- Walter Kuhn Drilling Co
- Walter Oil & Gas
- Walthall Oil
- Walthall Oil Co
- Walton Oil Co
- Wappingers Oil
- Wappingers Oil
- Ward Oil Co
- Ward-Williston Co
- Ware House Industries
- Waring Oil Co
- Warncke Glennwood Drilling
- Warren American Oil Co
- Warren Oil
- Warren Oil
- Warren Oil & Gas Co
- Warren Oil Co
- Warren Oil Co
- Warren Oil Co Inc
- Warrenton Oil Co
- Warrior Resources Inc
- Wascana Oil & Gas Inc
- Wat Tyler Oil
- Wayne Harper
- Wayne Hogan Oil Co
- Wayne Oil
- Wayne R Grewing Oil & Gas
- Wayne Stokes Productions
- Wbd Oil & Gas Inc
- Wbd Oil & Gas Inc
- WCS Oil & Gas Corp
- WDW Operators Inc
- We Oil Co Inc
- Weatherford
- Weatherford Completion Systems
- WEBB Oil Co
- WEBB Oil Co
- Wehman Inc Metro Line Oil
- WEIS Oil Co
- Weiser Brown Oil Co
- Weisser Oil
- Wel-Co
- Wells Oil Co
- Welsh Oil Inc Warehouse
- Wentz Oil Co
- Werts Oil Co
- Werts Oil Co
- Werts Oil Co
- Wes-Tex Drilling Co
- Wes-Tex Drilling Co
- Wesco Investments Inc
- Wesco Oil Co
- Wesco Operating Inc
- Wesgra Corp
- Wesley E Pittman
- Wesley Senkel Inc
- Wesley Senkel Inc
- West Monroe Gas Gathering
- West Oil Co
- West Port Oil & Gas
- West Texas Gas
- West Virginia Oil Gathering
- Westar Oil & Gas Dev Inc
- Westbrook Oil Corp
- Westchester Gas Co
- Westchester Gas Co Hanger
- Western Continental Operating
- Western Gas Resources Inc
- Western General Inc
- Western Minerals & Oil LLC
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- Western Oil Co
- Western Oil Producers
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- Western Pride Resources Inc
- Western Resource Development
- Western Service Co
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- Western States Operating Co
- Westkaz Oil Co
- Westmoreland Co
- Weston Oil Co
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- Westport Oil & Gas
- Westport Oil & Gas Co
- Westport Oil & Gas Co
- Westport Oil & Gas Co Inc
- Westridge Oil & Gas
- WFD Oil Corp
- WGH Total Oil Well Svc
- WGS Properties Inc
- Whaleco Oil Co
- Whaleco-Campbell & Pratt Oil
- Wheatley Oil Co
- Wheeler & Sons Oil & Gas
- Wheeler Oil Co
- Wheeler Oil Inc Shop
- Wheelock Oil Co
- Whetstone Oil Co
- White Eagle Resources Corp
- White Energy Inc
- White Hawk Oil Co
- White Hawk Oil Co
- White Land & Mineral
- White Land & Mineral
- White Mountain Oil & Propane
- White Oak Operating Co
- White Operating Co
- White Operating Co
- Whitewater Resources
- Whiting Oil & Gas
- Whiting Oil & Gas
- Whiting Oil & Gas Inc
- Whiting Oil Co Inc
- Whiting Petroleum
- Whiting Petroleum
- Whiting Petroleum
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
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- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whiting Petroleum Corp
- Whitley Oil 5
- Whitman's Oil Co
- Whitten Oran O Oil Co
- WHM Oil Co Inc
- Wichita River Oil Corp
- Wichita River Oil Corp
- Wichita River Oil Corp
- Wiegand Oil Co Inc
- Wilco Energy Corp
- Wilco Energy Corp
- Wilcox & Flegel
- Wilcox & Flegel Oil Co
- Wilcox Energy Co
- Wild Cat Operating Co
- Will O Oil & Gas
- Will O Oil & Gas
- Will-Drill Production Co Inc
- Willard Oil Co Inc
- Willco Oil Tools
- Willco Oil Tools 2nd Line
- William G Helis Estate
- William Gruenerwald & Assoc
- William H Mc Arthur Jr Inc
- William Hells Estate
- William Noll Natural Gas
- William Putnam Oil & Gas
- William R Leer Oil & Gas
- William R Leer Oil & Gas
- William's Oil Co
- Williams Co
- Williams Co
- Williams Field Svc
- Williams Field Svc
- Williams Gas & Energy
- Williams Natural Gas Liquids
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- Williams Oil Co Inc
- Williams Petroleum Co
- Williams Petroleum Co
- Williams Prod & Exploration
- Williams Production Rmt
- Williamson Oil Co
- Williford Energy Co
- Williford Energy Co
- Williford Energy Co
- Willis Brothers Land & Cattle
- Willis Operating Co
- Willis Operating Co
- Williston Basin Pipeline
- Willoco
- Willow Creek Resources
- Wills Oil Co
- Wills Oil Co
- Wilson Oil Co LTD
- Wilson Supply Co
- Wilson Systems Inc
- Wilson Well Svc Inc
- Winan's S Oil Inc
- Winchester Production Co
- Winco Oil
- Windsor Associates Inc
- Wingert Oil Co
- Winkler Acquisition
- Winston Oil Co
- Wisdom Oil Co
- Wise Oil Co
- Wiser Oil Co
- WITT Oil Production Inc
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- WJH Energy Inc
- Wo Operating Co
- WOLD Oil & Gas Co
- WOLD Oil Properties
- WOLD Oil Properties Inc
- Wolf Creek Oil & Gas Land Svc
- Wolf Creek Oil Co
- Wood Energy Inc
- Wood Energy Inc
- Wood Energy Inc
- Wood Oil
- Woodfin Oil Co Chester Mdlthn
- Woodruff Energy
- Wooldridge Productions
- Woolridge Production
- Wooten Oil Co
- Wooten Oil Co
- Workman Oil
- World Oil
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- World Petro Inc
- World Producers
- Wortham Operating
- Wortham Operating
- Wotachek Oil Co
- Wright's Oil Svc
- WTP Energy Inc
- Wyatt Oil Co Inc
- Wyatt's Oil Corp
- WYNN Crosby 1995 LTD
- Wynot Oil Co
- Wynot Oil Co
- Wyoming Oil Well Cementers
- X L Operating Co
- X To Energy
- Xenon Energy Corp
- Xenon Energy Corp
- Xoil Inc
- Xpo Energy
- Xtend Oil Well Svc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
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- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
- Xto Energy Inc
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- Xto Energy Inc
- Xto Energy Inc
- XTO Energy Inc
- Xto Energy Inc
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- Yale Oil Assn
- Yankee Oil
- Yates Drilling
- Yates Petroleum
- Yates Petroleum Corp
- Yaw Oil Co
- Yockey Oil Inc
- Yocom Oil Co Inc
- Yocum Oil Co Inc
- Yoder Oil Co
- Yorba Oil Co LTD
- Young Living Essential Oil
- Young Living Essential Oil
- Young Oil Co
- Young Oil Co Inc
- Young Oil Tools Inc
- Younger Energy Co
- Youtsey Petroleum Inc
- Yust Enterprises
- Z & Z Oil Svc Inc
- Z K Petroleum
- Zargon Oil
- Zia Natural Gas
- Zion Oil & Gas
- Zogg Oil Co
