LEASES · O-10-40744 · OIL · DISTRICT 08
Grantham 12
ReportingDiamondback E&P LLC · Howard County · Spraberry (Trend Area) field
Grantham 12 is an RRC oil lease (O-10-40744) in Howard County operated by Diamondback E&P LLC, with 5 wells completed on it.
It has reported 253K barrels of oil and 761K mcf of gas since January 2011, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 2.75K barrels of oil, down 15% on the year before; the lease peaked at 4.73K barrels in July 2012.
2 operators have filed production on it, most recently Diamondback E&P LLC since June 2015.
- 253K
- bbl oil, all reported
- 761K
- mcf gas incl. casinghead
- 2.75K
- bbl oil, last 12 reported
- -15%
- vs the 12 before
- 5
- wells completed on it
- 4.73K
- peak month, bbl (Jul 2012)
PDQ LEASE REPORTS · FIRST JAN 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 2,752 · prior 12 3,221(-15%)
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 35,072 · prior 12 34,662(+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.
- Cobra Oil & Gas CorporationJan 2011 → May 2015 · 53 mo
- Diamondback E&P LLCJun 2015 → Jul 2026 · 134 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
5
wells completed on the lease
- Producing
- 3
- NO Type on File
- 1
- Shut IN
- 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-10-40744, documented in the API reference.