WELL · 42-127-32689 · DISTRICT 1
Tumlinson-Coffield Unit #1 #1
Dimmit County · Blakeway (Dixon Sand) field · Producing · Vertical
Tumlinson-Coffield Unit #1 #1 (API 42-127-32689) is a well in Dimmit County operated by Mcday Energy Corp., completed September 17, 1985 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 1, 1985, permitted to 4,900 ft.
It was permitted by Cabot Petroleum Corporation and has since transferred to Mcday Energy Corp. on the wellbore schedule.
Completion filings report 2 formation tops, including Escondido, Olmos.
Its lease has reported 15.9K barrels of oil and 38.5K mcf of gas since January 1993, last reporting in July 2026.
Operator of record
Permitted by Cabot Petroleum Corporation; the EWA schedule now lists a different operator.
Plano, TX · P-5 Y, filed Apr 4, 2026 · 52 permits on file · (214) 202-1064
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | McDay Energy Corp. |
| Production reports | McDay Energy Corp.through Apr 2026 |
| Latest permit | Cabot Petroleum CorporationAug 1, 1985 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 4,900
- total depth, ft
- 1
- permits on file
- Aug 1, 1985
- last permit issued
- Sep 17, 1985
- completed
- 15.9K
- cumulative oil, bbl
- 38.5K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Sep 17, 1985
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
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 |
|---|---|---|---|---|---|---|
| Tumlinson-Coffield Unit #1 O-1-10606 | Blakeway (Dixon Sand) | McDay Energy Corp. | 1 | 15.9K | 38.5K | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 42 · prior 12 186(-77%)
Gas, mcf lease total
Last 12 months 138 · prior 12 0
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Energy Development Corp.Jan 1993 → Jan 1993
- 2Catarina Petroleum L. C.Feb 1993 → Jul 1998
- 3Heartland Resources, Inc.Aug 1998 → Feb 1999
- 4Carrizo Exploration, Inc.Mar 1999 → May 2006
- 5TDW Exploration, LLCJun 2006 → Mar 2008
- 6Anaconda Oil & GasJan 2010 → Jul 2010
- 7Texowa, LLCApr 2013 → Jul 2014
- 8McDay Energy Corp.Oct 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 281766-99 | Drill | Cabot Petroleum Corporation | Aug 1, 1985 | Aug 1, 1985 | Aug 28, 1985 | 4,900 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-10606 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 564 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,460 | 4,491 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 545 | 12.25 | 350 S |
| 5.5 | 4,800 | 7.875 | 1,320 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 | Oct 17, 1985 | Oct 9, 1985 | Yes |
| 00 | Oct 15, 1985 | — | — |
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 42-127-32689 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-127-32689 → 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/12732689, documented in the API reference.