TEXAS · WELLS · YOAKUM COUNTY · API 42-501-31508 · DISTRICT 7B
Denver Unit #4431
Yoakum County · Wasson field · Vertical
Denver Unit #4431 (API 42-501-31508) is a plugged well in Yoakum County, plugged August 3, 2007, last operated by Occidental Permian Ltd..
The RRC has issued one drilling permit, issued November 21, 1977, permitted to 5,360 ft.
It was permitted by Shell Oil Company and has since transferred to Occidental Permian Ltd. on the wellbore schedule.
Completion filings report one formation top, including San Andres.
Its 2 leases have reported 354M barrels of oil and 1.17B mcf of gas since the record begins in January 1993, last reporting volume in August 2026. The leases carry 2,472 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Shell Oil Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Feb 2, 2026
- Permits on file
- 6,251
- Phone
- (713) 215-7000
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Occidental Permian Ltd. |
| Production reports | Occidental Permian Ltd.through Aug 2026 |
| Latest permit | Shell Oil CompanyNov 21, 1977 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,360
- total depth, ft
- 1
- permits on file
- Nov 21, 1977
- last permit issued
- Aug 9, 2005
- completed
- 354M
- cumulative oil, bbl
- 1.17B
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · ON RECORD FROM JAN 1993, THE RECORD'S FIRST MONTH, THROUGH AUG 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Aug 9, 2005
- Shut in
- —
- Plugged
- Aug 3, 2007
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 AUG 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 2,472 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Denver Unit O-11-18910 | Wasson | Occidental Permian Ltd. | 2,471 | 354M | 1.17B | by Jan 1993 – Aug 2026 |
| Denver Unit G-11-221348 | Wasson | Occidental Permian Ltd. | 1 | 0 | 0 | Aug 2005 – — |
Oil, barrels lease total
Last 12 months 6,697,193 · prior 12 7,027,275(-5%)
Gas, mcf lease total
Last 12 months 9,266,178 · prior 12 10,859,614(-15%)
Wells named Denver Unit
Occidental Permian Ltd.'s other wells filed under this lease name in Yoakum 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.
- 1Shell Western E&P Inc.Jan 1993 → Feb 1997
- 2Altura Energy Ltd.Mar 1997 → Apr 2000
- 3Occidental Permian Ltd.May 2000 → Aug 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 12967-99 | Drill | Shell Oil Company | Nov 21, 1977 | Nov 21, 1977 | Dec 5, 1977 | 5,360 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 9, 2005 | Denver Unit G-11-221348 | Wasson | Occidental Permian Ltd. | Plugged | — |
| — | Denver Unit O-11-18910 | Wasson | Occidental Permian Ltd. | Plugged | — |
Formation tops
As filed on W-2/G-1. Subsea from 3,592 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| San Andres | 4,285 | -693 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,676 | 4,714 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 410 | 12.25 | 250 S |
| 7 | 5,340 | 8.75 | 1,900 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 | Mar 13, 2007 | Oct 19, 2006 | — |
| 00 | Nov 14, 2006 | — | — |
| 00 | Jan 12, 1984 | Feb 14, 1978 | — |
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 42-501-31508 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-501-31508 → 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/50131508, documented in the API reference.