WELL · 42-041-31421 · DISTRICT 3
Zemanek-Wolf Unit #1H
Brazos County · Giddings (Austin Chalk-3) field · Horizontal · Sidetrack
Zemanek-Wolf Unit #1H (API 42-041-31421) is a plugged horizontal well in Brazos County, plugged April 30, 2009, last operated by Apache Corporation.
The RRC has issued 2 drilling permits between 1987 and 1992, permitted to 8,500 ft.
It was permitted by Dynamic Production, Inc. and has since transferred to Apache Corporation on the wellbore schedule.
Completion filings report 3 formation tops, including Austin Chalk, Buda, Georgetown.
Its 2 leases have reported 37.5K barrels of oil and 127K mcf of gas since January 1993, last reporting in July 2009. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Dynamic Production, Inc.; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Oct 4, 2025 · 9,754 permits on file · (713) 296-6400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Apache Corporation |
| Production reports | Apache Corporationthrough Dec 2007 |
| Latest permit | Dynamic Production, Inc.May 19, 1992 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,500
- total depth, ft
- 2
- permits on file
- May 19, 1992
- last permit issued
- Jun 28, 1992
- completed
- 37.5K
- cumulative oil, bbl
- 127K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2009
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 28, 1992
- Shut in
- —
- Plugged
- Apr 30, 2009
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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Zemanek-Wolf Unit O-3-21635 | Giddings (Austin Chalk-3) | Apache Corporation | 1 | 37.5K | 127K | Jan 1993 – Jul 2009 |
| Zemanek O-3-20041 | Caldwell, NE (Georgetown) | Dynamic Production, Inc. | 1 | 0 | 0 | Jan 1993 – Apr 1994 |
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.
- 1Dynamic Production, Inc.Jan 1993 → Mar 1997
- 2Apache CorporationApr 1997 → Dec 2007
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 399419-99 | Recompletion · sidetrack | Dynamic Production, Inc. | May 19, 1992 | May 19, 1992 | May 26, 1992 | 7,600 |
| 340057-99 | Drill | T. M. Energy, Inc. | Dec 11, 1987 | Dec 15, 1987 | — | 8,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-3-20041 | — | — | — | — |
| — | — O-3-21635 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 311 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Austin Chalk | 7,332 | -7,021 |
| Austin ChalkAUSTIN CHALK (TVD) | 7,338 | -7,027 |
| Austin ChalkAUSTIN CHALK (MD) | 7,343 | -7,032 |
| Buda | 8,032 | -7,721 |
| Georgetown | 8,120 | -7,809 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,343 | 10,131 | Perforated |
| 7,388 | 7,599 | Perforated |
| 8,034 | 8,088 | Perforated |
| 8,121 | 8,206 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 823 | 12.25 | 270 S |
| 5.5 | 8,232 | 7.875 | 405 S |
| 5.5 | — | 7.875 | 405 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 | Sep 17, 1992 | Jul 20, 1992 | Yes |
| 00 | Sep 8, 1992 | Apr 4, 1988 | Yes |
| 00 | Apr 28, 1988 | Apr 4, 1988 | Yes |
| 00 | Apr 16, 1988 | — | — |
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 42-041-31421 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-041-31421 → 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/04131421, documented in the API reference.