WELL · 42-409-01720 · DISTRICT 4
Welder D #20
San Patricio County · Portilla (7100 Sand) field · Vertical
Welder D #20 (API 42-409-01720) is a plugged well in San Patricio County, plugged September 27, 1984, last operated by Sandalwood Oil & Gas Inc..
The RRC has issued one drilling permit, issued September 6, 1983, permitted to 7,161 ft.
It was permitted by Marathon Oil Company and has since transferred to Sandalwood Oil & Gas Inc. on the wellbore schedule.
Completion filings report 3 formation tops, including Miocene (undifferentiated), Anahuac, Frio.
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 CompanySep 6, 1983 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,161
- total depth, ft
- 1
- permits on file
- Sep 6, 1983
- last permit issued
- —
- completed
- —
- cumulative oil, bbl
- —
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- —
- Shut in
- —
- Plugged
- Sep 27, 1984
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.
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 209851-99 | Recompletion | Marathon Oil Company | Aug 26, 1983 | Sep 6, 1983 | — | 7,161 |
Formation tops
As filed on W-2/G-1. Subsea from 46 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Miocene (undifferentiated)MIOCENE AND YOUNGER | 4,450 | -4,404 |
| Anahuac | 5,150 | -5,104 |
| Frio | 7,161 | -7,115 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,378 | 4,383 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 1,113 | — | — |
| 10.75 | 1,128 | 15 | 550 S |
| 2 | 7,103 | — | — |
| 5.5 | 7,161 | 9.875 | 500 S |
| 5.5 | 7,172 | — | — |
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 16, 1984 | Feb 10, 1984 | — |
| 00 | Mar 28, 1984 | Feb 10, 1984 | — |
| 00 | Jan 12, 1984 | Feb 10, 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 42-409-01720 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-409-01720 → 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/40901720, documented in the API reference.