TEXAS · WELLS · KARNES COUNTY · API 42-255-31732 · DISTRICT 02
May Unit 1 AC #1H
Karnes County · Sugarkane (Austin Chalk) field · SWR-10-Well · Horizontal
May Unit 1 AC #1H (API 42-255-31732) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed November 13, 2010 and listed as swr-10-well on the RRC schedule.
The RRC has issued 2 drilling permits between 2010 and 2012, permitted to 12,199 ft.
Completion filings report 5 formation tops, including Anacacho, Pecan Gap, Austin Chalk, Eagle Ford.
Its 2 leases have reported 275K barrels of oil and 1.02M mcf of gas since September 2010, last reporting volume in April 2026. 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 Apr 2026 |
| Latest permit | Marathon Oil EF LLCApr 25, 2012 |
- 12,199
- total depth, ft
- 2
- permits on file
- Apr 25, 2012
- last permit issued
- Nov 13, 2010
- completed
- 275K
- cumulative oil, bbl
- 1.02M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 2010 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 13, 2010
- Shut in
- —
- 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 |
|---|---|---|---|---|---|---|
| May Unit 1 G-2-259818 | Sugarkane (Eagle Ford) | Marathon Oil EF LLC | 1 | 266K | 981K | Sep 2010 – Apr 2026 |
| May Unit 1 AC G-2-265086 | Sugarkane (Austin Chalk) | Marathon Oil EF LLC | 1 | 8.59K | 34.3K | Nov 2010 – May 2012 |
Gas, mcf lease total
Last 12 months 6,076 · prior 12 8,133(-25%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyNov 2010 → Oct 2011
- 2Marathon Oil EF LLCNov 2010 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 738062-99 | Recompletion | Marathon Oil EF LLC | Apr 12, 2012 | Apr 25, 2012 | Oct 1, 2010 | 17,553 |
| 701436-99 | Drill | Hilcorp Energy Company | Aug 30, 2010 | Sep 1, 2010 | Sep 5, 2010 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 13, 2010 | May Unit 1 AC G-2-265086 | Sugarkane (Austin Chalk) | Marathon Oil EF LLC | SWR-10-Well · shut in Jun 1, 2012 | 12,199 |
| Nov 13, 2010 | May Unit 1 G-2-259818 | Sugarkane (Eagle Ford) | Marathon Oil EF LLC | Producing | 12,199 |
Formation tops
As filed on W-2/G-1. Subsea from 388 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 12,019 | -11,631 |
| Anacacho | 12,020 | -11,632 |
| Pecan Gap | 12,119 | -11,731 |
| Austin Chalk | 12,150 | -11,762 |
| Austin Chalk | 12,151 | -11,763 |
| Eagle Ford | 12,292 | -11,904 |
| Upper Eagle | 12,294 | -11,906 |
| Eagle FordEAGLEFORD | 12,328 | -11,940 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,030 | 16,872 | Perforated |
| 12,151 | 12,292 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 5,810 | 13.5 | 2,245 S |
| 5.5 | 17,008 | 8.5 | 2,725 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 30, 2012 | Jul 10, 2012 | — |
| 00 | Oct 29, 2012 | Jul 21, 2011 | — |
| 00 | May 25, 2011 | Dec 2, 2010 | 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 42-255-31732 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-31732 → 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/25531732, documented in the API reference.