WELL · 42-371-32453 · DISTRICT 8
Chalkley #4
Pecos County · Lehn-Apco South (Ellen) field · Vertical
Chalkley #4 (API 42-371-32453) is a well in Pecos County operated by Olsen Energy Inc., completed February 3, 1978.
The RRC has issued 2 drilling permits between 1977 and 1991, permitted to 4,850 ft.
It was permitted by Pedco Resources Company and has since transferred to Olsen Energy Inc. on the wellbore schedule.
Completion filings report 4 formation tops, including Queens, San Andres, Wichita-Albany, Ellenburger.
Its 2 leases have reported 69.1K barrels of oil and 241K mcf of gas since January 1993, last reporting in July 2026. The leases carry 6 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Pedco Resources Company; the EWA schedule now lists a different operator.
Boerne, TX · P-5 Y, filed May 4, 2026 · 243 permits on file · (210) 834-4655
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Olsen Energy Inc. |
| Production reports | Olsen Energy Inc.through Apr 2026 |
| Latest permit | Pedco Resources CompanyJun 7, 1991 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 4,850
- total depth, ft
- 2
- permits on file
- Jun 7, 1991
- last permit issued
- Feb 3, 1978
- completed
- 69.1K
- cumulative oil, bbl
- 241K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 3, 1978
- 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 2 leases this well is completed on; they carry 6 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Chalkley O-10-24399 | Lehn-Apco, South (Ellen) | Olsen Energy Inc. | 5 | 37K | 2.14K | Jan 1993 – Jul 2026 |
| Chalkley O-10-33238 | Lehn-Apco, S. (Wichita-Albany) | Olsen Energy Inc. | 1 | 32.1K | 239K | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 4,686 · prior 12 5,737(-18%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Pedco Resources CompanyJan 1993 → Jan 1995
- 2MBR Resources, Inc.Feb 1995 → Mar 2006
- 3Unit Petroleum CompanyApr 2006 → Nov 2014
- 4Olsen Energy Inc.Dec 2016 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 386695-99 | Recompletion | Pedco Resources Company | Apr 12, 1991 | Jun 7, 1991 | Mar 21, 1991 | 4,850 |
| 15210-99 | Drill | Lovelady, I. W. | Dec 30, 1977 | Dec 30, 1977 | Jan 14, 1978 | 4,750 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-24399 | — | — | — | — |
| — | — O-10-33238 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,462 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queens | 1,640 | 822 |
| San Andres | 2,490 | -28 |
| Wichita-AlbanyWICHITA ALBANY | 4,540 | -2,078 |
| EllenburgerELLENBERGER | 4,790 | -2,328 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,560 | 4,570 | Perforated |
| — | 4,850 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 425 | 17.5 | 350 S |
| 5.5 | 4,789 | 7.875 | 560 S |
| 5.5 | 4,789 | 11 | 2,420 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 | Aug 27, 1991 | Apr 10, 1991 | Yes |
| 00 | Aug 13, 1991 | Feb 24, 1978 | — |
| 00 | Jan 12, 1984 | Feb 24, 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 42-371-32453 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-371-32453 → 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/37132453, documented in the API reference.