WELL · 42-013-34409 · DISTRICT 1
Retzloff-Tom Unit #1H
Atascosa County · Eagleville (Eagle Ford-2) field · Horizontal
Retzloff-Tom Unit #1H (API 42-013-34409) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed October 11, 2011.
The RRC has issued 2 drilling permits between 2011 and 2019, permitted to 16,000 ft.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its 2 leases have reported 112K barrels of oil and 144K mcf of gas since October 2011, last reporting in July 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Houston, TX · P-5 Y, filed Aug 4, 2025 · 3,191 permits on file · (800) 332-9449
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Marathon Oil EF LLC |
| Production reports | Marathon Oil EF LLCthrough Dec 2021 |
| Latest permit | Marathon Oil EF LLCAug 21, 2019 |
- 16,000
- total depth, ft
- 2
- permits on file
- Aug 21, 2019
- last permit issued
- Oct 11, 2011
- completed
- 112K
- cumulative oil, bbl
- 144K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Oct 11, 2011
- Shut in
- —
- Plugged
- —
Surface location
28.747583, -98.177462
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Atascosa County.
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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Retzloff-Tom Unit O-1-19777 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 1 | 16.2K | 23.8K | Sep 2017 – Jul 2026 |
| Retzloff-Tom Unit O-2-9811 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 1 | 95.5K | 120K | Oct 2011 – Sep 2019 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyOct 2011 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Dec 2021
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 855965-99 | Field transfer | Marathon Oil EF LLC | Aug 6, 2019 | Aug 21, 2019 | Jul 29, 2019 | 16,000 |
| 721624-99 | Drill | Hilcorp Energy Company | Aug 4, 2011 | Aug 9, 2011 | Sep 17, 2011 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-19777 | — | — | — | — |
| — | — O-2-9811 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 389 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 10,500 | -10,111 |
| Austin ChalkAUSTIN | 10,660 | -10,271 |
| Austin Chalk | 10,660 | -10,271 |
| Eagle Ford | 10,787 | -10,398 |
| Eagle Ford | 10,870 | -10,481 |
| Eagle FordEAGLEFORD | 10,870 | -10,481 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,031 | 14,632 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 5,318 | 13.5 | 2,225 S |
| 5.5 | 14,730 | 8.5 | 2,100 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 | Sep 30, 2024 | Aug 19, 2024 | — |
| 00 | Sep 15, 2023 | Sep 5, 2023 | — |
| 00 | Sep 30, 2019 | Aug 31, 2019 | Yes |
| 00 | Mar 7, 2012 | Nov 7, 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 42-013-34409 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-34409 → 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.
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 neighbours, subsea-aligned so they line up regardless of surface terrain.
Tom Family-Retzloff SA342-013-35830
0.5 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,714 | -2,296 |
| Reklaw | 3,294 | -2,876 |
| Carrizo | 3,969 | -3,551 |
| Wilcox | 4,044 | -3,626 |
| Olmos | 9,054 | -8,636 |
| Anacacho | 10,449 | -10,031 |
| Austin Chalk | 10,612 | -10,194 |
| Bartosh | — |
10 TOPS · FIRST 8
Tom Family-Retzloff SA242-013-35829
0.5 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,714 | -2,295 |
| Reklaw | 3,294 | -2,875 |
| Carrizo | 3,696 | -3,277 |
| Wilcox | 4,044 | -3,625 |
| Olmos | 9,054 | -8,635 |
| Anacacho | 10,445 | -10,026 |
| Austin Chalk | 10,608 | -10,189 |
| Escondido | — |
10 TOPS · FIRST 8
Tom Family-Retzloff SA142-013-35828
0.5 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,714 | -2,295 |
| Reklaw | 3,294 | -2,875 |
| Carrizo | 3,969 | -3,550 |
| Wilcox | 4,044 | -3,625 |
| Olmos | 9,054 | -8,635 |
| Anacacho | 10,450 | -10,031 |
| Austin Chalk | 10,610 | -10,191 |
| Navarro | — |
10 TOPS · FIRST 8
Retzloff May-Mauch Krueger SA42-013-35978
1.1 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,617 | -2,190 |
| Reklaw | 3,171 | -2,744 |
| Carrizo | 3,985 | -3,558 |
| Wilcox | 4,061 | -3,634 |
| Anacacho | 10,409 | -9,982 |
| Austin Chalk | 10,574 | -10,147 |
| Escondido | — | |
| Olmos | — |
10 TOPS · FIRST 8
Mauch Tom Krueger-Ethridge SA42-013-35977
1.1 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 1,791 | -1,389 |
| Reklaw | 3,171 | -2,769 |
| Carrizo | 3,895 | -3,493 |
| Wilcox | 4,061 | -3,659 |
| Anacacho | 10,408 | -10,006 |
| Austin Chalk | 10,571 | -10,169 |
| Olmos | — | |
| Navarro | — |
10 TOPS · FIRST 8
Mauch Tom Krueger SA242-013-35976
1.1 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,617 | -2,215 |
| Reklaw | 3,171 | -2,769 |
| Carrizo | 3,985 | -3,583 |
| Wilcox | 4,061 | -3,659 |
| Anacacho | 10,409 | -10,007 |
| Austin Chalk | 10,569 | -10,167 |
| Escondido | — | |
| Bartosh | — |
10 TOPS · FIRST 8
Retzloff Tom-May Psa A42-013-35667
1.6 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 3,095 | -2,738 |
| Reklaw | 3,457 | -3,100 |
| Bartosh | 3,661 | -3,304 |
| Carrizo | 4,104 | -3,747 |
| Wilcox | 5,439 | -5,082 |
| Navarro | 8,777 | -8,420 |
| Olmos | 9,287 | -8,930 |
| Anacacho | 10,713 | -10,356 |
10 TOPS · FIRST 8
Retzloff Tom-May Psa B42-013-35668
1.6 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 3,095 | -2,737 |
| Reklaw | 3,457 | -3,099 |
| Bartosh | 3,661 | -3,303 |
| Carrizo | 4,104 | -3,746 |
| Wilcox | 5,439 | -5,081 |
| Navarro | 8,777 | -8,419 |
| Olmos | 9,287 | -8,929 |
| Escondido | 9,287 | -8,929 |
10 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/01334409, documented in the API reference.