LEASES · O-10-20638 · OIL · DISTRICT 08
Nix-South Unit
ReportingMontare Operating, Ltd. · Andrews County · Nix, South field
Nix-South Unit is an RRC oil lease (O-10-20638) in Andrews County operated by Montare Operating, Ltd., with 17 wells completed on it.
It has reported 131K barrels of oil and 94.3K mcf of gas since January 1993, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 665 barrels of oil, down 20% on the year before; the lease peaked at 2.39K barrels in August 2011.
8 operators have filed production on it, most recently Montare Operating, Ltd. since August 2021.
- 131K
- bbl oil, all reported
- 94.3K
- mcf gas incl. casinghead
- 665
- bbl oil, last 12 reported
- -20%
- vs the 12 before
- 17
- wells completed on it
- 2.39K
- peak month, bbl (Aug 2011)
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 665 · prior 12 829(-20%)
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 407 · prior 12 623(-35%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 83 reporting months of oil since the peak in Apr 2019. 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.
- 45%
- first-year decline from the peak (nominal Di 65%)
- 0.3
- b factor (hyperbolic)
- 0.73
- fit R²
- 2.99K
- 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 665 · prior 12 829(-20%)
Fitted hyperbolic curve from the Apr 2019 peak, dashed 24 months past the last report
| Projected month | Oct 2026 | Apr 2027 | Oct 2027 | Apr 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 45 | 39 | 35 | 31 |
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.
- Jaxploration Company L.C.Jan 1993 → Aug 1993 · 8 mo
- Umc Petroleum CorporationSep 1993 → Dec 1995 · 28 mo
- Stratco Operating Co., Inc.Jan 1996 → Aug 1996 · 8 mo
- Friemel, Paul D. & Assoc., Inc.Sep 1996 → Jun 2005 · 106 mo
- OK Arena Operating CompanyJul 2005 → Jul 2010 · 61 mo
- Sandridge Expl. and Prod., LLCAug 2010 → Oct 2018 · 99 mo
- Avalon TX Operating, LLCNov 2018 → Jul 2021 · 33 mo
- Montare Operating, Ltd.Aug 2021 → Jul 2026 · 60 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
17
wells completed on the lease
- Plugged
- 8
- Producing
- 4
- Shut In
- 4
- Not on Schedule
- 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-10-20638, documented in the API reference.