LEASES · O-10-55385 · OIL · DISTRICT 08
Rio Llano 11-10 A
ReportingDiamondback E&P LLC · Midland County · Spraberry (Trend Area) field
Rio Llano 11-10 A is an RRC oil lease (O-10-55385) in Midland County operated by Diamondback E&P LLC, with 3 wells completed on it.
It has reported 1.14M barrels of oil and 2.69M mcf of gas since January 2021, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 135K barrels of oil, down 24% on the year before; the lease peaked at 59K barrels in August 2021.
2 operators have filed production on it, most recently Diamondback E&P LLC since January 2025.
- 1.14M
- bbl oil, all reported
- 2.69M
- mcf gas incl. casinghead
- 135K
- bbl oil, last 12 reported
- -24%
- vs the 12 before
- 3
- wells completed on it
- 59K
- peak month, bbl (Aug 2021)
PDQ LEASE REPORTS · FIRST JAN 2021 · 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 134,680 · prior 12 176,383(-24%)
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 678,633 · prior 12 535,191(+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.
- Endeavor Energy Resources L.P.Jan 2021 → Dec 2024 · 48 mo
- Diamondback E&P LLCJan 2025 → Jul 2026 · 19 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
3
wells completed on the lease
- Shut IN
- 2
- Producing
- 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.
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