WELL · 42-371-35025 · DISTRICT 8
Koller #4
Pecos County · Lehn-Apco (1600) field · Vertical
Koller #4 (API 42-371-35025) is a well in Pecos County operated by N & O Oil CO., completed June 24, 1984.
The RRC has issued one drilling permit, issued June 15, 1984, permitted to 1,750 ft.
It was permitted by Haylan Oil Company and has since transferred to N & O Oil CO. on the wellbore schedule.
Completion filings report one formation top, including Queen.
Its lease has reported 19.1K barrels of oil and 324 mcf of gas since January 1993, last reporting in July 2026. The lease carries 4 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Haylan Oil Company; the EWA schedule now lists a different operator.
Imperial, TX · P-5 Y, filed Jan 5, 2026 · 3 permits on file · (432) 940-0073
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | N & O Oil Co. |
| Production reports | N & O Oil Co.through Apr 2026 |
| Latest permit | Haylan Oil CompanyJun 15, 1984 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 1,750
- total depth, ft
- 1
- permits on file
- Jun 15, 1984
- last permit issued
- Jun 24, 1984
- completed
- 19.1K
- cumulative oil, bbl
- 324
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 24, 1984
- 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 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Koller O-10-28482 | Lehn-Apco (1600) | N & O Oil Co. | 4 | 19.1K | 324 | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 53 · prior 12 297(-82%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Haylan Oil CompanyJan 1993 → Jan 2000
- 2Central Drilling Company, USAFeb 2000 → Nov 2005
- 3Orbit Crude, Inc.Dec 2005 → Sep 2017
- 4N & O Oil Co.Oct 2017 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 242213-99 | Drill | Haylan Oil Company | Jun 15, 1984 | Jun 15, 1984 | Jun 19, 1984 | 1,750 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-28482 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,433 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen | 1,634 | 799 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 1,634 | 1,709 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 607 | 12.25 | 400 S |
| 5.5 | 1,750 | 7.875 | 290 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 | Jul 24, 1986 | Jul 8, 1986 | — |
| 00 | Jul 22, 1986 | — | — |
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 42-371-35025 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-371-35025 → 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/37135025, documented in the API reference.