LEASES · O-9-15517 · OIL · DISTRICT 7C
Welch "12"
Diamondback E&P LLC · Upton County · Spraberry (Trend Area) field
Welch "12" is an RRC oil lease (O-9-15517) in Upton County operated by Diamondback E&P LLC, with 4 wells completed on it.
It has reported 128K barrels of oil and 220K mcf of gas since February 2004, last reporting volume in August 2026 (statewide data runs through August 2026).
It reported 772 barrels of oil in the 12 months through August 2026, up 40% on the year before; the lease peaked at 1.94K barrels in September 2005.
2 operators have filed production on it, most recently Diamondback E&P LLC since January 2025.
- 128K
- bbl oil, all reported
- 220K
- mcf gas incl. casinghead
- 772
- bbl oil, 12 months through Aug 2026
- +40%
- vs the 12 before
- 4
- wells completed on it
- 1.94K
- peak month, bbl (Sep 2005)
PDQ LEASE REPORTS · FIRST FEB 2004 · LAST VOLUME AUG 2026 · STATEWIDE DATA THROUGH AUG 2026
Oil by month
Barrels reported on Form PR for the whole lease. The latest months are revised upward as late reports arrive.
12 months through Aug 2026 772 · prior 12 552(+40%)
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.
12 months through Aug 2026 510 · prior 12 1,190(-57%)
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, with what it reported in them.
- Endeavor Energy Resources L.P.Jan 2004 → Dec 2024 · 252 mo127K bbl oil · 219K mcf gas
- Diamondback E&P LLCJan 2025 → Nov 2026 · 23 mo1.2K bbl oil · 1.21K mcf gas
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
4
wells completed on the lease
- Plugged
- 3
- 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 Aug 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-9-15517, documented in the API reference.