TEXAS · WELLS · ATASCOSA COUNTY · RETZLOFF-MAY UNIT LEASE · API 42-013-34416 · DISTRICT 01
Retzloff-May Unit #1H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Retzloff-May Unit #1H (API 42-013-34416) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed June 14, 2013 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 17, 2011, permitted to 11,162 ft.
It was permitted by Hilcorp Energy Company and has since transferred to Marathon Oil EF LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Anacacho, Austin Chalk, Eagle Ford, Ef.
Its lease has reported 147K barrels of oil and 181K 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 17, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,162
- total depth, ft
- 1
- permits on file
- Aug 17, 2011
- last permit issued
- Jun 14, 2013
- completed
- 147K
- cumulative oil, bbl
- 181K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2011 THROUGH Nov 2025
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jun 14, 2013
- 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 |
|---|---|---|---|---|---|---|
| Retzloff-May Unit O-1-15694 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 1 | 147K | 181K | Oct 2011 – Nov 2025 |
Oil, barrels lease total
Last 12 months 271 · prior 12 1,036(-74%)
Gas, mcf lease total
Last 12 months 263 · prior 12 184(+43%)
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 → Sep 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 722320-99 | Drill | Hilcorp Energy Company | Aug 15, 2011 | Aug 17, 2011 | Aug 30, 2011 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jun 14, 2013 | Retzloff-May Unit O-1-15694 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Producing | 11,162 |
Formation tops
As filed on W-2/G-1. Subsea from 388 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 10,430 | -10,042 |
| Anacacho | 10,510 | -10,122 |
| Austin ChalkAUSTIN | 10,680 | -10,292 |
| Austin Chalk | 10,680 | -10,292 |
| Eagle Ford | 10,880 | -10,492 |
| EF | 10,880 | -10,492 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,081 | 15,722 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 5,318 | 13.5 | 2,230 S |
| 5.5 | 15,823 | 8.5 | 2,235 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 | Feb 19, 2020 | Oct 30, 2019 | — |
| 00 | Apr 19, 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 42-013-34416 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-34416 → 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/01334416, documented in the API reference.