WELL · 42-311-35428 · DISTRICT 1
Y Bar MCM #B 1H
McMullen County · Eagleville (Eagle Ford-1) field · Shut IN · Horizontal
Y Bar Mcm #B 1H (API 42-311-35428) is a horizontal well in Mcmullen County operated by Castlerock EF Operating LLC, completed October 2, 2013 and listed as shut in on the RRC schedule.
The RRC has issued one drilling permit, issued May 9, 2013, permitted to 12,000 ft.
It was permitted by Chesapeake Operating, Inc. and has since transferred to Castlerock EF Operating LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its lease has reported 277K barrels of oil and 180K mcf of gas since May 2013, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Chesapeake Operating, Inc.; the EWA schedule now lists a different operator.
San Antonio, TX · P-5 Y, filed Nov 4, 2025 · 34 permits on file · (210) 688-4585
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Castlerock EF Operating LLC |
| Production reports | Castlerock EF Operating LLCthrough Feb 2025 |
| Latest permit | Chesapeake Operating, Inc.May 9, 2013 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 1
- permits on file
- May 9, 2013
- last permit issued
- Oct 2, 2013
- completed
- 277K
- cumulative oil, bbl
- 180K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2013 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Oct 2, 2013
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the lease this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Y Bar MCM O-1-16919 | Eagleville (Eagle Ford-1) | Castlerock EF Operating LLC | 2 | 277K | 180K | May 2013 – Jul 2026 |
Oil, barrels lease total
Last 12 months 0 · prior 12 1,189(-100%)
Gas, mcf lease total
Last 12 months 0 · prior 12 1,739(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Chesapeake Operating, Inc.Aug 2013 → Oct 2014
- 2Chesapeake Operating, L.L.C.Nov 2014 → May 2017
- 3Murphy Expl. & Prod. Co. - USAJun 2017 → Dec 2021
- 4Castlerock EF Operating LLCJan 2022 → Feb 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 762202-99 | Drill | Chesapeake Operating, Inc. | May 7, 2013 | May 9, 2013 | Jul 26, 2013 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-16919 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 346 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 8,993 | -8,647 |
| Austin Chalk | 9,332 | -8,986 |
| Eagle FordEAGLEFORD | 9,521 | -9,175 |
| Eagle FordEAGLEFORD | 9,573 | -9,227 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,812 | 14,651 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 4,145 | 12.25 | 850 S |
| 5.5 | 14,826 | 7.875 | 1,305 S |
Completion filings
W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Jul 24, 2026 | Jul 10, 2026 | — |
| 00 | Feb 21, 2014 | Jan 13, 2014 | — |
The source documents
Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.
- Wellbore filings for 42-311-35428 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-311-35428 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.
About this data
Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.
New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease
Developers: this page as JSON is GET /v1/data/wells/31135428, documented in the API reference.