WELL · 42-427-34526 · DISTRICT 4
Margo #12
Starr County · Arroyo Grande (Queen City) field · Producing · Vertical
Margo #12 (API 42-427-34526) is a well in Starr County operated by Starr Operating LLC, completed February 9, 2011 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 30, 2010, permitted to 5,000 ft.
It was permitted by Newgulf Petroleum, LLC and has since transferred to Starr Operating LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Crockett, Cook Mountain, Queen City.
Its lease has reported 349K barrels of oil and 699K mcf of gas since August 2002, last reporting in July 2026. The lease carries 7 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Newgulf Petroleum, LLC; the EWA schedule now lists a different operator.
San Antonio, TX · P-5 Y, filed Jun 4, 2026 · 1 permits on file · (956) 330-1922
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Starr Operating LLC |
| Production reports | Starr Operating, LLCthrough Apr 2026 |
| Latest permit | Newgulf Petroleum, LLCAug 30, 2010 |
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
- 1
- permits on file
- Aug 30, 2010
- last permit issued
- Feb 9, 2011
- completed
- 349K
- cumulative oil, bbl
- 699K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2002 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Feb 9, 2011
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
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; they carry 7 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Margo O-4-13094 | Arroyo Grande (Queen City) | Starr Operating, LLC | 7 | 349K | 699K | Aug 2002 – Jul 2026 |
Oil, barrels lease total
Last 12 months 19,105 · prior 12 22,399(-15%)
Gas, mcf lease total
Last 12 months 45,193 · prior 12 52,358(-14%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Newgulf Petroleum, LLCAug 2002 → Sep 2017
- 2Starr Operating, LLCOct 2017 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 701318-99 | Drill | Newgulf Petroleum, LLC | Aug 26, 2010 | Aug 30, 2010 | Sep 14, 2010 | 5,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-4-13094 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 382 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Crockett | 2,084 | -1,702 |
| Cook Mountain | 2,815 | -2,433 |
| Queen City | 3,799 | -3,417 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,097 | 4,117 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,027 | 12.25 | 487 S |
| 5.5 | 4,263 | 7.875 | 610 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 | Nov 7, 2011 | Feb 16, 2011 | Yes |
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 42-427-34526 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-427-34526 → 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/42734526, documented in the API reference.