A – B – C – D – E – F – G – H – I – J – K – L – M – N – O – P – R – S – T – U – V – W – X
| WOC | Wait on Cement |
| WOM | Wait(ing) on Material |
| WO/O | Waiting on Orders |
| WOW | Waiting on weather |
| WALKS | Walkaway Seismic Profile |
| WR | Walker Ridge Gulf of Mexico leasing area |
| WHRU | Waste heat recovery unit |
| WAG | Water Alternating Gas (describes an injection well which alternates between water and gas injection) |
| WATAN | Water Analysis |
| W/C | Water Cushion |
| W/C | Water cut |
| WD | Water depth |
| WF | Water Flooding |
| WGR | Water Gas Ratio |
| WGUNT | Water Gun Test |
| WI | Water Injection |
| WOC | Water Oil Contact (or Oil Water Contact) |
| WPC | Water Pollution Control |
| WQCA | Water Quality Control Act |
| WQCB | Water Quality Control Board |
| Sw | Water saturation |
| WSM | Water Shut Off |
| WUT | Water Up To |
| WBM | Water-based mud |
| WC | Watercut |
| WOR | Water-Oil Ratio |
| W | Watt |
| WFAC | Waveform Acoustic Log |
| WAVF | Waveform Log |
| WFT | Weatherford |
| Tare | Weight of empty container |
| WOB | Weight On Bit |
| WPQ/S | Weld Procedure Qualification/Specification |
| WPS | Welding procedure specification |
| WABAN | Well Abandonment Report |
| WAR | Well activity report |
| C&E | well completion and equipment cost |
| WCID | Well construction interface document |
| WCP | Well containment plan |
| WCST | Well containment screening tool |
| WPLAN | Well Course Plan |
| WELDA | Well Data Report |
| WE | Well Engineer |
| WEQL | Well Equipment Layout |
| T | well flowing to Tank |
| WGEO | Well Geophone Report |
| WH | Well History |
| WO | Well in Work Over |
| WELP | Well Log Plot |
| WLTS | Well Log Transaction System |
| WOA | Well Operations Authorization |
| WOE | Well Operations Engineer (a key person of Well services) |
| WPR | Well Prognosis Report |
| WP | Well Proposal or Working Pressure |
| WRS | Well Report Sepia |
| WSE | Well Seismic Edit |
| WSERE | Well Seismic Edit Report |
| WSP | Well Seismic Profile |
| WSSUR | Well Seismic Survey Plot |
| WSU | Well Service Unit |
| WSS | Well Services Supervisor (leader of Well services at the wellsite) |
| WSHT | Well Shoot |
| WSR | Well Shoot Report |
| WSCL | Well Site Core Log |
| WITS | Well Site Information Transfer System |
| WSL | Well Site Log |
| WSSAM | Well Site Sample |
| WSTL | Well Site Test Log |
| WSOG | Well Specific Operation Guidelines |
| WESTR | Well Status Record |
| WLSUM | Well Summary |
| WESUR | Well Summary Report |
| WT | Well Test |
| WVS | Well Velocity Survey |
| WBS | Wellbore schematic |
| WBS | Wellbore seismic |
| WBS | Wellbore stability |
| WH | Wellhead |
| WHFP | Wellhead flowing pressure |
| DAT | wellhead housing drill-ahead tool |
| WHM | Wellhead Maintenance |
| WHP | Wellhead pressure |
| WHCE | Wellhead/tree completion equipment |
| WC | West Cameron Area Gulf of Mexico leasing area |
| WD | West Delta Area Gulf of Mexico leasing area |
| WOS | West of Shetland, oil province on the UKCS |
| WTI | West Texas Intermediate (crude benchmark) |
| WFT | Wet film thickness |
| WGFM | Wet Gas Flow Meter |
| WMPI | Wet magnetic particle inspection |
| WR | Wet Resistivity |
| Wh | White |
| WHIG | Whitehouse Gauge |
| WCEP | Whooping Crane Eastern Partnership |
| WMA | Wildlife management area |
| WIPSP | WIP Stock Packer |
| WL | Wireline |
| WLC | Wireline Composite Log |
| WEG | Wireline Entry Guide |
| WLL | Wireline Logging |
| WR | Wireline Retrievable (as in a WR Plug) |
| WRSCSSV | Wireline Retrievable Surface Controlled Sub-Surface Valve |
| WI | Working Interest |
| WLL | Working load limit (WLL) |
| WSS | Working Spread Sheet (for logging) |
| W/O | Workover |
| WO | Workover |
| WORKO | Workover |
| WHMIS | WorkPlace Hazardous Material Information Systems |
| WTO | World Trade Organization |
| WCD | Worst-case discharge (scenario) |
| WSSOF | WSS Offset Profile |
| WSSVP | WSS VSP Raw Shots |
| WSSVS | WSS VSP Stacks |