LEASES · O-1-15638 · OIL · DISTRICT 01
Middle McCowen
ReportingMarathon Oil EF LLC · Atascosa County and McMullen · Eagleville (Eagle Ford-1) field
Middle Mccowen is an RRC oil lease (O-1-15638) in Atascosa County operated by Marathon Oil EF LLC, with 125 wells completed on it.
It has reported 30.4M barrels of oil and 24.8M mcf of gas since August 2011, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 4.28M barrels of oil, down 28% on the year before; the lease peaked at 819K barrels in June 2024.
2 operators have filed production on it, most recently Marathon Oil EF LLC since November 2011.
- 30.4M
- bbl oil, all reported
- 24.8M
- mcf gas incl. casinghead
- 4.28M
- bbl oil, last 12 reported
- -28%
- vs the 12 before
- 125
- wells completed on it
- 819K
- peak month, bbl (Jun 2024)
PDQ LEASE REPORTS · FIRST AUG 2011 · LAST VOLUME APR 2026 · STATEWIDE DATA THROUGH APR 2026
Oil by month
Barrels reported on Form PR for the whole lease. The latest months are revised upward as late reports arrive.
Last 12 months 4,281,756 · prior 12 5,967,262(-28%)
Gas by month
Gas-well gas plus casinghead gas, mcf. On an oil lease all gas is reported as casinghead. The latest months are revised upward as late reports arrive.
Last 12 months 3,027,282 · prior 12 4,175,011(-27%)
Decline curve
None shown. Petrora fits an Arps curve only when the last ten years of oil reports follow one decline closely enough to project (R² of 0.7 or better over at least a year since the peak). This lease's recent history does not, so a projection would be a guess dressed as a number.
Who reported it
Each run of months one operator filed the production report, oldest first.
- Hilcorp Energy CompanyAug 2011 → Oct 2011 · 3 mo
- Marathon Oil EF LLCNov 2011 → Jul 2026 · 177 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
125
wells completed on the lease
- Producing
- 102
- Shut IN
- 15
- Injection
- 4
- NO Type on File
- 3
- Plugged
- 1
Operates them now
About this data
Monthly oil, gas, and casinghead from the RRC PDQ production dump, which lags the reporting month by two to three months; figures shown through Apr 2026. Wells from completion reports; operator runs from who filed each month's report.
Developers: this page as JSON is GET /v1/data/leases/tx/o-1-15638, documented in the API reference.