LEASES · O-10-20609 · OIL · DISTRICT 08
Harper Devonian Unit
ReportingOXY USA WTP EOR, LLC · Ector County · Harper (Devonian) field
Harper Devonian Unit is an RRC oil lease (O-10-20609) in Ector County operated by Oxy USA Wtp Eor, LLC, with 42 wells completed on it.
It has reported 2.33M barrels of oil and 16M mcf of gas since January 1993, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 27.3K barrels of oil, up 13% on the year before; the lease peaked at 13.2K barrels in March 2015.
3 operators have filed production on it, most recently Oxy USA Wtp Eor, LLC since May 2026.
- 2.33M
- bbl oil, all reported
- 16M
- mcf gas incl. casinghead
- 27.3K
- bbl oil, last 12 reported
- +13%
- vs the 12 before
- 42
- wells completed on it
- 13.2K
- peak month, bbl (Mar 2015)
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 27,341 · prior 12 24,143(+13%)
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 151,240 · prior 12 123,266(+23%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 118 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.
- 18%
- first-year decline from the peak (nominal Di 21%)
- 0.2
- b factor (hyperbolic)
- 0.86
- fit R²
- 159K
- 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 27,341 · prior 12 24,143(+13%)
Fitted hyperbolic 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 | 1,487 | 1,384 | 1,289 | 1,202 |
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.
- OXY USA Inc.Jan 1993 → Dec 2000 · 96 mo
- OXY USA WTP LPJan 2001 → Apr 2026 · 304 mo
- OXY USA WTP EOR, LLCMay 2026 → Jul 2026 · 3 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
42
wells completed on the lease
- Plugged
- 15
- Producing
- 12
- Shut IN
- 11
- Not on Schedule
- 4
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-10-20609, documented in the API reference.