WELL · 42-505-32505 · DISTRICT 4
DE Los Santos Gas Unit 1 #4
Zapata County · Haynes (Middle Wilcox Cons.) field · Vertical
De Los Santos Gas Unit 1 #4 (API 42-505-32505) is a plugged well in Zapata County, plugged May 31, 2018, last operated by Marwell Petroleum Ltd Partnrship.
The RRC has issued one drilling permit, issued December 2, 1988, permitted to 12,000 ft.
It was permitted by Transamerican Natural Gas Corp. and has since transferred to Marwell Petroleum Ltd Partnrship on the wellbore schedule.
Completion filings report one formation top, including Wilcox.
Operator of record
Marwell Petroleum Ltd Partnrship
Permitted by Transamerican Natural Gas Corp.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jan 22, 2026
- Permits on file
- 2
- Phone
- (713) 781-1105
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Marwell Petroleum Ltd Partnrship |
| Production reports | Marwell Petroleum, Inc.through Sep 2004 |
| Latest permit | Transamerican Natural Gas Corp.Dec 2, 1988 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 1
- permits on file
- Dec 2, 1988
- last permit issued
- Feb 27, 1989
- completed
- 0
- cumulative oil, bbl
- 52.4K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH May 2018
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 27, 1989
- Shut in
- —
- Plugged
- May 31, 2018
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 |
|---|---|---|---|---|---|---|
| DE Los Santos Gas Unit 1 G-4-130143 | Haynes (Middle Wilcox Cons.) | Marwell Petroleum Ltd Partnrship | 1 | 0 | 52.4K | Jan 1993 – May 2018 |
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.
- 1Transamerican Natural Gas Corp.Jan 1993 → May 1997
- 2Transtexas Gas CorporationJun 1997 → Feb 1998
- 3Marwell Petroleum, Inc.Mar 1998 → Sep 2004
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 353816-99 | Drill | Transamerican Natural Gas Corp. | Dec 1, 1988 | Dec 2, 1988 | — | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-4-130143 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 457 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,410 | 11,563 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 750 | 14.75 | 530 S |
| 7.625 | 9,200 | 9.875 | 365 S |
| 2.875 | 11,975 | 6.75 | 626 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 | Apr 18, 1989 | Mar 10, 1989 | Yes |
| 00 | Apr 4, 1989 | — | — |
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 42-505-32505 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-32505 → 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/50532505, documented in the API reference.