WELL · 42-137-30946 · DISTRICT 7
Mayfield Ranch J #127
Edwards County · M. M. W. (Canyon) field · Producing · Vertical
Mayfield Ranch J #127 (API 42-137-30946) is a well in Edwards County operated by Upp Operating LLC, completed August 20, 1986 and listed as producing on the RRC schedule, shut in June 1, 2022.
The RRC has issued one drilling permit, issued July 31, 1986, permitted to 4,410 ft.
It was permitted by Sonora Southwest Partnership and has since transferred to Upp Operating LLC on the wellbore schedule.
Completion filings report 6 formation tops, including Base Cretaceous (marker), T. Mayfield (Canyon) Sand, T. Mayfield (Canyon) Sd, B. Mayfield (Canyon) Sand.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Sonora Southwest Partnership; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Mar 6, 2026
- Permits on file
- 33
- Phone
- (713) 495-5300
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Upp Operating LLC |
| Production reports | Upp Operating, LLCthrough May 2022 |
| Latest permit | Sonora Southwest PartnershipJul 31, 1986 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 4,410
- total depth, ft
- 1
- permits on file
- Jul 31, 1986
- last permit issued
- Aug 20, 1986
- completed
- 0
- cumulative oil, bbl
- 1.26M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 20, 1986
- Shut in
- Jun 1, 2022
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 |
|---|---|---|---|---|---|---|
| Mayfield Ranch "J" G-9-122235 | M. M. W. (Canyon) | Upp Operating, LLC | 1 | 0 | 1.26M | Jan 1993 – Jul 2026 |
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.
- 1Graham Royalty, Ltd.Jan 1993 → Oct 1993
- 2Dreyfus, Louis Natural Gas CorpNov 1993 → Nov 2001
- 3Dominion Oklahoma Texas E&P, IncDec 2001 → Dec 2007
- 4Highmount Expl & Prod Texas LLCJan 2008 → Sep 2014
- 5Enervest Operating, L.L.C.Dec 2014 → May 2018
- 6Upp Operating, LLCAug 2019 → May 2022
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 304795-99 | Drill | Sonora Southwest Partnership | Jul 31, 1986 | Jul 31, 1986 | — | 4,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 20, 1986 | Mayfield Ranch J G-9-122235 | M. M. W. (Canyon) | Upp Operating LLC | Producing · shut in Jun 1, 2022 | 4,410 |
Formation tops
As filed on W-2/G-1. Subsea from 2,228 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 860 | 1,368 |
| T. Mayfield (Canyon) Sand | 2,753 | -525 |
| T. Mayfield (Canyon) SD | 2,753 | -525 |
| B. Mayfield (Canyon) Sand | 3,172 | -944 |
| B. Mayfield (Canyon) SD | 3,172 | -944 |
| CanyonCANYON STRAY SD | 4,122 | -1,894 |
| CanyonTOP CANYON STRAY SAND | 4,122 | -1,894 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 2,943 | 3,041 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,311 | 12.25 | 440 S |
| 4.5 | 4,351 | 7.875 | 560 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 | Jan 12, 1987 | Dec 19, 1986 | Yes |
| 00 | Oct 13, 1986 | Oct 2, 1986 | Yes |
| 00 | Oct 9, 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 42-137-30946 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-137-30946 → 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/13730946, documented in the API reference.