WELL · 42-311-31454 · DISTRICT 1
South Texas Syndicate -A- #12
McMullen County · Green Branch (4600) field · Vertical
South Texas Syndicate -A- #12 (API 42-311-31454) is a well in Mcmullen County operated by Caribbean Energy LLC II, completed July 29, 1980.
The RRC has issued 2 drilling permits between 1980 and 2005, permitted to 6,200 ft.
It was permitted by Whiting Oil And Gas Corporation and has since transferred to Caribbean Energy LLC II on the wellbore schedule.
Its 2 leases have reported 640K barrels of oil and 825 mcf of gas since January 1993, last reporting in July 2026. The leases carry 7 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Whiting Oil and Gas Corporation; the EWA schedule now lists a different operator.
Cotulla, TX · P-5 Y, filed Jul 4, 2026 · 1 permits on file · (830) 202-7200
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Caribbean Energy LLC II |
| Production reports | Caribbean Energy LLC IIthrough Apr 2026 |
| Latest permit | Whiting Oil and Gas CorporationJun 27, 2005 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 6,200
- total depth, ft
- 2
- permits on file
- Jun 27, 2005
- last permit issued
- Jul 29, 1980
- completed
- 640K
- cumulative oil, bbl
- 825
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jul 29, 1980
- 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 7 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| South Texas Syndicate -A- O-1-6008 | Green Branch (4600) | Caribbean Energy LLC II | 5 | 417K | 825 | Jan 1993 – Jul 2026 |
| South Texas Syndicate -A- O-1-14547 | Green Branch | Caribbean Energy LLC II | 2 | 223K | 0 | Oct 2004 – Jul 2026 |
Oil, barrels lease total
Last 12 months 8,448 · prior 12 8,768(-4%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1American Cometra, Inc.Jan 1993 → Mar 1993
- 2Swift Energy CompanyApr 1993 → Jun 2002
- 3Whiting Petroleum CorporationJul 2002 → Nov 2003
- 4Whiting Oil and Gas CorporationDec 2003 → Dec 2015
- 5Foundation Energy Management LLCJan 2016 → Jul 2018
- 6Terrafina Energy, LLCAug 2018 → Feb 2023
- 7Vermillion Production, Inc.Mar 2023 → Feb 2026
- 8Caribbean Energy LLC IIMar 2026 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 600502-99 | Recompletion | Whiting Oil and Gas Corporation | May 10, 2005 | Jun 27, 2005 | Jul 12, 2005 | 4,785 |
| 79303-99 | Drill | Skinner Corp-Newman Bros.drlg.co | Apr 25, 1980 | Apr 25, 1980 | — | 6,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-6008 | — | — | — | — |
| — | — O-1-14547 | — | — | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 3,924 | 3,932 | Perforated |
| 4,701 | 4,703 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 327 | 12.25 | 210 S |
| 4.5 | 4,765 | 7.875 | 1,030 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 | Oct 18, 2005 | Jul 26, 2005 | Yes |
| 00 | Aug 10, 2005 | — | — |
| 00 | Jan 12, 1984 | Aug 7, 1980 | — |
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 42-311-31454 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-311-31454 → 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/31131454, documented in the API reference.