LEASES · O-1-15530 · OIL · DISTRICT 01
Y-Bar
ReportingCastlerock EF Operating LLC · LA Salle County and McMullen · Eagleville (Eagle Ford-1) field
Y-Bar is an RRC oil lease (O-1-15530) in La Salle County operated by Castlerock EF Operating LLC, with 32 wells completed on it.
It has reported 3.77M barrels of oil and 5.35M mcf of gas since July 2011, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 119K barrels of oil, down 38% on the year before; the lease peaked at 107K barrels in December 2013.
2 operators have filed production on it, most recently Castlerock EF Operating LLC since August 2022.
- 3.77M
- bbl oil, all reported
- 5.35M
- mcf gas incl. casinghead
- 119K
- bbl oil, last 12 reported
- -38%
- vs the 12 before
- 32
- wells completed on it
- 107K
- peak month, bbl (Dec 2013)
PDQ LEASE REPORTS · FIRST JUL 2011 · 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 118,791 · prior 12 192,852(-38%)
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 183,809 · prior 12 159,315(+15%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 19 reporting months of oil since the peak in Oct 2024. 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.
- 71%
- first-year decline from the peak (nominal Di 550%)
- 2.0
- b factor (hyperbolic)
- 0.94
- fit R²
- 1.46M
- 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 118,791
Fitted hyperbolic curve from the Oct 2024 peak, dashed 24 months past the last report
| Projected month | Oct 2026 | Apr 2027 | Oct 2027 | Apr 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 7,098 | 6,376 | 5,838 | 5,416 |
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.
- Murphy Expl. & Prod. Co. - USAJul 2011 → Jul 2022 · 133 mo
- Castlerock EF Operating LLCAug 2022 → Jul 2026 · 48 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
32
wells completed on the lease
- Shut IN
- 21
- Producing
- 11
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-1-15530, documented in the API reference.