TEXAS · WELLS · MIDLAND COUNTY · WILLIS 40A LEASE · API 42-329-41602 · DISTRICT 7B
Willis 40A #4
Midland County · Spraberry (Trend Area) field · Producing · Vertical
Willis 40a #4 (API 42-329-41602) is a well in Midland County operated by Oxyrock Operating LLC, completed November 13, 2017 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued March 20, 2017, permitted to 11,597 ft.
It was permitted by Crownquest Operating, LLC and has since transferred to Oxyrock Operating LLC on the wellbore schedule.
Completion filings report 9 formation tops, including Yates, Grayburg, San Andres, Glorieta.
Its lease has reported 85.7K barrels of oil and 366K mcf of gas since November 2017, last reporting volume in April 2026.
Operator of record
Permitted by Crownquest Operating, LLC; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Apr 22, 2026
- Permits on file
- 392
- Phone
- (713) 215-7000
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Oxyrock Operating LLC |
| Production reports | Oxyrock Operating, LLCthrough Apr 2026 |
| Latest permit | Crownquest Operating, LLCMar 20, 2017 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,597
- total depth, ft
- 1
- permits on file
- Mar 20, 2017
- last permit issued
- Nov 13, 2017
- completed
- 85.7K
- cumulative oil, bbl
- 366K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 2017 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 13, 2017
- Shut in
- —
- 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.
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 |
|---|---|---|---|---|---|---|
| Willis 40A O-10-50085 | Spraberry (Trend Area) | Oxyrock Operating, LLC | 1 | 85.7K | 366K | Nov 2017 – Apr 2026 |
Oil, barrels lease total
Last 12 months 6,126 · prior 12 7,200(-15%)
Gas, mcf lease total
Last 12 months 18,987 · prior 12 22,921(-17%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Crownquest Operating, LLCNov 2017 → Jul 2024
- 2Oxyrock Operating, LLCAug 2024 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 824313-99 | Drill | Crownquest Operating, LLC | Mar 9, 2017 | Mar 20, 2017 | Jun 29, 2017 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 13, 2017 | Willis 40A O-10-50085 | Spraberry (Trend Area) | Oxyrock Operating LLC | Producing | 11,597 |
Formation tops
As filed on W-2/G-1. Subsea from 2,681 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Yates | 2,500 | 181 |
| Grayburg | 4,193 | -1,512 |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | 4,716 | -2,035 |
| Glorieta | 5,508 | -2,827 |
| Clear ForkCLEARFORK | 6,503 | -3,822 |
| Spraberry | 7,345 | -4,664 |
| SpraberrySPRABERRY UPPER-DEAN | 8,715 | -6,034 |
| Queen | — | — |
| Santa Rosa | — | — |
| Seven Rivers | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,982 | 11,538 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 363 | 17.5 | 350 S |
| 8.625 | 5,597 | 11 | 1,225 S |
| 5.5 | 11,597 | 7.875 | 1,675 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 | Jul 13, 2018 | Jun 19, 2018 | Yes |
Well logs
1 log loaded from the RRC's log index, 1 of it with a digital LAS file, the latest received Jul 7, 2020. 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 |
|---|---|---|---|---|
| NeutronSpans Yates, Grayburg, San Andres, Glorieta, Clear Fork, Spraberry | LAS + TIFF | 0 to 11,543 | Jul 7, 2020 | 3.19 + 17.3 |
"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 42-329-41602 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-41602 → 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/32941602, documented in the API reference.