TEXAS · WELLS · ATASCOSA COUNTY · MIDDLE MCCOWEN LEASE · API 42-013-34484 · DISTRICT 01
Middle McCowen #12H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Middle Mccowen #12H (API 42-013-34484) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed January 18, 2017 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued March 21, 2012, permitted to 11,082 ft.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
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 LLCMar 21, 2012 |
- 11,082
- total depth, ft
- 1
- permits on file
- Mar 21, 2012
- last permit issued
- Jan 18, 2017
- 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
- Jan 18, 2017
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
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%)
Wells named Middle McCowen
Marathon Oil EF LLC's other wells filed under this lease name in Atascosa County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain 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 |
|---|---|---|---|---|---|---|
| 734689-99 | Drill | Marathon Oil EF LLC | Feb 24, 2012 | Mar 21, 2012 | Aug 5, 2012 | 18,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 18, 2017 | Middle McCowen O-1-15638 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Injection | 11,082 |
| Jan 18, 2017 | Middle McCowen O-1-15638 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Producing | 11,082 |
Formation tops
As filed on W-2/G-1. Subsea from 284 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 10,498 | -10,214 |
| Austin Chalk | 10,761 | -10,477 |
| Eagle Ford | 10,877 | -10,593 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,500 | 17,467 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,175 | 12.25 | 1,240 S |
| 5.5 | 18,014 | 8.75 | 3,635 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 21, 2017 | Sep 21, 2017 | — |
| 00 | Jan 30, 2017 | Jan 25, 2017 | — |
| 00 | Jan 24, 2017 | Jan 18, 2017 | — |
| 00 | Nov 8, 2012 | Sep 18, 2012 | Yes |
| 00 | Sep 5, 2012 | Jul 30, 2012 | Yes |
Well logs
4 logs loaded from the RRC's log index, the latest received Oct 7, 2015. Density, Neutron, Resistivity. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| RESISTIVITYSpans Anacacho, Austin Chalk, Eagle Ford | 6 TIFF | 9,282 to 17,966 | Oct 7, 2015run Apr 30, 2012 | 1.26 + 2.03 + 0.95 + 0.76 + 4.59 + 1.44 |
| RESISTIVITYSpans Anacacho, Austin Chalk, Eagle Ford | 6 TIFF | 9,517 to 11,491 | Oct 7, 2015run Apr 12, 2012 | 1.23 + 0.73 + 0.57 + 0.54 + 1.01 + 0.68 |
| COMBINATION: RESISTIVITY/NEUTRON/DENSITY POROSITYSpans Anacacho, Austin Chalk, Eagle Ford | TIFF | 5,184 to 11,149 | Oct 7, 2015run Apr 6, 2012 | 12.2 |
| RESISTIVITYSpans Anacacho, Austin Chalk, Eagle Ford | 3 TIFF | 5,184 to 11,149 | Oct 7, 2015run Apr 6, 2012 | 1.56 + 5.97 + 25.7 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-013-34484 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-34484 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it.
Beyond the permit record
RRC UIC permits · H-10 reported volumes
Injection
- 0
- bbl, last 12 reported months
- 0
- bbl, all reported
- —
- reported through
| UIC | Kind | Status | Permitted bbl/d | Max psi | Zone ft |
|---|---|---|---|---|---|
| 000115356 | H-1 Injection | Canceled Mar 21, 2018 | 0 | 0 | 10,963–11,077 |
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/01334484, documented in the API reference.