WELL · 42-255-31857 · DISTRICT 2
Turnbull Unit A #6H
Karnes County · Eagleville (Eagle Ford-2) field · Horizontal
Turnbull Unit A #6H (API 42-255-31857) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed July 17, 2011.
The RRC has issued one drilling permit, issued February 1, 2011, permitted to 13,500 ft.
It was permitted by Hilcorp Energy Company and has since transferred to Marathon Oil EF LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its 2 leases have reported 938K barrels of oil and 2.44M mcf of gas since December 2010, last reporting in July 2026. The leases carry 15 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Hilcorp Energy Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Sep 26, 2025
- Permits on file
- 3,191
- Phone
- (832) 486-2737
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Marathon Oil EF LLC |
| Production reports | Marathon Oil EF LLCthrough Apr 2026 |
| Latest permit | Hilcorp Energy CompanyFeb 1, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 13,500
- total depth, ft
- 1
- permits on file
- Feb 1, 2011
- last permit issued
- Jul 17, 2011
- completed
- 938K
- cumulative oil, bbl
- 2.44M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2010 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jul 17, 2011
- 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 15 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Turnbull Unit A O-2-9596 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 9 | 645K | 1.74M | Dec 2010 – Jul 2026 |
| Turnbull Unit F O-2-10656 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 6 | 293K | 708K | Jul 2011 – Jul 2026 |
Oil, barrels lease total
Last 12 months 29,103 · prior 12 49,761(-42%)
Gas, mcf lease total
Last 12 months 88,748 · prior 12 141,840(-37%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyDec 2010 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 709364-99 | Drill | Hilcorp Energy Company | Jan 27, 2011 | Feb 1, 2011 | Apr 30, 2011 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-2-9596 | — | — | — | — |
| — | — O-2-10656 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 415 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 11,070 | -10,655 |
| Austin Chalk | 11,190 | -10,775 |
| Eagle FordEAGLEFORD | 11,530 | -11,115 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,840 | 16,102 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 5,702 | 13.5 | 2,355 S |
| 5.5 | 16,198 | 9.875 | 2,510 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 | Dec 19, 2013 | Oct 6, 2011 | Yes |
| 00 | Mar 6, 2012 | Oct 6, 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 42-255-31857 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-31857 → 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/25531857, documented in the API reference.