LEASES · O-10-43780 · OIL · DISTRICT 08
Cotham 21
ReportingDiamondback E&P LLC · Dawson County · Spraberry (Trend Area) field
Cotham 21 is an RRC oil lease (O-10-43780) in Dawson County operated by Diamondback E&P LLC, with one well completed on it.
It has reported 30.3K barrels of oil and 9.99K mcf of gas since February 2013, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 651 barrels of oil, down 35% on the year before; the lease peaked at 1.24K barrels in May 2013.
2 operators have filed production on it, most recently Diamondback E&P LLC since October 2013.
- 30.3K
- bbl oil, all reported
- 9.99K
- mcf gas incl. casinghead
- 651
- bbl oil, last 12 reported
- -35%
- vs the 12 before
- 1
- wells completed on it
- 1.24K
- peak month, bbl (May 2013)
PDQ LEASE REPORTS · FIRST FEB 2013 · 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 651 · prior 12 996(-35%)
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 167 · prior 12 252(-34%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps exponential curve fitted to the 115 reporting months of oil since the peak in Jul 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.
- 13%
- first-year decline from the peak (nominal Di 14%)
- 0.0
- b factor (exponential)
- 0.74
- fit R²
- 4.89K
- 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 651 · prior 12 996(-35%)
Fitted exponential curve from the Jul 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 | 53 | 50 | 47 | 43 |
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.
- Element Petro Operating II, LLCFeb 2013 → Sep 2013 · 8 mo
- Diamondback E&P LLCOct 2013 → Jul 2026 · 154 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
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-10-43780, documented in the API reference.