WELL · 42-507-30436 · DISTRICT 1
Blalack Alvin W. Jr. B #3701H
Zavala County · Pearsall (Austin Chalk) field · Horizontal · Sidetrack
Blalack Alvin W. JR. B #3701H (API 42-507-30436) is a plugged horizontal well in Zavala County, plugged December 15, 2016, last operated by Bobcat Operating.
The RRC has issued 2 drilling permits (amended twice) between 1990 and 1991, permitted to 7,887 ft.
It was permitted by Citation Oil & Gas Corp. and has since transferred to Bobcat Operating on the wellbore schedule.
Completion filings report one formation top, including Austin Chalk.
Its 2 leases have reported 5 barrels of oil and 4 mcf of gas since January 1993, last reporting in July 2026. The leases carry 5 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Citation Oil & Gas Corp.; the EWA schedule now lists a different operator.
Stephenville, TX · P-5 Y, filed Feb 4, 2026
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Bobcat Operating |
| Production reports | Citation Oil & Gas Corp.through May 1994 |
| Latest permit | Citation Oil & Gas Corp.May 7, 1991 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,887
- total depth, ft
- 4
- permits on file
- May 7, 1991
- last permit issued
- May 27, 1991
- completed
- 5
- cumulative oil, bbl
- 4
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- May 27, 1991
- Shut in
- —
- Plugged
- Dec 15, 2016
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 2 leases this well is completed on; they carry 5 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Blalack, Alvan W. Jr. "A" O-1-5199 | Pearsall (Austin Chalk) | Bobcat Operating | 3 | 0 | 0 | Jan 1993 – Jul 2026 |
| Blalack, Alvin W. Jr. "B" O-1-12845 | Pearsall (Austin Chalk) | Bobcat Operating | 2 | 5 | 4 | Jan 1993 – Jul 2026 |
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.
- 1Citation Oil & Gas Corp.Jan 1993 → May 1994
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 387620-99 | Recompletion · sidetrack | Citation Oil & Gas Corp. | May 7, 1991 | May 7, 1991 | May 11, 1991 | 7,887 |
| 379250-97 | Recompletion · sidetrack | Citation Oil & Gas Corp. | Jan 28, 1991 | Oct 17, 1990 | — | 6,200 |
| 379250-98 | Recompletion · sidetrack | Citation Oil & Gas Corp. | Oct 18, 1990 | Oct 17, 1990 | Oct 12, 1990 | 6,200 |
| 379250-99 | Recompletion · sidetrack | Citation Oil & Gas Corp. | Oct 11, 1990 | Oct 17, 1990 | — | 6,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-5199 | — | — | — | — |
| — | — O-1-5199 | — | — | — | — |
| — | — O-1-12845 | — | — | — | — |
| — | — O-1-12845 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 636 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Austin Chalk | 6,070 | -5,434 |
| Austin Chalk | 6,073 | -5,437 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,070 | 6,240 | Perforated |
| 6,074 | 6,817 | Perforated |
| 6,233 | 7,887 | Perforated |
| 7,675 | — | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 250 | 12.25 | 175 S |
| — | 2,779 | — | 50 S |
| 5.5 | 7,049 | 7.875 | 490 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 | Aug 2, 1991 | Jun 5, 1991 | Yes |
| 00 | Mar 25, 1991 | Dec 20, 1990 | Yes |
| 00 | Mar 19, 1991 | — | — |
| 00 | Jan 15, 1991 | — | — |
| 00 | Jan 12, 1984 | Feb 28, 1977 | — |
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 42-507-30436 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-507-30436 → 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/50730436, documented in the API reference.