WELL · 42-409-31893 · DISTRICT 4
Welder M.S. #66H
San Patricio County · Portilla (8500 Sand) field · Horizontal
Welder M.S. #66H (API 42-409-31893) is a horizontal well in San Patricio County operated by Mobil Producing TX. & N.M. Inc., completed April 16, 1984.
The RRC has issued 7 drilling permits (amended once) between 1984 and 1997, permitted to 9,100 ft.
It was permitted by Abraxas Petroleum Corporation and has since transferred to Mobil Producing TX. & N.M. Inc. on the wellbore schedule.
Completion filings report 4 formation tops, including 8100 Sand, Portilla (8100 Sd.), 8500 Sand, Portilla (8500 Sd.).
Its 5 leases have reported 3.39M barrels of oil and 7.56M mcf of gas since January 1993, last reporting in July 2026. The leases carry 167 wells, so these are lease totals, not this well alone.
Operator of record
Mobil Producing TX. & N.M. Inc.
Permitted by Abraxas Petroleum Corporation; the EWA schedule now lists a different operator.
Spring, TX · P-5 Y, filed May 4, 2026 · 6,763 permits on file · (281) 773-7706
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Mobil Producing TX. & N.M. Inc. |
| Production reports | Allegiant Resources, LLCthrough Apr 2026 |
| Latest permit | Abraxas Petroleum CorporationApr 15, 1997 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,100
- total depth, ft
- 8
- permits on file
- Apr 15, 1997
- last permit issued
- Apr 16, 1984
- completed
- 3.39M
- cumulative oil, bbl
- 7.56M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Apr 16, 1984
- Shut in
- —
- Plugged
- —
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 5 leases this well is completed on; they carry 167 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Welder, Minnie S. O-4-12594 | Portilla (Frio) | Allegiant Resources, LLC | 110 | 2.66M | 5.72M | Sep 1996 – Jul 2026 |
| Welder, Minnie S. O-4-2178 | Portilla (7400 Sand) | Abraxas Petroleum Corporation | 43 | 686K | 1.65M | Jan 1993 – Nov 1996 |
| Welder, Minnie S. O-4-2180 | Portilla (8100 Sand) | Abraxas Petroleum Corporation | 13 | 47.7K | 180K | Jan 1993 – Nov 1996 |
| Welder, Minnie S. O-4-11944 | Portilla (7700-a Sand) | Abraxas Production Corporation | 1 | 283 | 2.59K | Jan 1993 – May 1993 |
| — O-4-11075 | — | — | 0 | 0 | 0 | — |
Oil, barrels lease total
Last 12 months 11,265 · prior 12 23,209(-51%)
Gas, mcf lease total
Last 12 months 44,651 · prior 12 31,729(+41%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Mobil Producing TX. & N.M. Inc.Jan 1993 → Mar 1993
- 2Abraxas Production CorporationApr 1993 → Jan 1996
- 3Abraxas Petroleum CorporationFeb 1996 → Aug 2016
- 4Frostwood Energy, LLCSep 2016 → Jan 2021
- 5Allegiant Resources, LLCFeb 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 461127-99 | Recompletion | Abraxas Petroleum Corporation | Apr 15, 1997 | Apr 15, 1997 | Apr 15, 1997 | 8,600 |
| 407080-99 | Recompletion | Mobil Producing TX. & N.M. Inc. | Dec 10, 1992 | Jan 5, 1993 | Mar 8, 1993 | 8,600 |
| 386229-98 | Recompletion | Mobil Producing TX. & N.M. Inc. | May 20, 1991 | Apr 2, 1991 | Apr 24, 1991 | 8,600 |
| 386229-99 | Recompletion | Mobil Producing TX. & N.M. Inc. | Mar 29, 1991 | Apr 2, 1991 | — | 8,600 |
| 373534-99 | Recompletion | Mobil Producing TX. & N.M. Inc. | May 18, 1990 | May 22, 1990 | — | 8,600 |
| 301557-99 | Recompletion | Mobil Producing TX. & N.M. Inc. | Apr 22, 1986 | Apr 28, 1986 | — | 8,600 |
| 237227-99 | Drill | Superior Oil Company, The | Apr 30, 1984 | Apr 30, 1984 | — | 9,100 |
| 229464-99 | Drill | Superior Oil Company, The | Feb 6, 1984 | Feb 6, 1984 | — | 9,100 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-4-2178 | — | — | — | — |
| — | — O-4-2180 | — | — | — | — |
| — | — O-4-11075 | — | — | — | — |
| — | — O-4-11944 | — | — | — | — |
| — | — O-4-12594 | — | — | — | — |
| — | — O-4-12594 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 17 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| 8100 Sand | 8,082 | -8,065 |
| Portilla (8100 Sd.) | 8,082 | -8,065 |
| 8500 Sand | 8,532 | -8,515 |
| Portilla (8500 Sd.) | 8,532 | -8,515 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,344 | 7,352 | Perforated |
| 7,348 | 7,356 | Perforated |
| 7,545 | 7,745 | Perforated |
| 7,698 | 7,703 | Perforated |
| 8,084 | 8,103 | Perforated |
| 8,092 | 8,103 | Perforated |
| 8,379 | 8,384 | Perforated |
| 8,389 | 8,393 | Perforated |
| 8,404 | 8,412 | Perforated |
| 8,424 | 8,431 | Perforated |
| 8,532 | 8,542 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 1,238 | 14.75 | 596 sx |
| 10.75 | 1,238 | — | — |
| 7.625 | 8,600 | 9.875 | 1,180 sx |
| 7.625 | 8,600 | — | — |
| 7 | 8,600 | — | — |
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 | Apr 27, 1998 | Jul 28, 1997 | Yes |
| 00 | Feb 23, 1998 | Jun 3, 1993 | — |
| 00 | Sep 5, 1996 | Jun 3, 1993 | — |
| 00 | Sep 28, 1993 | Jun 3, 1993 | — |
| 00 | Apr 28, 1993 | Mar 26, 1993 | Yes |
| 00 | Apr 1, 1993 | May 29, 1991 | Yes |
| 00 | Jul 18, 1991 | May 29, 1991 | Yes |
| 00 | Jun 18, 1991 | Jun 25, 1990 | Yes |
| 00 | Oct 1, 1990 | Jun 25, 1990 | Yes |
| 00 | Aug 24, 1990 | — | — |
| 00 | Feb 29, 1988 | Jan 12, 1988 | — |
| 00 | Feb 3, 1988 | May 7, 1984 | — |
| 00 | Aug 19, 1986 | Jul 29, 1986 | Yes |
| 00 | Aug 6, 1986 | — | — |
| 00 | Jun 5, 1984 | May 7, 1984 | — |
| 00 | Jun 4, 1984 | May 7, 1984 | — |
| 00 | May 25, 1984 | May 7, 1984 | — |
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 42-409-31893 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-409-31893 → 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.
Beyond the permit record
RRC UIC permits · H-10 reported volumes
Injection
- 0
- bbl, last 12 reported months
- 0
- bbl, all reported
- —
- reported through
| UIC | Kind | Status | Permitted bbl/d | Max psi | Zone ft |
|---|---|---|---|---|---|
| 000116144 | H-1 Injection | Not activated | 10,000 | 1,977 | 3,955–4,968 |
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/40931893, documented in the API reference.