WELL · 42-507-32271 · DISTRICT 1
Glasscock Ranch A #12
Zavala County · Pearsall (Austin Chalk) field · Horizontal
Glasscock Ranch A #12 (API 42-507-32271) is a plugged horizontal well in Zavala County, plugged May 5, 2022, last operated by Trinity Operating (Usg) LLC.
The RRC has issued 2 drilling permits between 1989 and 1992, permitted to 7,000 ft.
It was permitted by Winn Exploration CO., Inc. and has since transferred to Trinity Operating (Usg) LLC on the wellbore schedule.
Completion filings report 5 formation tops, including Escondido, Olmos, San Miguel, Anacacho.
Its lease has reported 275K barrels of oil and 1.12M mcf of gas since January 1993, last reporting in May 2024. The lease carries 29 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Winn Exploration Co., Inc.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jan 28, 2026
- Permits on file
- 392
- Phone
- (713) 951-5309
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Trinity Operating (Usg) LLC |
| Production reports | Matador Production Companythrough Jul 2021 |
| Latest permit | Winn Exploration Co., Inc.Nov 20, 1992 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,000
- total depth, ft
- 2
- permits on file
- Nov 20, 1992
- last permit issued
- Dec 21, 1989
- completed
- 275K
- cumulative oil, bbl
- 1.12M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH May 2024
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Dec 21, 1989
- Shut in
- —
- Plugged
- May 5, 2022
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 29 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Glasscock Ranch A O-1-9813 | Pearsall (Austin Chalk) | Trinity Operating (Usg), LLC | 29 | 275K | 1.12M | Jan 1993 – May 2024 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Winn Exploration Co., Inc.Jan 1993 → Oct 1994
- 2McDay Energy Corp.Nov 1994 → Nov 2010
- 3Matador Production CompanyMar 2011 → Jul 2021
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 406406-99 | Other | Winn Exploration Co., Inc. | Nov 20, 1992 | Nov 20, 1992 | Nov 20, 1992 | 7,000 |
| 366871-99 | Drill | Winn Exploration Co., Inc. | Nov 22, 1989 | Nov 22, 1989 | Nov 28, 1989 | 7,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-9813 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 673 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Escondido | 3,360 | -2,687 |
| Olmos | 4,500 | -3,827 |
| San Miguel | 5,318 | -4,645 |
| Anacacho | 5,874 | -5,201 |
| Austin Chalk | 6,175 | -5,502 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,330 | 5,376 | Perforated |
| 6,175 | 6,362 | Perforated |
| 6,175 | 6,531 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 745 | 14.75 | 480 S |
| 7 | 5,922 | 9.875 | 450 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 | Jan 23, 2002 | Jul 20, 2000 | — |
| 00 | Sep 17, 1993 | Jun 28, 1993 | Yes |
| 00 | Jan 15, 1990 | Dec 29, 1989 | Yes |
| 00 | Jan 9, 1990 | — | — |
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 42-507-32271 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-507-32271 → 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/50732271, documented in the API reference.