LEASES · O-11-66037 · OIL · DISTRICT 8A
Robertson (San Andres) Unit
ReportingOccidental Permian EOR, LLC · Gaines County · Robertson, N. (San Andres) field
Robertson (San Andres) Unit is an RRC oil lease (O-11-66037) in Gaines County operated by Occidental Permian Eor, LLC, with 73 wells completed on it.
It has reported 4.68M barrels of oil and 1.65M mcf of gas since January 1993, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 28.5K barrels of oil, up 8% on the year before; the lease peaked at 30.5K barrels in July 2001.
4 operators have filed production on it, most recently Occidental Permian Eor, LLC since May 2026.
- 4.68M
- bbl oil, all reported
- 1.65M
- mcf gas incl. casinghead
- 28.5K
- bbl oil, last 12 reported
- +8%
- vs the 12 before
- 73
- wells completed on it
- 30.5K
- peak month, bbl (Jul 2001)
PDQ LEASE REPORTS · FIRST JAN 1993 · 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 28,531 · prior 12 26,404(+8%)
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 6,943 · prior 12 8,905(-22%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps exponential curve fitted to the 113 reporting months of oil since the peak in Dec 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.
- 14%
- first-year decline from the peak (nominal Di 15%)
- 0.0
- b factor (exponential)
- 0.80
- fit R²
- 138K
- 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 28,531 · prior 12 26,404(+8%)
Fitted exponential curve from the Dec 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 | 1,552 | 1,443 | 1,342 | 1,248 |
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.
- Shell Western E&P Inc.Jan 1993 → Feb 1997 · 50 mo
- Altura Energy Ltd.Mar 1997 → Apr 2000 · 38 mo
- Occidental Permian Ltd.May 2000 → Apr 2026 · 312 mo
- Occidental Permian EOR, LLCMay 2026 → Jul 2026 · 3 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
73
wells completed on the lease
- NO Type on File
- 35
- Producing
- 23
- Shut IN
- 6
- Plugged
- 6
- Injection
- 3
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-11-66037, documented in the API reference.