TEXAS · WELLS · ATASCOSA COUNTY · MAUCH-TOM UNIT LEASE · API 42-013-34420 · DISTRICT 01
Mauch-Tom Unit #1H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Mauch-Tom Unit #1H (API 42-013-34420) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed November 1, 2011 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 30, 2011, permitted to 10,695 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 lease has reported 127K barrels of oil and 135K mcf of gas since October 2011, last reporting volume in November 2025.
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 Nov 2025 |
| Latest permit | Hilcorp Energy CompanyAug 30, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,695
- total depth, ft
- 1
- permits on file
- Aug 30, 2011
- last permit issued
- Nov 1, 2011
- completed
- 127K
- cumulative oil, bbl
- 135K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2011 THROUGH Nov 2025
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 1, 2011
- 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.
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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mauch-Tom Unit O-1-15685 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 1 | 127K | 135K | Oct 2011 – Nov 2025 |
Oil, barrels lease total
Last 12 months 1,659 · prior 12 1,326(+25%)
Gas, mcf lease total
Last 12 months 157 · prior 12 359(-56%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCOct 2011 → Nov 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 723006-99 | Drill | Hilcorp Energy Company | Aug 24, 2011 | Aug 30, 2011 | Sep 17, 2011 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 1, 2011 | Mauch-Tom Unit O-1-15685 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Producing | 10,695 |
Formation tops
As filed on W-2/G-1. Subsea from 387 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 10,373 | -9,986 |
| Austin Chalk | 10,490 | -10,103 |
| Eagle Ford | 10,771 | -10,384 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,200 | 14,757 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 5,223 | 13.5 | 1,535 S |
| 5.5 | 14,900 | 8.5 | 2,145 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 | Apr 16, 2012 | Jan 18, 2012 | 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 42-013-34420 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-34420 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here for it.
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/01334420, documented in the API reference.