WELL · 42-427-33384 · DISTRICT 4
Walker Billy L. #4
Starr County · Arroyo Los Olmos (Yegua 25) field · Producing · Directional
Walker Billy L. #4 (API 42-427-33384) is a well in Starr County operated by Mortimer Production Company, completed August 2, 2001 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued June 22, 2001, permitted to 6,000 ft.
It was permitted by Mortimer Exploration Company and has since transferred to Mortimer Production Company on the wellbore schedule.
Completion filings report one formation top, including Yegua.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Mortimer Exploration Company; the EWA schedule now lists a different operator.
San Antonio, TX · P-5 Active, filed Sep 12, 2025 · 53 permits on file · (210) 821-6168
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Mortimer Production Company |
| Production reports | Mortimer Production Companythrough Apr 2026 |
| Latest permit | Mortimer Exploration CompanyJun 22, 2001 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 6,000
- total depth, ft
- 1
- permits on file
- Jun 22, 2001
- last permit issued
- Aug 2, 2001
- completed
- 0
- cumulative oil, bbl
- 2.1M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2001 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 2, 2001
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
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 |
|---|---|---|---|---|---|---|
| Walker, Billy L. G-4-185319 | Arroyo Los Olmos (Yegua 25) | Mortimer Production Company | 1 | 0 | 2.1M | Aug 2001 – Jul 2026 |
Gas, mcf lease total
Last 12 months 27,999 · prior 12 30,389(-8%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Mortimer Exploration CompanySep 2001 → Sep 2003
- 2Mortimer Production CompanyOct 2003 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 510614-99 | Drill | Mortimer Exploration Company | Jun 22, 2001 | Jun 22, 2001 | Jul 15, 2001 | 6,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-4-185319 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 225 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,526 | 5,531 | Perforated |
| 5,543 | 5,552 | Perforated |
| 5,574 | 5,612 | Perforated |
| 5,634 | 5,637 | Perforated |
| 5,688 | 5,697 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 503 | 12.25 | 220 S |
| 7 | 4,648 | 8.75 | 420 S |
| 4.5 | 6,245 | 6.5 | 380 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 | Nov 21, 2001 | Sep 21, 2001 | Yes |
| 00 | Nov 8, 2001 | — | — |
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 42-427-33384 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-427-33384 → 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.
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/42733384, documented in the API reference.