WELL · 42-123-35348 · DISTRICT 2
Koopman 01-L 01-S 01-a 01 SA2 #02H
DE Witt County · DE Witt (Eagle Ford Shale) field · Producing · Horizontal
Koopman 01-L 01-S 01-A 01 Sa2 #02H (API 42-123-35348) is a horizontal well in De Witt County operated by Marathon Oil EF LLC, completed April 10, 2024 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued December 8, 2023, permitted to 22,000 ft.
Completion filings report 11 formation tops, including Queen City, Reklaw, Wilcox, Yegua.
No lease production has been reported under this well’s leases.
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 Apr 2026 |
| Latest permit | Marathon Oil EF LLCDec 8, 2023 |
- 22,000
- total depth, ft
- 1
- permits on file
- Dec 8, 2023
- last permit issued
- Apr 10, 2024
- completed
- 0
- cumulative oil, bbl
- 3.74M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Feb 2024 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 10, 2024
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
Surface location
29.038559, -97.556449
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 |
|---|---|---|---|---|---|---|
| Koopman 01-L 01-S 01-a 01 SA2 G-2-296675 | DE Witt (Eagle Ford Shale) | Marathon Oil EF LLC | 1 | 0 | 3.74M | Feb 2024 – Jul 2026 |
Gas, mcf lease total
Last 12 months 1,127,272 · prior 12 2,560,768(-56%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCApr 2024 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 895555-99 | Drill | Marathon Oil EF LLC | Nov 28, 2023 | Dec 8, 2023 | Jan 3, 2024 | 22,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-2-296675 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 370 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 5,504 | -5,134 |
| Reklaw | 5,852 | -5,482 |
| Wilcox | 6,108 | -5,738 |
| Yegua | 6,108 | -5,738 |
| Anacacho | 12,793 | -12,423 |
| Wilcox | 12,793 | -12,423 |
| Austin Chalk | 12,985 | -12,615 |
| Eagle Ford | 13,316 | -12,946 |
| Catahoula | — | — |
| EdwardsEDWARDS - H2S | — | — |
| Frio | — | — |
| Vicksburg | — | — |
| Yegua | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 13,543 | 22,359 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,815 | 12.25 | 1,360 S |
| 5.5 | 22,359 | 8.75 | 3,440 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 | Aug 14, 2024 | Jul 12, 2024 | — |
| 00 | Jun 20, 2024 | May 24, 2024 | — |
| 00 | Apr 18, 2024 | Apr 10, 2024 | 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 42-123-35348 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-123-35348 → 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.
Koopman 01-L 01-S 01-a 01 SA142-123-35347
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Wilcox | 618 | -248 |
| Queen City | 5,504 | -5,134 |
| Reklaw | 5,852 | -5,482 |
| Anacacho | 12,799 | -12,429 |
| Austin Chalk | 12,990 | -12,620 |
| Eagle Ford | 13,322 | -12,952 |
| Frio | — | |
| Yegua | — |
11 TOPS · FIRST 8
Koopman 01 - Lang 01 H42-123-34973
0.1 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,214 | -5,841 |
| Austin Chalk | 13,000 | -12,627 |
| Eagle Ford | 13,333 | -12,960 |
| Vicksburg | — | |
| Frio | — | |
| Yegua | — | |
| Catahoula | — | |
| Edwards | — |
Koopman 01 - Lang 01 F42-123-34971
0.1 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,214 | -5,842 |
| Austin Chalk | 13,023 | -12,651 |
| Eagle Ford | 13,356 | -12,984 |
| Vicksburg | — | |
| Frio | — | |
| Yegua | — | |
| Catahoula | — | |
| Edwards | — |
Koopman 01 - Lang 01 D42-123-34968
0.1 KM · Ensign Operating LLC · Section with this well →
| Wilcox | 6,223 | -5,851 |
| Austin Chalk | 13,027 | -12,655 |
| Eagle Ford | 13,355 | -12,983 |
| Catahoula | — | |
| Edwards | — | |
| Frio | — | |
| Vicksburg | — | |
| Yegua | — |
Koopman-Lang (a) 0142-123-34369
2.3 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 | — |
Adix Unit A42-123-34687
2.4 KM · Burlington Resources O & G Co LP · Section with this well →
| Yegua | 2,837 | -2,386 |
| Wilcox | 5,945 | -5,494 |
| Austin Chalk | 12,759 | -12,308 |
| Vicksburg | — | |
| Edwards | — | |
| Eagle Ford | — | |
| Catahoula | — | |
| Frio | — |
Adix Unit A42-123-34701
2.4 KM · Burlington Resources O & G Co LP · Section with this well →
| Yegua | 2,836 | -2,385 |
| Wilcox | 5,947 | -5,496 |
| Austin Chalk | 12,702 | -12,251 |
| Eagle Ford | 13,040 | -12,589 |
| Vicksburg | — | |
| Frio | — | |
| Edwards | — | |
| Catahoula | — |
Adix Unit A42-123-34700
2.4 KM · Burlington Resources O & G Co LP · Section with this well →
| Yegua | 2,835 | -2,384 |
| Wilcox | 5,948 | -5,497 |
| Austin Chalk | 12,831 | -12,380 |
| Eagle Ford | 13,304 | -12,853 |
| Edwards | — | |
| Frio | — | |
| Vicksburg | — | |
| Catahoula | — |
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/12335348, documented in the API reference.