The top 25 oil and gas operators in Bexar County, Texas, ranked by monthly oil production. Combined output: 348,961 BBL oil and 4,620 Mcf gas across 152 reporting wells/leases.
| Rank | Operator | Oil (BBL) | Gas (Mcf) | Wells |
|---|---|---|---|---|
| 1 | Mdf Oil Company | 167,444 | 0 | 1 |
| 2 | South Sam Operating Company | 60,172 | 0 | 4 |
| 3 | Koko Skadi LLC | 23,855 | 0 | 26 |
| 4 | Red Chalk Resources | 23,256 | 0 | 4 |
| 5 | Calfas Oil LLC | 8,227 | 0 | 8 |
| 6 | Seeker Oil Company Incorporated | 7,939 | 0 | 13 |
| 7 | Old Chief Oil, LLC | 7,687 | 0 | 3 |
| 8 | Production Resources | 7,519 | 0 | 3 |
| 9 | Mojave Resources LLC | 6,559 | 0 | 10 |
| 10 | Jm Calk Operating LLC | 6,086 | 0 | 5 |
| 11 | Drachen Oil Company | 4,193 | 0 | 16 |
| 12 | Texas Secondary Oil | 3,699 | 0 | 6 |
| 13 | Calk Roger D | 3,067 | 0 | 17 |
| 14 | Petro Lions | 2,909 | 0 | 7 |
| 15 | Calk Operating | 2,711 | 0 | 2 |
| 16 | Brander Sam H | 2,532 | 0 | 4 |
| 17 | Calk Oil Company | 1,905 | 0 | 7 |
| 18 | Downing Well Service, Inc | 1,535 | 0 | 3 |
| 19 | Sorto Peters God | 1,377 | 0 | 1 |
| 20 | Burlington Resources Oil & Gas Company | 1,329 | 4,620 | 1 |
| 21 | Jamco Oil | 1,294 | 0 | 2 |
| 22 | Drachen Energy Company | 1,153 | 0 | 2 |
| 23 | Mandujano Alfonso Jr | 870 | 0 | 1 |
| 24 | Paisano Production | 857 | 0 | 3 |
| 25 | Gonzalez Eugene Jr | 786 | 0 | 3 |