WELL · 42-041-31475 · DISTRICT 3
Mary Walker Unit #1
Brazos County · Giddings (Austin Chalk-3) field · Horizontal · Sidetrack
Mary Walker Unit #1 (API 42-041-31475) is a plugged horizontal well in Brazos County, plugged March 1, 2019, last operated by Magnolia Oil & Gas Operating LLC.
The RRC has issued 2 drilling permits (amended 3 times) between 1990 and 1992, permitted to 14,700 ft.
It was permitted by Union Pacific Resources Company and has since transferred to Magnolia Oil & Gas Operating LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Midway, Navarro, Pecan Gap, Austin Chalk.
Its lease has reported 52.6K barrels of oil and 376K mcf of gas since January 1993, last reporting in January 2023.
Operator of record
Magnolia Oil & Gas Operating LLC
Permitted by Union Pacific Resources Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 6, 2026
- Permits on file
- 615
- Phone
- (713) 842-9050
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Magnolia Oil & Gas Operating LLC |
| Production reports | Enervest Operating, L.L.C.through Apr 2012 |
| Latest permit | Union Pacific Resources CompanyApr 29, 1992 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 14,700
- total depth, ft
- 5
- permits on file
- Apr 29, 1992
- last permit issued
- Jul 15, 1992
- completed
- 52.6K
- cumulative oil, bbl
- 376K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jan 2023
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jul 15, 1992
- Shut in
- —
- Plugged
- Mar 1, 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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mary Walker Unit O-3-21358 | Giddings (Austin Chalk-3) | Magnolia Oil & Gas Operating LLC | 1 | 52.6K | 376K | Jan 1993 – Jan 2023 |
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.
- 1Union Pacific Resources CompanyJan 1993 → Sep 1999
- 2Anadarko E&P Company LPJun 2006 → Jul 2007
- 3Enervest Operating, L.L.C.Aug 2007 → Oct 2010
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 398731-99 | Recompletion · sidetrack | Union Pacific Resources Company | Apr 24, 1992 | Apr 29, 1992 | Jun 25, 1992 | 14,700 |
| 382624-96 | Drill | Union Pacific Resources Company | Mar 13, 1992 | Dec 21, 1990 | — | 14,700 |
| 382624-97 | Drill | Union Pacific Resources Company | Jan 17, 1992 | Dec 21, 1990 | Nov 6, 1991 | 14,700 |
| 382624-98 | Drill | Union Pacific Resources Company | Aug 6, 1991 | Dec 21, 1990 | — | 14,300 |
| 382624-99 | Drill | Union Pacific Resources Company | Dec 20, 1990 | Dec 21, 1990 | — | 14,700 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-3-21358 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 273 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Midway | 5,904 | -5,631 |
| Navarro | 7,474 | -7,201 |
| Pecan Gap | 8,473 | -8,200 |
| Austin Chalk | 9,678 | -9,405 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,744 | 13,332 | Perforated |
| 9,754 | 13,804 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 2,335 | 14.75 | 1,300 S |
| 7.625 | 9,744 | 9.875 | 575 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 | Feb 17, 1993 | Jan 26, 1993 | — |
| 00 | Feb 28, 1992 | Jan 31, 1992 | Yes |
| 00 | Feb 20, 1992 | — | — |
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 42-041-31475 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-041-31475 → 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/04131475, documented in the API reference.