WELL · 42-115-33135 · DISTRICT 8
West Spraberry Unit #603
Dawson County · Spraberry W. (Deep Spraberry) field · Producing · Vertical
West Spraberry Unit #603 (API 42-115-33135) is a well in Dawson County operated by JO Mill Oil Company LLC, completed May 31, 2005 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued April 14, 2005, permitted to 9,000 ft.
It was permitted by Chevron U. S. A. Inc. and has since transferred to JO Mill Oil Company LLC on the wellbore schedule.
Completion filings report 5 formation tops, including Rustler, Yates, San Andres, Clear Fork.
Its lease has reported 4.13M barrels of oil and 808K mcf of gas since December 1993, last reporting in July 2026. The lease carries 59 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Chevron U. S. A. Inc.; the EWA schedule now lists a different operator.
Fort Worth, TX · P-5 Y, filed May 4, 2026 · (682) 715-5794
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | JO Mill Oil Company LLC |
| Production reports | JO Mill Oil Company LLCthrough Apr 2026 |
| Latest permit | Chevron U. S. A. Inc.Apr 14, 2005 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,000
- total depth, ft
- 1
- permits on file
- Apr 14, 2005
- last permit issued
- May 31, 2005
- completed
- 4.13M
- cumulative oil, bbl
- 808K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 31, 2005
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: 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 59 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| West Spraberry Unit O-11-67167 | Spraberry, W. (Deep, Spraberry) | JO Mill Oil Company LLC | 59 | 4.13M | 808K | Dec 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 38,014 · prior 12 45,176(-16%)
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.
- 1Texaco E & P Inc.Dec 1993 → May 2002
- 2Chevron U. S. A. Inc.Jun 2002 → Sep 2020
- 3JO Mill Oil Company LLCOct 2020 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 560402-99 | Drill | Chevron U. S. A. Inc. | Apr 13, 2005 | Apr 14, 2005 | Apr 29, 2005 | 9,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-11-67167 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,916 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Rustler | 1,630 | 1,286 |
| Yates | 2,265 | 651 |
| San Andres | 3,560 | -644 |
| Clear ForkCLEARFORK | 6,545 | -3,629 |
| SpraberryUPPER SPRABERRY | 6,685 | -3,769 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,570 | 7,606 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 11.75 | 344 | 14.75 | 300 S |
| 8.625 | 4,665 | 11 | 1,400 S |
| 5.5 | 7,897 | 7.875 | 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. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Dec 12, 2005 | Jun 24, 2005 | Yes |
| 00 | Oct 6, 2005 | — | — |
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 42-115-33135 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-115-33135 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. then paste it into their search.
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/11533135, documented in the API reference.