WELL · 42-501-31571 · DISTRICT 8
Denver Unit #4435
Yoakum County · Wasson field · Vertical
Denver Unit #4435 (API 42-501-31571) is a well in Yoakum County operated by Occidental Permian Ltd., completed March 15, 1990.
The RRC has issued one drilling permit, issued April 4, 1978, permitted to 5,250 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 lease has reported 352M barrels of oil and 1.17B mcf of gas since January 1993, last reporting in July 2026. The lease carries 2,471 wells, so these are lease totals, not this well alone.
It holds an active disposal or injection permit, with 319K barrels injected in the 12 months reported through September 2025.
Operator of record
Permitted by Shell Oil Company; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Dec 4, 2025 · 6,251 permits on file · (713) 215-7000
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Occidental Permian Ltd. |
| Production reports | Occidental Permian Ltd.through Apr 2026 |
| Latest permit | Shell Oil CompanyApr 4, 1978 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,250
- total depth, ft
- 1
- permits on file
- Apr 4, 1978
- last permit issued
- Mar 15, 1990
- completed
- 352M
- cumulative oil, bbl
- 1.17B
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Mar 15, 1990
- Shut in
- —
- Plugged
- —
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 2,471 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 | 352M | 1.17B | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 6,889,269 · prior 12 7,061,574(-2%)
Gas, mcf lease total
Last 12 months 9,464,854 · prior 12 11,150,167(-15%)
Chain 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 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 21368-99 | Drill | Shell Oil Company | Apr 4, 1978 | Apr 4, 1978 | — | 5,250 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-11-18910 | — | — | — | — |
| — | — O-11-18910 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 3,596 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| San Andres | 4,280 | -684 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,944 | 5,107 | Perforated |
| 4,944 | 5,275 | Perforated |
| 5,175 | 5,275 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 148 | 17.5 | 150 S |
| 9.625 | 1,006 | 12.25 | 350 S |
| 7 | 5,330 | — | 1,300 S |
| 7 | 5,330 | 8.75 | 1,330 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. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Jun 5, 2025 | May 11, 2025 | — |
| 00 | Sep 24, 1991 | Sep 6, 1991 | — |
| 00 | May 9, 1991 | Apr 1, 1991 | — |
| 00 | Apr 23, 1991 | Apr 23, 1990 | — |
| 00 | May 16, 1990 | Apr 23, 1990 | — |
| 00 | May 3, 1990 | Aug 16, 1978 | — |
| 00 | Jan 12, 1984 | Aug 16, 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 42-501-31571 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-501-31571 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.
Beyond the permit record
RRC UIC permits · H-10 reported volumes
Injection
- 319K
- bbl, last 12 reported months
- 5.39M
- bbl, all reported
- Sep 2025
- reported through
| UIC | Kind | Status | Permitted bbl/d | Max psi | Zone ft |
|---|---|---|---|---|---|
| 000072104 | H-1 Injection | Active | 5,500 | 2,300 | 4,600–5,400 |
MONTHLY INJECTED, BBL · H-10 · LAST 24 REPORTED MONTHS
Last 12 months 318,621 · prior 12 173,130(+84%)
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/50131571, documented in the API reference.