WELL · 42-137-30952 · DISTRICT 7
Mayfield Ranch K #128
Edwards County · M. M. W. (Canyon) field · Producing · Vertical
Mayfield Ranch K #128 (API 42-137-30952) is a well in Edwards County operated by Upp Operating LLC, completed July 13, 1987 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued February 26, 1987, permitted to 3,800 ft.
It was permitted by Sonora Southwest Partnership and has since transferred to Upp Operating LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Canyon, Top Upper Mayfield Sd, Top Lower Mayfield Sd, Base Lower Mayfield Sd.
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 Apr 2026 |
| Latest permit | Sonora Southwest PartnershipFeb 26, 1987 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 3,800
- total depth, ft
- 1
- permits on file
- Feb 26, 1987
- last permit issued
- Jul 13, 1987
- completed
- 0
- cumulative oil, bbl
- 805K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 13, 1987
- Shut in
- —
- 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 "K" G-9-124725 | M. M. W. (Canyon) | Upp Operating, LLC | 1 | 0 | 805K | Jan 1993 – Jul 2026 |
Gas, mcf lease total
Last 12 months 10,738 · prior 12 9,435(+14%)
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.Oct 2014 → Mar 2019
- 6Upp Operating, LLCApr 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 326952-99 | Drill | Sonora Southwest Partnership | Feb 23, 1987 | Feb 26, 1987 | — | 3,900 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 13, 1987 | Mayfield Ranch K G-9-124725 | M. M. W. (Canyon) | Upp Operating LLC | Producing | 3,800 |
Formation tops
As filed on W-2/G-1. Subsea from 2,311 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| CanyonTOP CANYON SD SEC | 2,900 | -589 |
| Top Upper Mayfield SD | 3,022 | -711 |
| Top Lower Mayfield SD | 3,200 | -889 |
| Base Lower Mayfield SD | 3,426 | -1,115 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 3,173 | 3,299 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,320 | 12.25 | 495 S |
| 4.5 | 3,748 | 7.875 | 260 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 | Aug 7, 1987 | Jul 31, 1987 | Yes |
| 00 | Aug 5, 1987 | — | — |
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 42-137-30952 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-137-30952 → 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/13730952, documented in the API reference.