TEXAS · WELLS · KARNES COUNTY · WINGNUT UNIT 'B' LEASE · API 42-255-32927 · DISTRICT 02
Wingnut Unit B #4H
Karnes County · Eagleville (Eagle Ford-2) field · Shut In · Horizontal
Wingnut Unit B #4H (API 42-255-32927) is a horizontal well in Karnes County operated by Ensign Natural Resources II LLC, completed November 22, 2015 and listed as shut in on the RRC schedule, shut in December 1, 2020.
The RRC has issued one drilling permit, issued January 2, 2013, permitted to 12,374 ft.
It was permitted by Marathon Oil EF LLC and has since transferred to Ensign Natural Resources II LLC on the wellbore schedule.
Completion filings report 7 formation tops, including Wilcox, Midway, Escondido, Olmos.
Its lease has reported 3.13M barrels of oil and 4.97M mcf of gas since December 2012, last reporting in July 2026. The lease carries 10 wells, so these are lease totals, not this well alone.
Operator of record
Ensign Natural Resources II LLC
Permitted by Marathon Oil EF LLC; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jun 29, 2026
- Permits on file
- 13
- Phone
- (346) 809-4062
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Ensign Natural Resources II LLC |
| Production reports | Marathon Oil EF LLCthrough Apr 2026 |
| Latest permit | Marathon Oil EF LLCJan 2, 2013 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,374
- total depth, ft
- 1
- permits on file
- Jan 2, 2013
- last permit issued
- Nov 22, 2015
- completed
- 3.13M
- cumulative oil, bbl
- 4.97M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2012 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 22, 2015
- Shut in
- Dec 1, 2020
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 10 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Wingnut Unit 'B' O-2-10366 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 10 | 3.13M | 4.97M | Dec 2012 – Jul 2026 |
Oil, barrels lease total
Last 12 months 64,611 · prior 12 75,692(-15%)
Gas, mcf lease total
Last 12 months 129,529 · prior 12 158,684(-18%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCJan 2013 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 753726-99 | Drill | Marathon Oil EF LLC | Dec 21, 2012 | Jan 2, 2013 | May 6, 2013 | 18,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 22, 2015 | Wingnut Unit B O-2-10366 | Eagleville (Eagle Ford-2) | Ensign Natural Resources II LLC | Shut In · shut in Dec 1, 2020 | 12,374 |
Formation tops
As filed on W-2/G-1. Subsea from 502 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Wilcox | 4,753 | -4,251 |
| Midway | 8,848 | -8,346 |
| Escondido | 9,865 | -9,363 |
| Olmos | 10,393 | -9,891 |
| Anacacho | 11,389 | -10,887 |
| Austin Chalk | 11,590 | -11,088 |
| Eagle Ford | 12,007 | -11,505 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,469 | 17,446 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 3,975 | 12.25 | 925 S |
| 5.5 | 17,535 | 8.5 | 1,995 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 15, 2016 | Nov 18, 2016 | — |
| 00 | Dec 12, 2016 | Nov 18, 2016 | — |
| 00 | Aug 26, 2013 | Jun 18, 2013 | 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 42-255-32927 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-32927 → 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/25532927, documented in the API reference.