TEXAS · WELLS · COCHRAN COUNTY · DEAN, C. S. "A" LEASE · API 42-079-33065 · DISTRICT 7B
Dean C. S. A #257
Cochran County · Slaughter field · Shut In · Vertical
Dean C. S. A #257 (API 42-079-33065) is a well in Cochran County operated by Hilcorp Energy Company, completed August 4, 2009 and listed as shut in on the RRC schedule, shut in March 1, 2023.
The RRC has issued one drilling permit, issued February 17, 2004, permitted to 5,135 ft.
It was permitted by Apache Corporation and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 6 formation tops, including Rustler, Yates, Queen, Grayburg.
Its lease has reported 5.35M barrels of oil and 3.74M mcf of gas since January 1993, last reporting volume in April 2026. The lease carries 236 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Apache Corporation; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Mar 27, 2026
- Permits on file
- 3,458
- Phone
- (713) 209-2400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Hilcorp Energy Company |
| Production reports | Hilcorp Energy Companythrough Apr 2026 |
| Latest permit | Apache CorporationFeb 17, 2004 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,135
- total depth, ft
- 1
- permits on file
- Feb 17, 2004
- last permit issued
- Aug 4, 2009
- completed
- 5.35M
- cumulative oil, bbl
- 3.74M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 4, 2009
- Shut in
- Mar 1, 2023
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
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 236 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Dean, C. S. "A" O-11-6035 | Slaughter | Hilcorp Energy Company | 236 | 5.35M | 3.74M | Jan 1993 – Apr 2026 |
Oil, barrels lease total
Last 12 months 35,590 · prior 12 30,886(+15%)
Gas, mcf lease total
Last 12 months 29,335 · prior 12 23,798(+23%)
Wells named Dean C. S. A
Hilcorp Energy Company's other wells filed under this lease name in Cochran County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Texaco E & P Inc.Jan 1993 → Feb 1995
- 2Apache CorporationMar 1995 → Nov 2024
- 3Hilcorp Energy CompanyDec 2024 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 542087-99 | Drill | Apache Corporation | Feb 17, 2004 | Feb 17, 2004 | May 2, 2004 | 5,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 4, 2009 | Dean C. S. A O-11-6035 | Slaughter | Hilcorp Energy Company | Shut In · shut in Mar 1, 2023 | 5,135 |
Formation tops
As filed on W-2/G-1. Subsea from 3,771 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Rustler | 2,268 | 1,503 |
| Yates | 2,910 | 861 |
| Queen | 3,646 | 125 |
| Grayburg | 3,961 | -190 |
| San Andres | 4,226 | -455 |
| SA P-1ZONE | 4,951 | -1,180 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,780 | 4,825 | Perforated |
| 4,956 | 5,081 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 2,314 | 12.25 | 870 S |
| 8.625 | 2,317 | 12.25 | 870 S |
| 5.5 | 5,135 | 7.875 | 1,230 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 | Nov 20, 2009 | Aug 28, 2009 | — |
| 00 | Oct 27, 2004 | Jul 15, 2004 | Yes |
| 00 | Sep 20, 2004 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Oct 26, 2007. Cased hole, Gamma ray, Neutron. 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 |
|---|---|---|---|---|
| Neutron PorosityGAMMA RAY CCL COMP. NEUTRONSpans Grayburg, San Andres, Sa P-1zone | TIFF | 4,085 to 5,085 | Oct 26, 2007run May 18, 2004 | — |
"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 42-079-33065 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-079-33065 → 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/07933065, documented in the API reference.