WELL · 42-461-31531 · DISTRICT 7
Wahlenmaier 42 #1
Upton County · Spraberry (Trend Area CL. Fk.) field · Vertical
Wahlenmaier 42 #1 (API 42-461-31531) is a plugged well in Upton County, plugged April 18, 2019, last operated by Atlas Operating LLC.
The RRC has issued 2 drilling permits between 1979 and 1984, permitted to 9,000 ft.
It was permitted by Ensource Inc. and has since transferred to Atlas Operating LLC on the wellbore schedule.
Completion filings report 6 formation tops, including Clear Fork, Spraberry, Jo Mill, Jomill.
Its lease has reported 44.4K barrels of oil and 121K mcf of gas since January 1993, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Ensource Inc.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Hearing (H)
- P-5 last filed
- Mar 9, 2026
- Permits on file
- 78
- Phone
- (281) 893-9400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Atlas Operating LLC |
| Production reports | Atlas Operating LLCthrough Apr 2021 |
| Latest permit | Ensource Inc.Dec 3, 1984 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,000
- total depth, ft
- 2
- permits on file
- Dec 3, 1984
- last permit issued
- Dec 19, 1984
- completed
- 44.4K
- cumulative oil, bbl
- 121K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Dec 19, 1984
- Shut in
- —
- Plugged
- Apr 18, 2019
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 |
|---|---|---|---|---|---|---|
| Wahlenmaier "42" O-9-11096 | Spraberry (Trend Area CL. Fk.) | Atlas Operating LLC | 2 | 44.4K | 121K | 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.
- 1Umc Petroleum CorporationJan 1993 → Mar 1997
- 2Pioneer Exploration CompanyApr 1997 → Jun 2001
- 3Pioneer Exploration, Ltd.Jul 2001 → Dec 2007
- 4Pioneer Exploration, LLCFeb 2008 → Mar 2010
- 5Atlas Operating LLCApr 2010 → Apr 2021
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 259546-99 | Recompletion | Ensource Inc. | Nov 19, 1984 | Dec 3, 1984 | — | 7,250 |
| 67935-99 | Drill | Palo-Placer | Dec 31, 1979 | Dec 31, 1979 | — | 9,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-11096 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,757 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Clear ForkCLEARFORK | 6,490 | -3,733 |
| Spraberry | 7,774 | -5,017 |
| Jo Mill | 8,175 | -5,418 |
| Jomill | 8,175 | -5,418 |
| Dean | 8,620 | -5,863 |
| Wolfcamp | 8,789 | -6,032 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,530 | 7,043 | Perforated |
| 7,737 | 8,785 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 763 | 11 | 325 S |
| 2.375 | 8,593 | — | — |
| 4.5 | 8,950 | 7.875 | 800 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 6, 1986 | Dec 18, 1985 | — |
| 00 | Jan 28, 1985 | Dec 27, 1984 | — |
| 00 | Jan 8, 1985 | — | — |
| 00 | Jan 12, 1984 | Oct 10, 1980 | — |
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 42-461-31531 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-31531 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. 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/46131531, documented in the API reference.