environment and QualityHSSE Health, Safety, Security and EnvironmentHS & E Health, Safety and EnvironmentHS & E Department of Health, Safety and Environment (UK regulatory government body)HT High temperatureHUD Hold up depthHWC Hydrocarbon water contactHWDP Heavy weight drill pipeLast updated: August 2007 Page 7 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

HWO Heavy Workover Hz HertzHZGP Horizontal gravel packIADC International Association of Drilling ContractorsIAGC International Association of Geophysical ContractorsIATA International Air Transport AssociationIBOP Inner blow out preventerICAO International Civil Aviation OrganisationID Internal (inside) diameterID Interface Document (alternative to above)IEE Institute of Electrical EngineersIES Induction electrical surveyIF Internally flushIGP Internal (inside) gravel packIHP Indicated horsepowerINCL InclinationINT IntervalIMCO Intergovernmental Maritime Consultation OrganisationIMO International Maritime OrganisationIOEM Inverted oil emulsion mudIP Institute of PetroleumIPC Intake pressure curvesIPM Incident Potential Matrix. IPM Integrated project managementIPP Integrated production planIPR Inflow performance relationshipIPS Improved plow steelISC Integrated Service Provider / Contractor, e.g. Schlumberger, Baker, HalliburtonISF Induction-resistivity spherically focussed logISO International Organization for Standardization. International Standards OrganisationIVMS In vehicle monitoring systemIWCF International Well Control ForumJ JouleJB Junk basketJCP Job competence program/profileJHA Job hazard analysis (Safety)JM Journey managementJMS Journey management systemJNTS JointsJS Junk SubJSA Job Safety Analysis (safety) JV Joint ventureJV-nuoc Joint Ventures not under operational controlk thousandKCl Potassium ChlorideKISS principle Keep it simple, stupid!KOP Kick off pointKOIV Knock out isolation valveKPI Key performance indicatorKSA Kingdom of Saudi ArabiaLAT Lowest Astronomical Tide (tide table reference)L/D Lay downLCM Lost circulation materialsLDT Litho-density logLF Low FrequencyLH Left handLH Liner HangerLIT Limit intake testLM Lock mandrelLN Landing nippleLast updated: August 2007 Page 8 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

LNDG LandingLNG Liquefied natural gasLNGC Liquefied natural gas carrierLOT Leak off testLOTO Lock Out Tag OutLPG Liquefied petroleum gasLPT Loss Prevention TeamLS Long stringLSA Locator seal assemblyLSA Low specific activity (Radio active scale)LTA Lost time accident (Safety)LTC Long Thread & Coupling (Old API)LTI Lost time incident (safety)LTIF Lost time incident frequency (safety)LWC Lost workday case (safety)LWD Logging while drillingM ThousandMAASP Maximum allowable annular surface pressureMCO Materials Call OffMCUGP Milled casing under reamed gravel packMD Martin Decker (block + string weight indicator)MER Medical Emergency Response (Safety)MF Marsh funnelMGR ManagerMHH Mutually Hold Harmless (contracting term)MIC Man in chargeMIL One thousandth of an inchMIP Maximum inflow performanceMM MillionMM Milestone MeetingM/M Mud motorMOB Man Over BoardMOC Management of changeMODU Mobile offshore drilling unitMOPO Manual of permitted operationsMPD Managed Pressure DrillingMPR Middle Pipe Ram. MPR Monthly progress reportMSDS Material safety data sheetMSFL Micro spherically focussed logMSL Mean Sea LevelM/T EmptyMTC Medical Treatment Case (safety)MTU Master terminal unitM/U Make upMV Master valveMW Mud weightMRW Man Riding WinchMWD Measuring while drillingMW&I Mutually Waiver and Indemnity (contracting term)N2 NitrogenNACE National association of corrosion engineersNBS Near bit stabiliserNC Numbered Connection (API)N/D Nipple downNDB Non Directional BeaconNEG NegativeNFPA National Fire Protection AssociationNGL Natural gas liquidsNGS Natural gamma ray spectrometry logLast updated: August 2007 Page 9 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

