LEASES · O-11-67167 · OIL · DISTRICT 8A
West Spraberry Unit
ReportingJO Mill Oil Company LLC · Dawson County · Spraberry, W. (Deep, Spraberry) field
West Spraberry Unit is an RRC oil lease (O-11-67167) in Dawson County operated by JO Mill Oil Company LLC, with 59 wells completed on it.
It has reported 4.13M barrels of oil and 808K mcf of gas since December 1993, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 38K barrels of oil, down 16% on the year before; the lease peaked at 29.5K barrels in December 1996.
3 operators have filed production on it, most recently JO Mill Oil Company LLC since October 2020.
- 4.13M
- bbl oil, all reported
- 808K
- mcf gas incl. casinghead
- 38K
- bbl oil, last 12 reported
- -16%
- vs the 12 before
- 59
- wells completed on it
- 29.5K
- peak month, bbl (Dec 1996)
PDQ LEASE REPORTS · FIRST DEC 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 38,014 · prior 12 45,176(-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 0 · prior 12 0
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 115 reporting months of oil since the peak in Oct 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.
- 11%
- first-year decline from the peak (nominal Di 12%)
- 1.1
- b factor (hyperbolic)
- 0.80
- fit R²
- 948K
- 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 38,014 · prior 12 45,176(-16%)
Fitted hyperbolic curve from the Oct 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 | 3,114 | 3,035 | 2,959 | 2,887 |
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.
- Texaco E & P Inc.Dec 1993 → May 2002 · 102 mo
- Chevron U. S. A. Inc.Jun 2002 → Sep 2020 · 220 mo
- JO Mill Oil Company LLCOct 2020 → Jul 2026 · 70 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
59
wells completed on the lease
- NO Type on File
- 26
- Plugged
- 20
- Injection
- 7
- Producing
- 3
- Shut IN
- 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-11-67167, documented in the API reference.