- Well 2 Web Inc
- Well Completions
- Well Contracting Pumping
- Well Control
- Well Pro
- Well Testing
- Well-Data Svc
- Well-Site Management
- Wellflow Production Enhancment
- Wellhead Equipment Div
- Wellhead Inc
- Wellhead Inc
- Wellhead Inc
- Wellhead Specialties Eqpt
- Wellkeeper
- Wells Oil Field Svc
- Wells Oil Field Svc
- Wellserv
- Wellsite Geology
- Welltec Inc
- Welltec Inc
- Welltech Inc
- WELS LTD
- Welter Consulting Inc
- Werth Tank Svc
- Wes-Tex Services
- Wes-Tex Vacuum Svc
- Wesco Electric Inc
- West American Energy Corp
- West Coast Casing Co
- West Coast Logistics
- West Drilling & Completion Inc
- West Hou Inc
- West Ok Trucking
- West OK Trucking Inc
- West Texas Environmental Inc
- West Texas Weedwash
- West Virginia Oil Gathering
- Westates Casing Svc
- Western Atlas Intl
- Western Compressor Svc Co
- Western Hot Oil Svc
- Western Hot Oil Svc
- Western Hull
- Western Nebraska Land Svc
- Western Oil Transportation Co
- Western Plans Enterprises
- Western Specialized Svc
- Western Tank Trucks Inc
- Western Well Svc
- Western Wireline Inc
- Western X-Ray
- Westex Systems Inc
- Westoak Production Svc Inc
- Westport Resources Oil Field
- Westside Machine Shop Inc
- Wet Tech Energy
- Wetern Co Of North America
- Wgps Production Systems LP
- Where Check USA
- Whitaker Oil Tools
- White Horse Maintenance Inc
- White Horse Maintenance Inc
- White Resources Inc
- White Tail Oil Field Svc
- White Wing Inspection
- Wiggins Oil Tool Co Inc
- Wiggins Oil Tool Co Inc
- WIL Tech
- WIL-Tech Automation
- Wilbanks Trucking Inc
- Wilco Marsh Buggies Inc
- Wilcoxen Packer & Supply
- Wilcrest Field Svc
- Wild Horse Tank Trucks
- Wild West Oil Field Svc
- Wild West Well Svc
- Wildcat Drilling Svc
- Wildcat Fabrications
- Wildcat Measurement Svc
- Wildcat Oilfield Svc Inc
- Wildcat Services
- Wildcat Services
- Wildhorse Services
- Wiley's Lease Svc
- Will's Electrical Svc
- Williams Field Svc
- Williams Field Svc
- Williamson Production Svc
- Willie's Dirt Svc
- Willies Dirt Svc Inc
- Willies Hot Oil
- Willies Hot Oil Svc Inc
- Willies Well Svc
- Williston Basin Inspection Svc
- Wilson ALS
- Wilson Service Co
- Wilson Supply
- Wilson Supply Co
- Wilson Supply Co
- Wilson Supply Co
- Win-Tex Lease Svc
- Wind River Oil Field Svc
- Wind River Oilfield Svc
- Windham & Sons Inc
- Windriver Cathodic & Environ
- Wingrove Well Svc Inc
- Winkel & Son Construction
- Winter Mud Co
- Wire Brothers
- Wireline Inc
- Wireline International
- Wireline Repair Svc
- Wireline Technologies
- Wishco Oil & Svc
- Without Walls Arena & Barn
- Wolf Electric Inc
- Wolf Oil Field Svc
- Wolff Oilfield Svc
- Wollison Services
- Wolsey Well Svc Inc
- Wood Group Esp
- Wood Group Loggin Svc
- Wood Group Loggin Svc
- Wood Group Loggin Svc
- Wood Group Logging Svc
- Wood Group Logging Svc-Texas
- Wood Group Pressure Control
- Wood Group Pressure Control
- Wood Group Production Svc
- Wood Group Productions Svc
- Wood Group Wire Line
- Wood Group Wireline
- Wood Group Wireline Svc
- Wood Oilfield Svc
- Wood's Rig Leveling
- Woodbine Well Testing Co
- Woodgroup ESP Inc
- Woody's Pipe & Supply
- Wooldridge Oil Co Inc
- Work Over Specialities
- World Star Development Inc
- Worldwide Professional
- Worldwide Professional Svc
- Wrangler Well Svc
- Wren Oilfield Svc
- Wright Trucking Inc
- Wsi
- WSI
- WSI Machine & Supply
- WYCO
- Wyoming Casing Svc
- Wyoming Casing Svc
- Wyoming Casing Svc Inc
- Wyoming Drill Collar Svc
- Wyoming Pipe & Tool Corp
- X L Hardbanding
- X L Hardbanding Svc
- X-Pert Service Tools
- X-Tra Oil Field & Construction
- Xterra Fishing & Rental Tool
- Xtreme Pressure Svc
- Yandell Well Svc
- Yegua Oil Field Svc Inc
- Yellow Rose Hot Shot
- York Enterprises
- Young Tool Co
- Z & S Construction Co Inc
- Z & S Construction Co Inc
- Z-Line Specialities
- Zack's Pipe Testing
- Zane's Oil Field Svc
- Zapata Hotshot
- Zapata International
- Zerbst's Pumping Svc
- Zia Lact & Controls
- Zia Transport
- Zimmer Engine Svc Inc
- Zimmerman Equipment Co
- Zubiate Hot Oil
