WELL · 42-055-31098 · DISTRICT 1
Cosey-Dorn Unit 1 #1
Caldwell County · Luling-Branyon (1700) field · Vertical
Cosey-Dorn Unit 1 #1 (API 42-055-31098) is a well in Caldwell County operated by Mott Oil & Gas Inc., completed November 18, 1977.
The RRC has issued one drilling permit, issued December 27, 1977, permitted to 2,000 ft.
Completion filings report 3 formation tops, including Austin Chalk, Eagle Ford, Buda.
Its 2 leases have reported 15K barrels of oil and 20 mcf of gas since January 1993, last reporting in July 2026. The leases carry 21 wells, so these are lease totals, not this well alone.
Operator of record
Sugar Land, TX · P-5 Y, filed May 7, 1994 · 17 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Mott Oil & Gas Inc. |
| Production reports | Millennium Exploration Co. LLCthrough Jan 2026 |
| Latest permit | Mott Oil & Gas, Inc.Dec 27, 1977 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 2,000
- total depth, ft
- 1
- permits on file
- Dec 27, 1977
- last permit issued
- Nov 18, 1977
- completed
- 15K
- cumulative oil, bbl
- 20
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Nov 18, 1977
- 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 21 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Cosey-Dorn -A- O-1-7057 | Luling-Branyon | Millennium Exploration Co. LLC | 21 | 15K | 20 | Jan 1993 – Jul 2026 |
| — O-1-6451 | — | — | 0 | 0 | 0 | — |
Oil, barrels lease total
Last 12 months 217 · prior 12 396(-45%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Energypro, Inc.Jan 1993 → Nov 2001
- 2Sotol Energy, Inc.Dec 2001 → Mar 2025
- 3Millennium Exploration Co. LLCApr 2025 → Jan 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 14735-99 | Drill | Mott Oil & Gas, Inc. | Dec 27, 1977 | Dec 27, 1977 | Nov 8, 1977 | 2,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-6451 | — | — | — | — |
| — | — O-1-7057 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 440 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Austin Chalk | 1,735 | -1,295 |
| Eagle Ford | 1,962 | -1,522 |
| Buda | 1,988 | -1,548 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 1,746 | 1,930 | Perforated |
| — | 1,930 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 5.5 | 2,066 | 7.875 | 320 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 | Jun 2, 1992 | May 4, 1992 | — |
| 00 | Jan 15, 1992 | Oct 8, 1980 | — |
| 00 | Jan 12, 1984 | Oct 8, 1980 | — |
| 00 | Jan 12, 1984 | Jan 11, 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 42-055-31098 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-055-31098 → 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/05531098, documented in the API reference.