TEXAS · WELLS · KARNES COUNTY · API 42-255-31790 · DISTRICT 02
Foster Unit AC #1H
Karnes County · Sugarkane (Austin Chalk) field · SWR-10-Well · Horizontal
Foster Unit AC #1H (API 42-255-31790) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed March 28, 2011 and listed as swr-10-well on the RRC schedule, shut in July 1, 2024.
The RRC has issued one drilling permit (amended once), issued November 15, 2010, permitted to 12,829 ft.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its 2 leases have reported 119K barrels of oil and 895K mcf of gas since March 2011, last reporting volume in June 2024. The leases carry 2 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 Jun 2024 |
| Latest permit | Marathon Oil EF LLCNov 15, 2010 |
- 12,829
- total depth, ft
- 2
- permits on file
- Nov 15, 2010
- last permit issued
- Mar 28, 2011
- completed
- 119K
- cumulative oil, bbl
- 895K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2011 THROUGH Jun 2024
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 28, 2011
- Shut in
- Jul 1, 2024
- 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 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Foster Unit G-2-265037 | Sugarkane (Eagle Ford) | Marathon Oil EF LLC | 1 | 117K | 882K | Mar 2011 – Jun 2024 |
| Foster Unit AC G-2-265038 | Sugarkane (Austin Chalk) | Marathon Oil EF LLC | 1 | 2.04K | 12.5K | Mar 2011 – May 2012 |
Gas, mcf lease total
Last 12 months 0 · prior 12 1,037(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyApr 2011 → Oct 2011
- 2Marathon Oil EF LLCApr 2011 → Jun 2024
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 705140-98 | Drill | Marathon Oil EF LLC | Apr 30, 2012 | Nov 15, 2010 | Dec 20, 2010 | 18,333 |
| 705140-99 | Drill | Hilcorp Energy Company | Nov 10, 2010 | Nov 15, 2010 | Dec 20, 2010 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Mar 28, 2011 | Foster Unit AC G-2-265038 | Sugarkane (Austin Chalk) | Marathon Oil EF LLC | SWR-10-Well · shut in Jun 1, 2012 | 12,829 |
| Mar 28, 2011 | Foster Unit G-2-265037 | Sugarkane (Eagle Ford) | Marathon Oil EF LLC | Temp Abandoned · shut in Jul 1, 2024 | 12,829 |
Formation tops
As filed on W-2/G-1. Subsea from 337 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 12,230 | -11,893 |
| Austin Chalk | 12,374 | -12,037 |
| Eagle Ford | 12,550 | -12,213 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,654 | 12,736 | Perforated |
| 12,654 | 17,204 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 2,976 | 12.5 | 1,385 S |
| 7.75 | 8,218 | 9.75 | 1,340 S |
| 4.5 | 18,332 | 9.75 | 1,295 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 | Oct 25, 2012 | Jul 10, 2012 | — |
| 00 | Oct 24, 2012 | Sep 6, 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 42-255-31790 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-31790 → 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/25531790, documented in the API reference.