LEASES · O-11-64619 · OIL · DISTRICT 8A
Wellman West Unit
ReportingWhite Rock Oil & Gas, LLC · Terry County and Yoakum · Wellman, W. (San Andres) field
Wellman West Unit is an RRC oil lease (O-11-64619) in Terry County operated by White Rock Oil & Gas, LLC, with 45 wells completed on it.
It has reported 2.04M barrels of oil and 460K mcf of gas since January 1993, last reporting volume in March 2026 (statewide data runs through April 2026).
The last 12 reported months total 13.8K barrels of oil, down 22% on the year before; the lease peaked at 13.2K barrels in May 2003.
6 operators have filed production on it, most recently White Rock Oil & Gas, LLC since January 2019.
- 2.04M
- bbl oil, all reported
- 460K
- mcf gas incl. casinghead
- 13.8K
- bbl oil, last 12 reported
- -22%
- vs the 12 before
- 45
- wells completed on it
- 13.2K
- peak month, bbl (May 2003)
PDQ LEASE REPORTS · FIRST JAN 1993 · LAST VOLUME MAR 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 13,774 · prior 12 17,714(-22%)
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 2,005 · prior 12 2,187(-8%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 109 reporting months of oil since the peak in Mar 2017. 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.
- 8%
- first-year decline from the peak (nominal Di 9%)
- 0.4
- b factor (hyperbolic)
- 0.71
- fit R²
- 265K
- 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 13,774 · prior 12 17,714(-22%)
Fitted hyperbolic curve from the Mar 2017 peak, dashed 24 months past the last report
| Projected month | Oct 2026 | Apr 2027 | Oct 2027 | Apr 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 1,202 | 1,162 | 1,125 | 1,089 |
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.
- Santa FE Energy Oper. Part., LPJan 1993 → Dec 1994 · 24 mo
- Santa FE Energy Resources, Inc.Jan 1995 → Oct 1999 · 58 mo
- Santa FE Snyder CorporationNov 1999 → Oct 2000 · 12 mo
- Devon SFS Operating, Inc.Nov 2000 → Oct 2002 · 24 mo
- Devon Energy Production Co, L.P.Nov 2002 → Dec 2018 · 194 mo
- White Rock Oil & Gas, LLCJan 2019 → Jul 2026 · 91 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
45
wells completed on the lease
- NO Type on File
- 35
- Plugged
- 6
- Producing
- 3
- 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-11-64619, documented in the API reference.