TEXAS · WELLS · DE WITT COUNTY · KOOPMAN-LANG (A) 01 LEASE · API 42-123-34374 · DISTRICT 02
Koopman-Lang (a) 01 #02H
De Witt County · De Witt (Eagle Ford Shale) field · Temp Abandoned · Horizontal
Koopman-Lang (A) 01 #02H (API 42-123-34374) is a horizontal well in De Witt County operated by Marathon Oil EF LLC, completed July 26, 2017 and listed as temp abandoned on the RRC schedule, shut in January 1, 2026.
The RRC has issued one drilling permit, issued February 14, 2017, permitted to 13,677 ft.
It was permitted by Pioneer Natural Res. USA, Inc. and has since transferred to Marathon Oil EF LLC on the wellbore schedule.
Completion filings report 8 formation tops, including Frio, Vicksburg, Yegua, Wilcox.
Its lease has reported 483K barrels of oil and 3.29M mcf of gas since July 2017, last reporting volume in December 2025.
Operator of record
Permitted by Pioneer Natural Res. USA, Inc.; 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 Dec 2025 |
| Latest permit | Pioneer Natural Res. USA, Inc.Feb 14, 2017 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 13,677
- total depth, ft
- 1
- permits on file
- Feb 14, 2017
- last permit issued
- Jul 26, 2017
- completed
- 483K
- cumulative oil, bbl
- 3.29M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jul 2017 THROUGH Dec 2025
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 26, 2017
- Shut in
- Jan 1, 2026
- 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 |
|---|---|---|---|---|---|---|
| Koopman-Lang (a) 01 G-2-283612 | De Witt (Eagle Ford Shale) | Marathon Oil EF LLC | 1 | 483K | 3.29M | Jul 2017 – Dec 2025 |
Gas, mcf lease total
Last 12 months 34,160 · prior 12 69,847(-51%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Pioneer Natural Res. USA, Inc.Jul 2017 → Sep 2019
- 2Ensign Operating LLCOct 2019 → Feb 2023
- 3Marathon Oil EF LLCMar 2023 → Dec 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 822855-99 | Drill | Pioneer Natural Res. USA, Inc. | Feb 3, 2017 | Feb 14, 2017 | Mar 18, 2017 | 25,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 26, 2017 | Koopman-Lang (a) 01 G-2-283612 | De Witt (Eagle Ford Shale) | Marathon Oil EF LLC | Temp Abandoned · shut in Jan 1, 2026 | 13,677 |
Formation tops
As filed on W-2/G-1. Subsea from 328 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Frio | 1,249 | -921 |
| Vicksburg | 2,449 | -2,121 |
| Yegua | 3,617 | -3,289 |
| Wilcox | 6,340 | -6,012 |
| Austin Chalk | 13,096 | -12,768 |
| Eagle Ford | 13,544 | -13,216 |
| Catahoula | — | — |
| EdwardsEDWARDS - H2S | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 13,830 | 20,822 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 4,469 | 12.25 | 1,340 S |
| 5.5 | 21,055 | 8.75 | 3,705 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 | Mar 28, 2018 | Sep 15, 2017 | Yes |
Well logs
2 logs loaded from the RRC's log index, the latest received Mar 16, 2020. Gamma ray, Resistivity. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| Gamma RaySpans Yegua, Wilcox, Austin Chalk, Eagle Ford | TIFF | 4,426 to 14,059 | Mar 12, 2018 | 3.03 |
| RESISTIVITYSpans Frio, Vicksburg, Yegua, Wilcox, Austin Chalk, Eagle Ford | TIFF | 0 to 14,000 | Mar 16, 2020 | 0.91 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-123-34374 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-123-34374 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search 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/12334374, documented in the API reference.