TEXAS · WELLS · RUSK COUNTY · WILLIAMSON UNIT LEASE · API 42-401-34826 · DISTRICT 06
Williamson Unit #13
Rusk County · Oak Hill (Cotton Valley) field · Temp Abandoned · Vertical
Williamson Unit #13 (API 42-401-34826) is a well in Rusk County operated by Grayrock Energy II LLC, completed August 28, 2008 and listed as temp abandoned on the RRC schedule, shut in March 1, 2024.
The RRC has issued one drilling permit, issued July 9, 2008, permitted to 10,700 ft.
It was permitted by Energen Resources Corporation and has since transferred to Grayrock Energy II LLC on the wellbore schedule.
Completion filings report 6 formation tops, including T. Massive Anhydrite, Rodessa, James Lime, Pettit.
Its lease has reported 2.32K barrels of oil and 629K mcf of gas since August 2008, last reporting volume in February 2024.
Operator of record
Permitted by Energen Resources Corporation; the EWA schedule now lists a different operator.
- Based in
- Fort Worth, TX
- P-5 status
- Active (A)
- P-5 last filed
- Oct 16, 2025
- Phone
- (214) 234-9115
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Grayrock Energy II LLC |
| Production reports | Highmark Energy Operating, LLCthrough Feb 2024 |
| Latest permit | Energen Resources CorporationJul 9, 2008 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,700
- total depth, ft
- 1
- permits on file
- Jul 9, 2008
- last permit issued
- Aug 28, 2008
- completed
- 2.32K
- cumulative oil, bbl
- 629K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2008 THROUGH Feb 2024
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 28, 2008
- Shut in
- Mar 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 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 |
|---|---|---|---|---|---|---|
| Williamson Unit G-6-242622 | Oak Hill (Cotton Valley) | Highmark Energy Operating, LLC | 1 | 2.32K | 629K | Aug 2008 – Feb 2024 |
Gas, mcf lease total
Last 12 months 0 · prior 12 0
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Energen Resources CorporationAug 2008 → May 2014
- 2Highmark Energy Operating, LLCJun 2014 → Feb 2024
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 664870-99 | Drill | Energen Resources Corporation | Jun 19, 2008 | Jul 9, 2008 | Jul 14, 2008 | 11,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 28, 2008 | Williamson Unit G-6-242622 | Oak Hill (Cotton Valley) | Grayrock Energy II LLC | Temp Abandoned · shut in Mar 1, 2024 | 10,700 |
Formation tops
As filed on W-2/G-1. Subsea from 343 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| T. Massive Anhydrite | 5,725 | -5,382 |
| Rodessa | 6,095 | -5,752 |
| James LimeJAMES | 6,465 | -6,122 |
| Pettit | 6,735 | -6,392 |
| T. Travis Peak | 7,055 | -6,712 |
| BossierBOSSIER SHALE | 10,500 | -10,157 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,238 | 10,532 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,156 | 11 | 340 S |
| 4.5 | 10,700 | 7.875 | 960 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 | Dec 16, 2008 | Nov 3, 2008 | Yes |
| 00 | Dec 3, 2008 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Aug 24, 2009. Density, Neutron, 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 |
|---|---|---|---|---|
| COMBINATION: RESISTIVITY/NEUTRON/DENSITY POROSITYSpans T. Massive Anhydrite, Rodessa, James Lime, Pettit, T. Travis Peak, Bossier | TIFF | 1,146 to 10,679 | Aug 24, 2009run Aug 1, 2008 | 14.0 |
"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 42-401-34826 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-401-34826 → 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/40134826, documented in the API reference.