TEXAS · WELLS · ATASCOSA COUNTY · MIDDLE MCCOWEN LEASE · API 42-013-35961 · DISTRICT 01
Middle McCowen #311H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Middle Mccowen #311H (API 42-013-35961) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed July 12, 2023 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued December 12, 2022, permitted to 10,753 ft.
Completion filings report 12 formation tops, including Queen City, Reklaw, Carrizo, Wilcox.
Its lease has reported 30.4M barrels of oil and 24.8M mcf of gas since August 2011, last reporting volume in April 2026. The lease carries 125 wells, so these are lease totals, not this well alone.
Operator of record
- 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 | Marathon Oil EF LLCDec 12, 2022 |
- 10,753
- total depth, ft
- 1
- permits on file
- Dec 12, 2022
- last permit issued
- Jul 12, 2023
- completed
- 30.4M
- cumulative oil, bbl
- 24.8M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Sep 2011 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 12, 2023
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
Surface location
28.663611, -98.373178 NAD27, as filed
28.663874, -98.373469 WGS84
Permit surface location from the RRC GIS record, referenced to NAD27 as the RRC files it; the WGS84 pair is the same point through NOAA's NADCON grid, and the map link uses it, in Atascosa County.
Wells nearby
Every well with a location on file around this one, in any state, nearest first.
Loading the wells nearby…
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
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 125 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Middle McCowen O-1-15638 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 125 | 30.4M | 24.8M | Aug 2011 – Apr 2026 |
Oil, barrels lease total
Last 12 months 4,281,756 · prior 12 5,967,262(-28%)
Gas, mcf lease total
Last 12 months 3,027,282 · prior 12 4,175,011(-27%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanySep 2011 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 886205-99 | Drill | Marathon Oil EF LLC | Dec 5, 2022 | Dec 12, 2022 | Jan 8, 2023 | 26,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 12, 2023 | Middle McCowen O-1-15638 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Producing | 10,753 |
Formation tops
As filed on W-2/G-1. Subsea from 264 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 2,201 | -1,937 |
| Reklaw | 2,846 | -2,582 |
| Carrizo | 3,615 | -3,351 |
| WilcoxWILCOX - DISPOSAL | 3,716 | -3,452 |
| AnacachoANACACHO - H2S | 10,054 | -9,790 |
| Austin ChalkAUSTIN CHALK - H2S, DISPOSAL | 10,262 | -9,998 |
| Eagle FordEAGLE FORD - H2S | 10,459 | -10,195 |
| Bartosh | — | — |
| BudaBUDA - H2S | — | — |
| EscondidoESCONDIDO - H2S, DISPOSAL | — | — |
| NavarroNAVARRO - H2S | — | — |
| OlmosOLMOS - DISPOSAL | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,893 | 18,430 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,017 | 12.25 | 1,241 S |
| 6 | 10,753 | 8.75 | 2,930 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Sep 8, 2023 | Aug 28, 2023 | Yes |
| 00 | Sep 1, 2023 | Aug 10, 2023 | 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 42-013-35961 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-35961 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here for it.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well's tops beside its 5 nearest neighbors, subsea-aligned so they line up regardless of surface terrain.
Middle McCowen42-013-35960
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,201 | -1,937 |
| Reklaw | 2,846 | -2,582 |
| Carrizo | 3,615 | -3,351 |
| Wilcox | 3,716 | -3,452 |
| Anacacho | 10,044 | -9,780 |
| Austin Chalk | 10,253 | -9,989 |
| Escondido | — | |
| Bartosh | — |
10 TOPS · FIRST 8
Middle McCowen42-013-35962
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,201 | -1,937 |
| Reklaw | 2,846 | -2,582 |
| Carrizo | 3,615 | -3,351 |
| Wilcox | 3,716 | -3,452 |
| Anacacho | 10,065 | -9,801 |
| Austin Chalk | 10,274 | -10,010 |
| Escondido | — | |
| Olmos | — |
10 TOPS · FIRST 8
Middle McCowen42-013-35963
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,201 | -1,937 |
| Reklaw | 2,846 | -2,582 |
| Carrizo | 3,615 | -3,351 |
| Wilcox | 3,716 | -3,452 |
| Anacacho | 10,057 | -9,793 |
| Austin Chalk | 10,274 | -10,010 |
| Escondido | — | |
| Bartosh | — |
10 TOPS · FIRST 8
Middle McCowen42-013-35964
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,201 | -1,937 |
| Reklaw | 2,846 | -2,582 |
| Carrizo | 3,615 | -3,351 |
| Wilcox | 3,716 | -3,452 |
| Anacacho | 10,037 | -9,773 |
| Austin Chalk | 10,244 | -9,980 |
| Bartosh | — | |
| Olmos | — |
10 TOPS · FIRST 8
Middle McCowen42-013-35080
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 830 | -566 |
| Cook Mountain | 1,278 | -1,014 |
| Carrizo | 1,580 | -1,316 |
| Reklaw | 1,900 | -1,636 |
| Bartosh | 3,150 | -2,886 |
| Wilcox | 3,718 | -3,454 |
| Wilcox | 3,718 | -3,454 |
| Anacacho | 10,046 | -9,782 |
15 TOPS · FIRST 8
Middle McCowen42-013-35078
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 830 | -565 |
| Cook Mountain | 1,278 | -1,013 |
| Carrizo | 1,580 | -1,315 |
| Reklaw | 1,900 | -1,635 |
| Bartosh | 3,150 | -2,885 |
| Wilcox | 3,718 | -3,453 |
| Wilcox | 3,718 | -3,453 |
| Anacacho | 10,068 | -9,803 |
19 TOPS · FIRST 8
Middle McCowen42-013-35076
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 830 | -566 |
| Carrizo | 1,900 | -1,636 |
| Reklaw | 1,900 | -1,636 |
| Bartosh | 3,150 | -2,886 |
| Wilcox | 3,718 | -3,454 |
| Anacacho | 10,045 | -9,781 |
| Austin Chalk | 10,304 | -10,040 |
| Navarro | — |
10 TOPS · FIRST 8
Middle McCowen42-013-35072
0.1 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 830 | -565 |
| Cook Mountain | 1,278 | -1,013 |
| Carrizo | 1,580 | -1,315 |
| Reklaw | 1,900 | -1,635 |
| Barthosh | 3,150 | -2,885 |
| Bartosh | 3,150 | -2,885 |
| Wilcox | 3,718 | -3,453 |
| Wilcox | 3,718 | -3,453 |
16 TOPS · FIRST 8
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/01335961, documented in the API reference.