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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Ward-Williston Drilling Co. | North Dakota | 0 BBLs | 0 MCF | Jan 1953 - Apr 1983 |
| Wesco Operating, Inc. | North Dakota | 7,397 BBLs | 6,017 MCF | Aug 1987 - Mar 2024 |
| Wessely Energy Co. | North Dakota | 0 BBLs | 0 MCF | Feb 1985 - Jan 1987 |
| Westport Oil & Gas Company, L.P. | North Dakota | 0 BBLs | 0 MCF | Jul 1998 - Feb 2007 |
| White Butte Oil Operations, LLC | North Dakota | 16,877 BBLs | 68,118 MCF | Apr 2015 - Feb 2024 |
| White Rock Oil & Gas, LLC | North Dakota | 91,974 BBLs | 94,062 MCF | Sep 2015 - Feb 2024 |
| Whiting Oil And Gas Corporation | North Dakota | 1,899,525 BBLs | 6,588,077 MCF | Jun 2002 - Feb 2024 |
| Whiting Petroleum Corporation | North Dakota | 0 BBLs | 0 MCF | May 2000 - Feb 2006 |
| William Herbert Hunt | North Dakota | 0 BBLs | 0 MCF | May 1954 - Mar 1986 |
| Williston Exploration, LLC | North Dakota | 0 BBLs | 0 MCF | Feb 2012 - Oct 2018 |
| Williston Hunter ND, LLC | North Dakota | 0 BBLs | 0 MCF | Apr 2012 - Mar 2014 |
| Williston Industrial Supply Corporation | North Dakota | 0 BBLs | 0 MCF | Apr 1993 - Mar 2012 |
| Williston Tank Rental, Inc. | North Dakota | 0 BBLs | 0 MCF | Dec 1985 - Aug 1987 |
| Windridge Operating LLC | North Dakota | 1,169 BBLs | 8,841 MCF | Jul 2017 - Feb 2024 |
| Windsor Energy Group, L.L.C. | North Dakota | 0 BBLs | 0 MCF | Aug 2008 - Sep 2017 |
| Wiser Oil Co. | North Dakota | 0 BBLs | 0 MCF | Mar 1977 - Jun 1991 |
| WPX Energy Williston, LLC | North Dakota | 1,934,014 BBLs | 4,085,112 MCF | Apr 2011 - Feb 2024 |
| Wyoming Resources Corporation | North Dakota | 0 BBLs | 0 MCF | Jul 1989 - May 2008 |
| XTO Energy Inc | North Dakota | 2,456,296 BBLs | 6,522,981 MCF | Jun 2007 - Feb 2024 |
| Zargon Oil (ND) Inc. | North Dakota | 8,710 BBLs | 317 MCF | Jul 2002 - Feb 2024 |
| Zavanna, LLC | North Dakota | 173,874 BBLs | 623,873 MCF | Apr 2007 - Feb 2024 |
| Zenergy Operating Company, LLC | North Dakota | 0 BBLs | 0 MCF | Apr 2009 - Mar 2011 |
| Zenergy, Inc | North Dakota | 0 BBLs | 0 MCF | Nov 2005 - Nov 2013 |
| Zinke & Trumbo, Inc. | North Dakota | 0 BBLs | 0 MCF | Jul 2000 - Oct 2005 |