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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Oilfield Search | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Mar 1990 |
| Oilfield Services, LLC | Kansas | 0 BBLs | 0 MCF | Jan 1981 - Nov 2017 |
| Oilfield Truck Service | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Jun 2014 |
| Oilwell Equipmen | Kansas | 0 BBLs | 0 MCF | Oct 1982 - Dec 1994 |
| Oilwell Operator | Kansas | 0 BBLs | 0 MCF | Sep 1983 - Dec 1994 |
| Oj Oil & Gas, Inc. | Kansas | 0 BBLs | 0 MCF | May 1989 - Oct 1991 |
| Ojc Oil Company | Kansas | 0 BBLs | 0 MCF | Mar 1981 - Jul 1985 |
| Ok Discoveries I | Kansas | 0 BBLs | 0 MCF | May 1987 - May 1987 |
| Oklahoma Energy | Kansas | 0 BBLs | 0 MCF | Sep 1982 - Nov 1985 |
| Oklahoma Energy & Exploration, Inc. | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Jan 1996 |
| Oklahoma Oil & G | Kansas | 0 BBLs | 0 MCF | Feb 1980 - May 1993 |
| Oklahoma Rig & Salvage, Inc. | Kansas | 0 BBLs | 0 MCF | Dec 1982 - Jan 1996 |
| Okmar Oil Co | Kansas | 0 BBLs | 0 MCF | Apr 1980 - Jun 1984 |
| Okmar Oil Compan | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Feb 1995 |
| Okt Resources, LLC | Kansas | 0 BBLs | 0 MCF | Jul 1984 - Nov 2009 |
| Ol' Oily LLC | Kansas | 154 BBLs | 0 MCF | Feb 2020 - Jul 2024 |
| Olak Energy Production, LLC | Kansas | 0 BBLs | 0 MCF | Mar 2010 - Nov 2019 |
| Olander John D | Kansas | 0 BBLs | 0 MCF | Aug 1983 - Dec 1994 |
| Ole B S Oil Comp | Kansas | 0 BBLs | 0 MCF | Aug 1984 - Sep 1987 |
| Oleum Incorporat | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Dec 1990 |
| Olsen, Melvin L. | Kansas | 0 BBLs | 0 MCF | Oct 1983 - Sep 1994 |
| Olson D Producti | Kansas | 0 BBLs | 0 MCF | May 1981 - Jul 1994 |
| Olson-Anderson Lease | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Mar 2018 |
| Olympic Oil, Inc. | Kansas | 0 BBLs | 0 MCF | Feb 1980 - May 2024 |
| Olympic Petroleu | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Jul 1993 |
| Omega Enterprise | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Sep 1990 |
| Omega Minerals I | Kansas | 0 BBLs | 0 MCF | Nov 1984 - Mar 1985 |
| One Source Financial Services Inc. | Kansas | 0 BBLs | 0 MCF | Dec 1987 - Dec 2019 |
| One Way Incorpor | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Oct 1989 |
| Oneok Bushton Proces | Kansas | 0 BBLs | 0 MCF | Apr 2005 - Mar 2007 |
| Oneok Energy Service | Kansas | 0 BBLs | 0 MCF | Jan 2006 - Dec 2008 |
| Oneok Exploratio | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Mar 1995 |
| Oneok Field Services Company | Kansas | 0 BBLs | 0 MCF | Apr 2003 - Jul 2006 |
| Oneok Gas Processing, L.L.C. | Kansas | 0 BBLs | 0 MCF | Nov 2000 - Mar 2004 |
| Oneok Resources Company | Kansas | 0 BBLs | 0 MCF | Jan 1983 - Mar 2013 |
| Onnen, Gerhard E. | Kansas | 0 BBLs | 0 MCF | Oct 1980 - Feb 2002 |
| Onshore, L.L.C. | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Dec 2009 |
| Onyxx Oil Corpor | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Jul 1992 |
| Oolite Energy Corp | Kansas | 0 BBLs | 0 MCF | Jul 2009 - Apr 2022 |
| Opco LLC | Kansas | 0 BBLs | 0 MCF | Aug 2012 - Dec 2019 |
| Opdycke Lease Partners, A General Partnership | Kansas | 330 BBLs | 0 MCF | Jan 1980 - Jul 2024 |
| Opef Partnership, A General Partnership | Kansas | 0 BBLs | 0 MCF | Apr 1983 - Dec 2011 |
| Opo Investments | Kansas | 0 BBLs | 0 MCF | Apr 1982 - Sep 1984 |
| Opubco Resources | Kansas | 0 BBLs | 0 MCF | Jan 1980 - May 1985 |
| Orbit Energy LLC | Kansas | 0 BBLs | 0 MCF | May 2008 - May 2008 |
| Orca Operating Company LLC | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Aug 2015 |
| Orion Energy Of | Kansas | 0 BBLs | 0 MCF | Jan 1986 - Jan 1986 |
| Orion Incorporat | Kansas | 0 BBLs | 0 MCF | Aug 1985 - Jan 1987 |
| Oryx Energy Comp | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Apr 1991 |
| Oryx Energy Company | Kansas | 0 BBLs | 0 MCF | Jan 1980 - May 2002 |