LEASES · O-10-45474 · OIL · DISTRICT 08
Calverley 12
ReportingDiamondback E&P LLC · Glasscock County · Spraberry (Trend Area) field
Calverley 12 is an RRC oil lease (O-10-45474) in Glasscock County operated by Diamondback E&P LLC, with 5 wells completed on it.
It has reported 196K barrels of oil and 739K mcf of gas since June 2014, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 5.87K barrels of oil, down 16% on the year before; the lease peaked at 5.74K barrels in August 2014.
4 operators have filed production on it, most recently Diamondback E&P LLC since November 2019.
- 196K
- bbl oil, all reported
- 739K
- mcf gas incl. casinghead
- 5.87K
- bbl oil, last 12 reported
- -16%
- vs the 12 before
- 5
- wells completed on it
- 5.74K
- peak month, bbl (Aug 2014)
PDQ LEASE REPORTS · FIRST JUN 2014 · 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 5,869 · prior 12 7,011(-16%)
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 10,382 · prior 12 17,179(-40%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 113 reporting months of oil since the peak in Nov 2016. The dashed line below is that curve, drawn over the months it was fitted to and then 24 months past the last report; where it parts from the columns is where the model stops describing the lease. It describes the trend of past reports. It does not know about recompletions, shut-ins, or new wells, and it is shown only when the lease reported within the last year and the curve explains most of the history.
- 41%
- first-year decline from the peak (nominal Di 64%)
- 0.7
- b factor (hyperbolic)
- 0.79
- fit R²
- 58.9K
- bbl remaining on the curve, to 1 per month
Oil, barrels reported months since the peak, with the fitted curve and its projection
Last 12 months 5,869 · prior 12 7,011(-16%)
Fitted hyperbolic curve from the Nov 2016 peak, dashed 24 months past the last report
| Projected month | Oct 2026 | Apr 2027 | Oct 2027 | Apr 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 333 | 314 | 297 | 282 |
Quoting a projected figure as if it were reported would be wrong; the reported figures are the ones in the charts and the table view. How production is reported →
Who reported it
Each run of months one operator filed the production report, oldest first.
- Adventure Expl Partners II, LLCJun 2014 → Aug 2014 · 3 mo
- RSP Permian, LLCSep 2014 → Jul 2018 · 47 mo
- COG Operating LLCAug 2018 → Oct 2019 · 15 mo
- Diamondback E&P LLCNov 2019 → Jul 2026 · 81 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
5
wells completed on the lease
- Producing
- 2
- NO Type on File
- 1
- Shut IN
- 1
- 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-10-45474, documented in the API reference.