WELL · 42-427-33152 · DISTRICT 4
Marrs McLean #29
Starr County · Lockhart (Cockfield 4) field · Vertical
Marrs Mclean #29 (API 42-427-33152) is a well in Starr County operated by Opex Energy LLC, completed April 29, 1999.
The RRC has issued 2 drilling permits between 1999 and 2005, permitted to 5,000 ft.
Completion filings report 5 formation tops, including Pettus, Cockfield1, Cockfield2, Cockfield4.
No lease production has been reported under this well’s leases.
Operator of record
Houston, TX · P-5 Y, filed Feb 8, 2008 · 19 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Opex Energy LLC |
| Production reports | White Stride LLCthrough Mar 2026 |
| Latest permit | Opex Energy, LLCMay 6, 2005 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,000
- total depth, ft
- 2
- permits on file
- May 6, 2005
- last permit issued
- Apr 29, 1999
- completed
- 0
- cumulative oil, bbl
- 889K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 1999 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Apr 29, 1999
- 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 |
|---|---|---|---|---|---|---|
| McLean, Marrs G-4-209967 | Lockhart (P-1, South) | White Stride LLC | 1 | 0 | 516K | Apr 2005 – Jul 2026 |
| Marrs McLean G-4-172985 | Lockhart (Cockfield 4) | Opex Energy, LLC | 1 | 0 | 373K | Apr 1999 – Apr 2005 |
Gas, mcf lease total
Last 12 months 8,225 · prior 12 9,948(-17%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Ceniza Petroleum, Inc.May 1999 → Feb 2003
- 2White Oak Operating Company LLCMar 2003 → Dec 2003
- 3Opex Energy, LLCMay 2005 → Mar 2007
- 4Exploration Company, TheApr 2007 → Jun 2007
- 5Txco Resources Inc.Jul 2007 → Jul 2008
- 6Continental Operating Co.Aug 2008 → Nov 2019
- 7Maverick Brothers Operating,inc.Dec 2019 → Jun 2025
- 8White Stride LLCJul 2025 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 600285-99 | Recompletion | Opex Energy, LLC | May 5, 2005 | May 6, 2005 | Apr 27, 2005 | 4,510 |
| 482436-99 | Drill | Ceniza Petroleum, Inc. | Feb 3, 1999 | Feb 3, 1999 | Feb 6, 1999 | 5,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-4-172985 | — | — | — | — |
| — | — G-4-209967 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 340 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Pettus | 3,500 | -3,160 |
| COCKFIELD1 | 3,555 | -3,215 |
| COCKFIELD2 | 3,678 | -3,338 |
| COCKFIELD4 | 3,870 | -3,530 |
| Yeguaf | 4,375 | -4,035 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 3,504 | 3,520 | Perforated |
| 3,871 | 3,873 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 312 | 12.25 | 220 S |
| 40.5 | 4,450 | 7.875 | 410 S |
| 4.5 | 4,450 | 7.875 | 410 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 17, 2005 | May 19, 2005 | Yes |
| 00 | Aug 10, 2005 | — | — |
| 00 | Jun 18, 1999 | May 21, 1999 | Yes |
| 00 | Jun 9, 1999 | — | — |
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 42-427-33152 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-427-33152 → 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/42733152, documented in the API reference.