TEXAS · WELLS · KARNES COUNTY · YOSKO UNIT LEASE · API 42-255-31792 · DISTRICT 02
Yosko Unit #1H
Karnes County · Eagleville (Eagle Ford-2) field · Shut In · Horizontal
Yosko Unit #1H (API 42-255-31792) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed April 8, 2011 and listed as shut in on the RRC schedule, shut in June 1, 2025.
The RRC has issued one drilling permit (amended once), issued November 16, 2010, permitted to 12,200 ft.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its lease has reported 1.13M barrels of oil and 2.5M mcf of gas since April 2011, last reporting volume in April 2026. The lease carries 4 wells, so these are lease totals, not this well alone.
Operator of record
- 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 Apr 2026 |
| Latest permit | Marathon Oil EF LLCNov 16, 2010 |
- 12,200
- total depth, ft
- 2
- permits on file
- Nov 16, 2010
- last permit issued
- Apr 8, 2011
- completed
- 1.13M
- cumulative oil, bbl
- 2.5M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2011 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 8, 2011
- Shut in
- Jun 1, 2025
- 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; they carry 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Yosko Unit O-2-9848 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 4 | 1.13M | 2.5M | Apr 2011 – Apr 2026 |
Oil, barrels lease total
Last 12 months 8,147 · prior 12 13,340(-39%)
Gas, mcf lease total
Last 12 months 6,113 · prior 12 38,622(-84%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyApr 2011 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 705201-98 | Drill | Marathon Oil EF LLC | Feb 27, 2012 | Nov 16, 2010 | Dec 22, 2010 | 13,500 |
| 705201-99 | Drill | Hilcorp Energy Company | Nov 11, 2010 | Nov 16, 2010 | Dec 10, 2010 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Apr 8, 2011 | Yosko Unit O-2-9848 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | Shut In · shut in Jun 1, 2025 | 12,200 |
Formation tops
As filed on W-2/G-1. Subsea from 372 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | — | — |
| Austin Chalk | — | — |
| Eagle Ford | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,325 | 17,204 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 6,022 | 13.5 | 2,550 S |
| 5.5 | 17,335 | 8.5 | 2,435 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 26, 2012 | Sep 21, 2011 | Yes |
Well logs
2 logs loaded from the RRC's log index, the latest received Mar 30, 2016. 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 |
|---|---|---|---|---|
| RESISTIVITY | TIFF | 11,385 to 17,336 | Mar 30, 2016run Jan 16, 2011 | 0.55 |
| RESISTIVITY | TIFF | 11,350 to 17,336 | Nov 25, 2014run Jan 16, 2011 | 3.36 |
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 42-255-31792 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-31792 → 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/25531792, documented in the API reference.