WELL · 42-123-35122 · DISTRICT 2
Afflerbach 01 - R01 - M01 D #04H
DE Witt County · DE Witt (Eagle Ford Shale) field · Producing · Horizontal
Afflerbach 01 - R01 - M01 D #04H (API 42-123-35122) is a horizontal well in De Witt County operated by Marathon Oil EF LLC, completed April 1, 2022 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued October 21, 2021, permitted to 25,000 ft.
It was permitted by Ensign Operating LLC and has since transferred to Marathon Oil EF LLC on the wellbore schedule.
Completion filings report 8 formation tops, including Wilcox, Austin Chalk, Eagle Ford, Catahoula.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Ensign Operating LLC; the EWA schedule now lists a different operator.
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 Apr 2026 |
| Latest permit | Ensign Operating LLCOct 21, 2021 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 25,000
- total depth, ft
- 1
- permits on file
- Oct 21, 2021
- last permit issued
- Apr 1, 2022
- completed
- 0
- cumulative oil, bbl
- 2.68M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2022 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 1, 2022
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
Surface location
29.023388, -97.536484
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in DE Witt County.
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 |
|---|---|---|---|---|---|---|
| Afflerbach 01 - R01 - M01 D G-2-292591 | DE Witt (Eagle Ford Shale) | Marathon Oil EF LLC | 1 | 0 | 2.68M | Apr 2022 – Jul 2026 |
Gas, mcf lease total
Last 12 months 200,032 · prior 12 254,063(-21%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Ensign Operating LLCApr 2022 → Feb 2023
- 2Marathon Oil EF LLCMar 2023 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 873309-99 | Drill | Ensign Operating LLC | Oct 1, 2021 | Oct 21, 2021 | Nov 17, 2021 | 25,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-2-292591 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 325 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Wilcox | 6,345 | -6,020 |
| Austin Chalk | 13,234 | -12,909 |
| Eagle Ford | 13,548 | -13,223 |
| Catahoula | — | — |
| EdwardsEDWARDS - H2S | — | — |
| Frio | — | — |
| Vicksburg | — | — |
| Yegua | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 14,012 | 21,213 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 4,534 | 12.25 | 1,466 S |
| 5.5 | 21,189 | 8.75 | 4,443 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 | Jun 15, 2022 | May 4, 2022 | 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 42-123-35122 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-123-35122 → 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.
Afflerbach 01 - R01 - M01 C42-123-35121
0.0 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,300 | -5,975 |
| Austin Chalk | 13,224 | -12,899 |
| Eagle Ford | 13,550 | -13,225 |
| Edwards | — | |
| Catahoula | — | |
| Frio | — | |
| Yegua | — | |
| Vicksburg | — |
Afflerbach 01 - R01 - M01 B42-123-35120
0.0 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,270 | -5,945 |
| Austin Chalk | 13,274 | -12,949 |
| Eagle Ford | 13,553 | -13,228 |
| Vicksburg | — | |
| Frio | — | |
| Yegua | — | |
| Catahoula | — | |
| Edwards | — |
Afflerbach 01 - R01 - M01 A42-123-35119
0.0 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,298 | -5,973 |
| Austin Chalk | 13,260 | -12,935 |
| Eagle Ford | 13,554 | -13,229 |
| Vicksburg | — | |
| Frio | — | |
| Yegua | — | |
| Catahoula | — | |
| Edwards | — |
Afflerbach 01 - R01 - G01 A42-123-35118
0.0 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,286 | -5,962 |
| Austin Chalk | 13,260 | -12,936 |
| Eagle Ford | 13,548 | -13,224 |
| Yegua | — | |
| Vicksburg | — | |
| Catahoula | — | |
| Edwards | — | |
| Frio | — |
Koopman-Lang (a) 0142-123-34369
0.3 KM · Pioneer Natural Res. USA, Inc. · Section with this well →
| Frio | 1,189 | -861 |
| Vicksburg | 2,509 | -2,181 |
| Yegua | 3,619 | -3,291 |
| Wilcox | 6,340 | -6,012 |
| Austin Chalk | 13,250 | -12,922 |
| Eagle Ford | 13,544 | -13,216 |
| Edwards | — | |
| Catahoula | — |
Straube 01 - LS02 A42-123-35075
2.2 KM · Ensign Operating LLC · Section with this well →
| Yegua | 3,140 | -2,796 |
| Wilcox | 6,130 | -5,786 |
| Austin Chalk | 13,089 | -12,745 |
| Eagle Ford | 13,403 | -13,059 |
| Vicksburg | — | |
| Edwards | — | |
| Catahoula | — | |
| Frio | — |
Straube 01 - W01 A42-123-35077
2.3 KM · Ensign Operating LLC · Section with this well →
| Yegua | 3,140 | -2,797 |
| Wilcox | 12,944 | -12,601 |
| Austin Chalk | 13,102 | -12,759 |
| Eagle Ford | 13,455 | -13,112 |
| Edwards | — | |
| Vicksburg | — | |
| Frio | — | |
| Catahoula | — |
Straube 01 - W01 B42-123-35078
2.3 KM · Ensign Operating LLC · Section with this well →
| Yegua | 3,140 | -2,798 |
| Wilcox | 6,151 | -5,809 |
| Austin Chalk | 13,107 | -12,765 |
| Eagle Ford | 13,456 | -13,114 |
| Catahoula | — | |
| Vicksburg | — | |
| Frio | — | |
| Edwards | — |
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/12335122, documented in the API reference.