WELL · 42-041-31071 · DISTRICT 3
Cobb Unit 5 #1
Brazos County · Iola South (Sub-Clarksville) field · Vertical
Cobb Unit 5 #1 (API 42-041-31071) is a plugged well in Brazos County, plugged February 4, 2014, last operated by Chaparral Energy L.L.C..
The RRC has issued one drilling permit, issued December 19, 1983, permitted to 9,200 ft.
It was permitted by L & B Oil CO. Inc. and has since transferred to Chaparral Energy L.L.C. on the wellbore schedule.
Completion filings report 3 formation tops, including Austin Chalk, Sub-Clarksville, Woodbine.
Its lease has reported 19.6K barrels of oil and 46.9K mcf of gas since January 1993, last reporting in July 2014.
Operator of record
Permitted by L & B Oil Co. Inc.; the EWA schedule now lists a different operator.
Oklahoma City, OK · P-5 Y, filed Nov 4, 2025 · 443 permits on file · (866) 478-8770
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Chaparral Energy L.L.C. |
| Production reports | Chaparral Energy, L.L.C.through Mar 2006 |
| Latest permit | L & B Oil Co. Inc.Dec 19, 1983 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,200
- total depth, ft
- 1
- permits on file
- Dec 19, 1983
- last permit issued
- Jan 23, 1984
- completed
- 19.6K
- cumulative oil, bbl
- 46.9K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2014
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jan 23, 1984
- Shut in
- —
- Plugged
- Feb 4, 2014
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 |
|---|---|---|---|---|---|---|
| Cobb Unit 5 O-3-17232 | Iola, South (Sub-Clarksville) | Chaparral Energy, L.L.C. | 1 | 19.6K | 46.9K | Jan 1993 – Jul 2014 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Vintage Petroleum, Inc.Jan 1993 → Nov 2001
- 2Chaparral (USA) Energy, Inc.Feb 2002 → Sep 2002
- 3Chaparral Energy, L.L.C.Oct 2002 → Mar 2006
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 224488-99 | Drill | L & B Oil Co. Inc. | Dec 19, 1983 | Dec 19, 1983 | — | 9,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-3-17232 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 213 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Austin Chalk | 8,565 | -8,352 |
| Sub-Clarksville | 8,927 | -8,714 |
| Woodbine | 9,050 | -8,837 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,020 | 9,029 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 2,407 | 13.5 | 1,000 S |
| 5.5 | 9,220 | 8.75 | 390 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 | Feb 14, 1984 | Jan 26, 1984 | — |
| 00 | Feb 2, 1984 | Jan 26, 1984 | — |
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 42-041-31071 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-041-31071 → 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/04131071, documented in the API reference.