WELL · 42-133-33831 · DISTRICT 7
Ziehr Fred #1
Eastland County · Mangum South (U.marble Falls) field · Vertical
Ziehr Fred #1 (API 42-133-33831) is a plugged well in Eastland County, plugged February 2, 2026, last operated by Penn-Tex Engineering.
The RRC has issued 2 drilling permits (amended once) between 1982 and 1994, permitted to 3,650 ft.
It was permitted by Whittington, James C., Inc. and has since transferred to Penn-Tex Engineering on the wellbore schedule.
Completion filings report 4 formation tops, including Strawn, Caddo, Marble Falls, Duffer.
Operator of record
Permitted by Whittington, James C., Inc.; the EWA schedule now lists a different operator.
Dallas, TX · P-5 Y, filed Jun 3, 2016 · 10 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Penn-Tex Engineering |
| Production reports | Rhyne, J.V.through Mar 2002 |
| Latest permit | Whittington, James C., Inc.May 12, 1994 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 3,650
- total depth, ft
- 3
- permits on file
- May 12, 1994
- last permit issued
- Oct 21, 1982
- completed
- 0
- cumulative oil, bbl
- 35.1K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Feb 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Oct 21, 1982
- Shut in
- —
- Plugged
- Feb 2, 2026
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 |
|---|---|---|---|---|---|---|
| Weiser G-8-151112 | Eastland County Regular (Gas) | Denteco Oil Company LLC | 1 | 0 | 35.1K | Aug 1994 – Feb 2026 |
| Zierhr, Fred G-8-111435 | Mangum, South (U.marble Falls) | Penn-Tex Engineering | 1 | 0 | 0 | Jan 1993 – Aug 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.
- 1Whittington, James C., Inc.Sep 1994 → Sep 1994
- 2Dene's Water Hauling, Inc.Oct 1994 → Dec 1994
- 3Rhyne, J.V.Feb 1995 → Mar 2002
- 4SO Operating CompanyAug 1996 → Jan 1998
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 423610-98 | Recompletion | Whittington, James C., Inc. | Sep 6, 1994 | May 12, 1994 | Jun 1, 1994 | 2,000 |
| 423610-99 | Recompletion | Whittington, James C., Inc. | May 5, 1994 | May 12, 1994 | — | 2,000 |
| 157593-99 | Drill | Penn-Tex Engineering | Apr 21, 1982 | Apr 21, 1982 | — | 3,650 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-8-111435 | — | — | — | — |
| — | — G-8-151112 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 1,546 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Strawn | 1,515 | 31 |
| StrawnMIDDLE STRAWN | 1,710 | -164 |
| Caddo | 2,892 | -1,346 |
| Marble Falls | 3,128 | -1,582 |
| Duffer | 3,553 | -2,007 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 1,711 | 1,716 | Perforated |
| 3,128 | 3,136 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 321 | 11 | 175 sx |
| 4.5 | 1,812 | 7.875 | 105 S |
| 2.375 | 3,155 | — | — |
| 4.5 | 3,233 | 7.875 | 110 sx |
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 | Oct 18, 1994 | Sep 13, 1994 | Yes |
| 00 | Oct 4, 1994 | — | — |
| 00 | Jul 20, 1984 | Jun 15, 1984 | — |
| 00 | Jan 12, 1984 | Nov 12, 1982 | — |
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 42-133-33831 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-133-33831 → 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/13333831, documented in the API reference.