WELL · 42-505-31578 · DISTRICT 4
Trevino #4
Zapata County · Francisco (Lobo 9500) field · Vertical
Trevino #4 (API 42-505-31578) is a well in Zapata County operated by Transamerican Natural Gas Corp., completed January 7, 1983.
The RRC has issued 2 drilling permits between 1982 and 1998, permitted to 10,500 ft.
It was permitted by Conoco Inc. and has since transferred to Transamerican Natural Gas Corp. on the wellbore schedule.
Completion filings report 5 formation tops, including Sparta, Queen City, Wilcox, Wills Point.
No lease production has been reported under this well’s leases.
Operator of record
Transamerican Natural Gas Corp.
Permitted by Conoco Inc.; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Aug 4, 2025 · 772 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Transamerican Natural Gas Corp. |
| Production reports | Hilcorp Energy Companythrough Dec 2014 |
| Latest permit | Conoco Inc.Feb 11, 1998 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,500
- total depth, ft
- 2
- permits on file
- Feb 11, 1998
- last permit issued
- Jan 7, 1983
- completed
- 0
- cumulative oil, bbl
- 724K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jan 7, 1983
- 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 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Trevino G-4-112532 | Francisco (Lobo 8200) | Hilcorp Energy Company | 1 | 0 | 674K | Jan 1993 – Jul 2026 |
| Trevino G-4-170895 | Las Lomas (Wilcox 7800) | Hilcorp Energy Company | 1 | 0 | 50.7K | Jun 1998 – Jul 2026 |
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 → Jul 1993
- 2Transtexas Gas CorporationAug 1993 → May 1997
- 3Conoco Inc.Jun 1997 → Dec 2001
- 4Houston Exploration Company, TheFeb 2002 → Jun 2007
- 5Forest Oil CorporationJul 2007 → Dec 2012
- 6Hilcorp Energy CompanyJan 2013 → Dec 2014
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 473251-99 | Recompletion | Conoco Inc. | Feb 11, 1998 | Feb 11, 1998 | May 19, 1998 | 10,000 |
| 174168-99 | Drill | TDC Engineering, Inc. | Aug 24, 1984 | Oct 13, 1982 | Oct 25, 1982 | 10,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-4-112532 | — | — | — | — |
| — | — G-4-170895 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 435 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Sparta | 918 | -483 |
| Queen City | 1,200 | -765 |
| WilcoxWILCOX CARRIZO | 3,740 | -3,305 |
| WilcoxLOWER WILCOX | 6,100 | -5,665 |
| WilcoxBASE OF LOWER WILCOX | 6,700 | -6,265 |
| WilcoxLOWER WILCOX | 6,700 | -6,265 |
| WilcoxBASE OF LOWER WILCOX | 7,700 | -7,265 |
| Wills Point | 9,500 | -9,065 |
| Will Point | 9,550 | -9,115 |
| Wills Point | 9,550 | -9,115 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,028 | 7,048 | Perforated |
| 7,978 | 8,272 | Perforated |
| 9,243 | 9,440 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 743 | 17.5 | 660 S |
| 7.625 | 6,605 | 12.25 | 925 S |
| 2.375 | 9,046 | — | — |
| 4.5 | 9,650 | 6.125 | 566 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 | Jul 24, 2000 | Jun 15, 2000 | — |
| 00 | May 15, 2000 | Apr 10, 2000 | — |
| 00 | May 12, 2000 | Apr 10, 2000 | — |
| 00 | Feb 18, 1999 | Nov 4, 1998 | — |
| 00 | Dec 3, 1998 | — | — |
| 00 | Mar 25, 1987 | Mar 12, 1987 | — |
| 00 | Oct 17, 1984 | Aug 24, 1984 | — |
| 00 | Oct 2, 1984 | Jul 22, 1984 | — |
| 00 | Jan 12, 1984 | May 9, 1983 | — |
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 42-505-31578 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-31578 → 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/50531578, documented in the API reference.