NLL Neutron lifetime logNM Near Miss (safety)NMDC Non magnetic drill collarsNML Nuclear magnetism logNMR Nuclear Magnetic ResonanceNO Nitric oxideNO2 Nitrogen dioxideNTU Nephelometric Turbity UnitNU Non upsetN/U Nipple upOBM Oil base mudOCTG Oilfield Country Tubular Goods (API)OCS Outer Continental ShelfOD Outside diameterODP Opportunity delivery processODT Oil down toOE Operations engineerOECD Organization for Economic Co-operation and DevelopmentOEM Original equipment manufacturerOGP Oil and gas producers associationOH Occupational HealthOH Open hole OHGP Open hole gravel packOIM Offshore installation managerOJT On the job trainingOOH Out of holeO/P OverpullOPEC Organisation of Petroleum Exporting CountriesOPS OperationsOSC On scene commanderOSR On scene representativeO/SHOT OvershotOTC Over The CounterOU Open(ed) upOU Operating unitOUT Oil up toOWC Oil water contactP&A Plugged and abandonedPA Public AffairsPAC polyanionic cellulosePAPI Precision Approach Path IndicatorPBA Plugged back and abandonedPBR Polished bore receptaclePBTD Plugged back total depthpcf Pounds per cubic footPCT Combination production log (seqn.)PD Positive displacement (meter)PDM Positive displacement motorPE Petroleum engineerPFC PerfluorocarbonspH Potential hydrogen ion, measure of acidity or alkalinityPHB Pre-Hydrated BentonitePHPA partially-hydrolyzed polyacrylamide PI Productivity IndexPIC Person in ChargePJSM Pre-Job Safety MeetingPLD Personnel Locator DevicePLT Production Logging Tool PM Party managerP/n Part NumberLast updated: August 2007 Page 10 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

P/O Pop-offPO Purchase orderPOB Persons on boardPOBM Pseudo oil base mudPOH Pull(ed) out of holePON Petroleum Operations NoticePOOH Pull(ed) out of holePOS PositivePPD Permanent Partial Disability (safety)PPE Personal Protective EquipmentPPM Parts per millionppg Pounds per gallonPSI Pounds per square inchPSIA Pounds per square inch absolutePSIG Pounds per square inch gaugePSL Production Service Level (API)PSP Perforated steel platePTB Pounds per thousand barrelPTC Permanent type completionPTD Permanent Total Disability (safety)PTT Plug type testerPTT Post, Telegraph and TelecommunicationsP/U Pick upPTW Permit-to-WorkPTWC Permanent type well completion; obsolete, now PTCPV Plastic viscosityPVT Pressure volume temperaturePWD Pressure while drillingQA Quality assuranceQC Quality controlQHSE Quality, Health, Safety and EnvironmentQRA Quantitative risk assessmentR Range - Length of tubularRAB Resistivity at bit (Anadrill)RAF Risk Allocation Framework (contracting term)RAM Risk assessment matrixRAP Remedial action planRCCB Residual Current Circuit BreakerRCJB Reverse Circulation Junk BasketRe Reynolds numberRF Radio FrequencyRFT Repeat formation testerRGIT Robert Gordon Institute of Training (Aberdeen)RH Right handRI Run inRIH Run in holeRKB Rotary kelly bushingRM Rig managerROP Rate of progressROV Remote operating vehicleRPM Reservoir pressure maintenanceRPM Revolutions per minuteRR Re-RunRReam Roller ReamerRS Rig superintendentRSI Repetitive Strain IllnessRT Rotary tableRT Round tripRTL Realize the limit (pursuit of Technical Limit)RTTS Retrievable test treat squeeze packer (Halliburton)Last updated: August 2007 Page 11 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

RTU Remote terminal unitR/U Rig upRVP Reid vapour pressureRWC Restricted work case (safety)RWP Residual Work PlanS StandardSAL Shell Aircraft LimitedSALM Single anchor leg mooringSALS Single anchor leg storageSAQ Self Assessment QuestionnaireSAR Search and RescueSARBE Search and Rescue BeaconsSBHP Static bottom hole pressureSBHT Static bottom hole temperatureSBM Single buoy mooringSBOP Surface BOP (BOP placed above MSL, drilling from floaters)SBS Single buoy storageSBT Shoe Bond testSC Safety CaseSCADA Supervisory control and data acquisitionScft Standard cubic feetSCM Supply chain managementSCOP Safety Critical Operating ProcedureSCR Slow Circulation RateSCR Silicon Controlled Rectifier SCSSV Surface controlled subsurface safety valveSD Specific densityS/D Shut DownSDE Senior drilling engineerSDSV Senior Drilling SupervisorSDT Sedimentary Dipmeter toolSDTR Side trackSG Specific gravitySHOC Safe Handling of ChemicalsSIA Safety Integrity AssessmentSICP Shut in casing pressureSIDP Shut in drill pipe pressureSIEP Shell International Exploration and Production B.V.SIGN Shell International Global Network (Alta Vista Forum, electronic discussion forum)SJ Slip JointSJM Safe journey managerSLS Long spacing sonic logSMART Specific, Measurable, Achievable, Realistic and Time bound (key points for target setting).SMS Shell method seriesSMS Safety management systemSMWD Sperry measuring while drillings/n Serial NumberSO Side outletSOLAS Safety of Life at SeaSOR Specification of requirementsSOW Slip On WeldSP Spontaneous potentialSPM Side pocket mandrelSPM Strokes per minuteSPP Stand pipe pressureSRT Single ram tension tubing headSS Short stringSS Sub seaSS Single shotSSB Single Side BandLast updated: August 2007 Page 12 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

