WELL · 42-409-01721 · DISTRICT 4
Welder D #21
San Patricio County · Portilla (7100 Sand) field · Vertical
Welder D #21 (API 42-409-01721) is a plugged well in San Patricio County, plugged November 30, 1995, last operated by Sandalwood Oil & Gas Inc..
The RRC has issued 2 drilling permits between 1977 and 1985, permitted to 7,145 ft.
It was permitted by Marathon Oil Company and has since transferred to Sandalwood Oil & Gas Inc. on the wellbore schedule.
Operator of record
Permitted by Marathon Oil Company; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Nov 4, 2025 · 92 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Sandalwood Oil & Gas Inc. |
| Production reports | none |
| Latest permit | Marathon Oil CompanyMay 14, 1985 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,145
- total depth, ft
- 2
- permits on file
- May 14, 1985
- last permit issued
- Jun 25, 1985
- completed
- 0
- cumulative oil, bbl
- 0
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Sep 1996
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 25, 1985
- Shut in
- —
- Plugged
- Nov 30, 1995
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 8 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Welder "D" O-4-2173 | Portilla (7100 Sand) | Sandalwood Oil & Gas, Inc. | 8 | 0 | 0 | Jan 1993 – Sep 1996 |
No volumes reported on these leases in the last three years.
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 275007-99 | Recompletion | Marathon Oil Company | May 13, 1985 | May 14, 1985 | — | 7,142 |
| 8946-99 | Recompletion | Marathon Oil Company | Oct 3, 1977 | Oct 3, 1977 | — | 7,145 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-4-2173 | — | — | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,378 | 4,386 | Perforated |
| 7,017 | 7,132 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 445 | — | 550 S |
| 10.75 | 1,134 | 13.75 | 550 S |
| 9.625 | 1,134 | — | 500 S |
| 2.375 | 6,967 | — | — |
| 5.5 | 7,145 | 8.75 | 500 S |
| 5.5 | 7,145 | — | — |
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 8, 1985 | Jul 25, 1985 | — |
| 00 | Jan 12, 1984 | Jan 29, 1979 | — |
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 42-409-01721 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-409-01721 → 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/40901721, documented in the API reference.