| API | American Petroleum Institute BG Background gas |
| BHA | Bottom Hole Assembly |
| BHP | Bottom Hole Pressure |
| BHT | Bottom hole temperature |
| BOP | Blow Out Preventer |
| BPD | Barrel Per Day |
| BPM | Barrels Per Minute |
| BPV | Back Pressure Valve |
| BUR | Build Up Rate |
| BWOC | By Weight Of Cement |
| BWOW | By Weight Of Water |
| CBL | Cement Bond Log |
| CET | Cement Evaluation Tool |
| CCD | Centre to Centre Distance |
| CCL | Casing Collar Locator |
| CDP | Common Depth Point |
| CET | Cement Evaluation Tool |
| CMT | Cement |
| CP | Conductor Pipe |
| CR | Cement Retainer |
| CRA | Corrosion Resistant Alloy |
| CW | Current Well |
| C/T | Coiled Tubing |
| DC | Drill Collar |
| DHM | Down Hole Motor |
| DIF | Drill-In Fluid |
| DLS | Dog Leg Severity |
| DHSV | Down Hole Safety Valve |
| DM / D&CM | Drilling & Completion Manager |
| DOB | Diesel Oil Bentonite |
| DOBC | Diesel Oil Bentonite Cement |
| DOR | Drop Off Rate |
| DP | Drill Pipe |
| DST | Drill Stem Test |
| DV | DV Collar |
| E/L | Electric Line |
| ECD | Equivalent Circulation Density |
| ECP | External Casing Packer |
| EMS | Electronic Multi Shot |
| EMW | Equivalent Mud Weight |
| EOC | End Of Curvature |
| ESD | Electric Shut-Down System |
| ESP | Electrical Submersible Pump |
| ETA | Expected Arrival Time |
| FBHP | Flowing Bottom Hole Pressure |
| FBHT | Flowing Bottom Hole Temperature |
| FPI/BO | Free Point Indicator / Back Off |
| FTHP | Flowing Tubing Head Pressure |
| FTHT | Flowing Tubing Head Temperature |
| GCT | Guidance Continuous Tool |
| GLR | Gas Liquid Ratio |
| GLS | Guidelineless Landing Structure |
| GMS | Gyro Multi Shot |
| GOC | Gas Oil Contact |
| GOR | Gas Oil Ratio |
| GP | Gravel Pack |
| GPM | Gallon (US) per Minute |
| GPS | Global Positioning System |
| GR | Gamma Ray |
| GSS | Gyro Single Shot |
| HAZOP | Hazard and Operability |
| HDT | High Resolution Dipmeter |
| HO | Hole Opener |
| HP/HT | High Pressure - High Temperature |
| HW/HWDP | Heavy Weight Drill Pipe |
| IADC | International Drilling Contractor |
| IBOP | Inside Blow Out Preventer |
| ID | Inside Diameter |
| IPR | Inflow Performance Relationship |
| JAM | Joint Make-up Torque Analyser |
| KMW | Kill mud weight |
| KOP | Kick Off Point |
| LAT | Lowest Astronomical Tide |
| LCM | Lost Circulation Materials |
| LOT | Leak Off Test |
| LQC | Log Quality Control |
| LTA | Lost Time Accident |
| LWD | Log While Drilling |
| MAASP | Max Allowable Annular Surface Pressure |
| MD | Measured Depth |
| MLH | Mudline Hanger |
| MLS | Mud Line Suspension |
| MMS | Magnetic Multi Shot |
| MODU | Mobile Offshore Drilling Unit |
| MOP | Margin of Overpull |
| MP | Magnetic Particle Inspection |
| MSL | Mean Sea Level |
| MSS | Magnetic Single Shot |
| MW | Mud Weight |
| MWD | Measurement While Drilling |
| NACE | National Association of Corrosion Engineers |
| NBS | Near Bit Stabiliser |
| NMDC | Non Magnetic Drill Collar |
| NSG | North Seeking Gyro |
| NTU | Nephelometric Turbidity Unit |
| OBM | Oil Base Mud |
| OD | Outside Diameter |
| OEDP | Open End Drill Pipe |
| OIM | Offshore Installation Manager |
| OMW | Original Mud weight |
| ORP | Origin Reference Point |
| OWC | Oil Water Contact |
| P&A | Plugged & Abandoned |
| PBR | Polished Bore Receptacle |
| PCG | Pipe Connection Gas |
| PDC | Polycrystalline Diamond Cutter |
| PDM | Positive Displacement Motor |
| PGB | Permanent Guide Base |
| PI | Productivity Index |
| PLT | Production Logging Tool |
| POB | Personnel On Board |
| PPB | Pounds Per Barrel |
| ppg | Pounds per Gallon |
| ppm | Part Per Million |
| PV | Plastic Viscosity |
| PVT | Pressure Volume Temperature |
| Q | Flow Rate |
| Q/AQ | Quality Assurance |
| RBP | Retrievable Bridge Plug |
| RFT | Repeat Formation Test |
| RJ | Ring Joint |
| RKB | Rotary Kelly Bushing |
| ROE | Radius of Exposure |
| ROP | Rate Of Penetration |
| ROU | Radius Of Uncertainty |
| ROV | Remote Operated Vehicle |
| RPM | Revolutions Per Minute |
| RT | Rotary Table |
| S (HDT) | High Resolution Dipmeter |
| S/N | Serial Number |
| SAFE | Slapper Activated Firing Equipment |
| SBHP | Static Bottom Hole Pressure |
| SBHT | Static Bottom Hole Temperature |
| SCC | Stress Corrosion Cracking |
| SCSSV | Surface Controlled Subsurface Safety Valve |
| SD | Separation Distance |
| SDE | Senior Drilling Engineer |
| SF | Safety Factor |
| SG | Specific Gravity |
| SICP | Shut-in Casing Pressure |
| SIDPP | Shut-in Drill Pipe Pressure |
| SIMOP | Simultaneous Operations |
| SPM | Stroke per Minute |
| SR | Separation Ratio |
| SRG | Surface Readout Gyro |
| SSC | Sulphide Stress Cracking |
| SSD | Sliding Sleeve Door Valve |
| SSSV | Sub Surface Safety Valve |
| ST | Steering Tool |
| STHP | Static Tubing Head Pressure |
| STHT | Static Tubing Head Temperature |
| S/L | Slick Line |
| STG | Short trip gas |
| TCP | Tubing Conveyed Perforations |
| TD | Total Depth |
| TFA | Total Flow Area |
| TG | Trip Gas |
| TGB | Temporary Guide Base |
| TOC | Top of Cement |
| TOL | Top of Liner |
| TRSV | Tubing Retrievable Safety Valve |
| TVD | True Vertical Depth |
| TW | Target Well |
| UAR | Uncertainty Area Ratio |
| UGF | Universal Guide Frame |
| UHF | Ultra High Frequency |
| UR | Under Reamer |
| VBR | Variable Bore Rams (BOP) |
| VDL | Variable Density Log |
| VHF | Very High Frequency |
| VSP | Velocity Seismic Profile |
| W/L | Wire Line |
| WBM | Water Base Mud |
| WC | Water Cut |
| WL | Water Loss |
| WHP | WellHead Pressure |
| WHSIP | WellHead Shut-in Pressure |
| WOB | Weight On Bit |
| WOC | Wait On Cement |
| WOW | Wait On Weather |
| WP | Working Pressure |
| X-mass | Wellhead Contorl Tree ( Chrismass Tree ) |
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