SSC Shell Safety CommitteeSSCSSV Subsurface controlled subsurface safety valveSSD Sliding side doorSSD Single string dualSSMP Site Specific Management PlanSSODD Sub Sea Operated Down hole DisconnectSSS Single string singleSStb String StabSTool Shock ToolSSV Surface safety valveSSV Single String VentureST Side trackSTD Sexually Transmitted DiseaseSTAB StabilizationSTOIIP Stock tank oil initially in placeSW SeawaterSWB Sea water bentoniteSWB Side wall sampleSWE Senior well engineerSWL Safe Working LoadSWS Sidewall samples

TA Temporary adapterTA CAP Temporary adapter capTAO Telemetry assisted operationsTBF Top bottom flangeTBG TubingTBP Tie back packerTBR Top blind ramsTBT Tool box talkTBV Tubing back-pressure valveT&C Threaded and coupled (joint)TCL Tubing Conveyed LoggingTCP Tubing conveyed perforatorTD Total depthT&D Tested & DriftedTDS Top Drive system, TDS Tie down spoolTDT Thermal decay time logTH Telescoping (travel) jointTHP Tubing head pressureTHS Tubing head spoolTJ Tool JointTJ Telescoping (travel) jointTLA Three letter abbreviationTLC Though logging conditionTLP Tension leg platformTOC Top of cementT&OE Technical & Operational Excellence (SIEP dept, based in Rijswijk, The Netherlands)TOL Top of linerTOR Terms of ReferenceTP Tool pusherTPR Top Pipe RamTQ Torque TR Trace(s)Trb TurbineTRC Total recordable cases (safety)TRCF Total recordable case frequency (safety)TROIF Total Recordable Occupational Health Incident FrequencyTSD Two string dualLast updated: August 2007 Page 13 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

TSR Tubing seal receptacleTRSSSVR Tubing retrievable sub surface safety valveTV True verticalTVBDF True vertical below derrick floorTVD True vertical depthTVP True vapour pressureTVRKB True vertical below rotary kelly bushingTVSS True vertical sub seaUAA Unsafe Act AuditUHF Ultra High FrequencyUPR Upper Pipe RamUPS Uninterrupted Power SupplyURGP Under reamed gravel packUROHGP Under reamed open hole gravel packUS UnserviceableUS UpstreamUTM Universal transverse mercatorUV Ultra VioletVAR Value assurance review VDF Variable Frequency DriveVDL Variable density log (usually run with CBL)VDU Visual display unitVHF Very High FrequencyVIV Vortex induced vibrations (onto risers, from sea currents)VLCC Very large crude carrierVLPC Very large product carrierV/V ValveVLV ValveVOCs Volatile organic compoundsVR Valve removal (Plug)VSP Velocity Seismic ProfileVTC Variation to ContractVTS Vehicle Tracking SystemWe Water cutWC Well completionWD Wheeled DriveWD Working depthWE Well engineerWGN Well Global Network (Alta Vista Forum, electronic discussion forum) Wgt WeightWH Well headWHP Well head pressureWIQI Well inflow quotient indexWL WirelineWLBOP Wireline blowout preventerWO WorkoverWOB Weight on bitWOC Waiting on cementWODL Waiting on day lightWOO Waiting on ordersWOW Waiting on weatherWP Well pullingWP Working pressureWPR Weekly Progress Reportwrt with respect toWSDE Well site drilling engineerWSPE Well site petroleum engineerWSOE Well site operations engineerWST Well shoot tool (seismic reference service)WT Wiper TripLast updated: August 2007 Page 14 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.

Glossary of Terms used in the Oil and Gas Production Industry

WTI West Texas Intermediate (crude)WUT Water up toWV Wing valveWW Water WellW&W Weight and waitX-O Cross overYP Yield point

Last updated: August 2007 Page 15 of 15 SRAK, DOP

NOTE: The base document was scanned in from a Shell original document and converted to a new and updated electronic version in 2002,as the electronic version of the original could not be found or recovered.