TEXAS · WELLS · ATASCOSA COUNTY · WILHELM-SMITH UNIT A LEASE · API 42-013-34564 · DISTRICT 01
Wilhelm-Smith Unit A #4H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Wilhelm-Smith Unit A #4H (API 42-013-34564) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed December 1, 2012 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued July 17, 2012, permitted to 10,370 ft.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its lease has reported 853K barrels of oil and 948K mcf of gas since August 2012, 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 LLCJul 17, 2012 |
- 10,370
- total depth, ft
- 1
- permits on file
- Jul 17, 2012
- last permit issued
- Dec 1, 2012
- completed
- 853K
- cumulative oil, bbl
- 948K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2012 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 1, 2012
- 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 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 |
|---|---|---|---|---|---|---|
| Wilhelm-Smith Unit A O-1-16354 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 4 | 853K | 948K | Aug 2012 – Apr 2026 |
Oil, barrels lease total
Last 12 months 2,632 · prior 12 6,231(-58%)
Gas, mcf lease total
Last 12 months 1,359 · prior 12 7,272(-81%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCDec 2012 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 744233-99 | Drill | Marathon Oil EF LLC | Jul 9, 2012 | Jul 17, 2012 | Nov 17, 2012 | 17,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 1, 2012 | Wilhelm-Smith Unit A O-1-16354 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Producing | 10,370 |
Formation tops
As filed on W-2/G-1. Subsea from 333 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 10,290 | -9,957 |
| Austin Chalk | 10,506 | -10,173 |
| Austin Chalk | 10,507 | -10,174 |
| Eagle Ford | 10,660 | -10,327 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,972 | 18,288 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,141 | 12.25 | 1,750 S |
| 5.5 | 18,645 | 8.75 | 2,405 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 | Jun 17, 2013 | Apr 11, 2013 | Yes |
| 00 | Mar 11, 2013 | Jan 8, 2013 | Yes |
Well logs
1 log loaded from the RRC's log index, the latest received Jun 28, 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 |
|---|---|---|---|---|
| RESISTIVITYSpans Eagle Ford | TIFF | 11,689 to 16,854 | Jun 28, 2016run Oct 16, 2012 | 0.54 |
"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 42-013-34564 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-34564 → 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/01334564, documented in the API reference.