LEASES · O-10-49497 · OIL · DISTRICT 08
The Sphinx
ReportingU.S. Energy Development Corp · Reeves County · Wolfbone (Trend Area) field
The Sphinx is an RRC oil lease (O-10-49497) in Reeves County operated by U.S. Energy Development Corp, with 8 wells completed on it.
It has reported 3.41M barrels of oil and 14M mcf of gas since November 2017, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 131K barrels of oil, down 7% on the year before; the lease peaked at 119K barrels in November 2018.
2 operators have filed production on it, most recently U.S. Energy Development Corp since April 2025.
- 3.41M
- bbl oil, all reported
- 14M
- mcf gas incl. casinghead
- 131K
- bbl oil, last 12 reported
- -7%
- vs the 12 before
- 8
- wells completed on it
- 119K
- peak month, bbl (Nov 2018)
PDQ LEASE REPORTS · FIRST NOV 2017 · 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 131,151 · prior 12 140,678(-7%)
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 1,190,804 · prior 12 1,206,852(-1%)
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.
- COG Operating LLCNov 2017 → Mar 2025 · 89 mo
- U.S. Energy Development CorpApr 2025 → Jul 2026 · 16 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
8
wells completed on the lease
- Producing
- 8
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-10-49497, documented in the API reference.