← Wells

42-137-30952

PRODUCING

MAYFIELD RANCH K

EDWARDS County · District 7 · UPP OPERATING LLC · M. M. W. (CANYON)

Permits

1

Max Depth

3,900 ft

First Permit

1987-02-26

Latest Activity

1987-02-26

Lifespan

< 1 yr

Regulatory Status

Schedule

ON SCHEDULE

Completion

1987-07-13

Shut-In

—

Plugged

—

P-5 Org Status: Active

!

EWA / Permit operator mismatch

Scheduling: UPP OPERATING LLC ≠ Permit: SONORA SOUTHWEST PARTNERSHIP

Resolved via: production → UPP OPERATING, LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

GRAHAM ROYALTY, LTD. 1993-1993→ DREYFUS, LOUIS NATURAL GAS CORP 1993-2001→ DOMINION OKLAHOMA TEXAS E&P, INC 2001-2007→ HIGHMOUNT EXPL & PROD TEXAS LLC 2008-2014→ ENERVEST OPERATING, L.L.C. 2014-2019→ UPP OPERATING, LLC 2019-2026

Lease Production

Production is reported at the lease level. View production data, decline curves, and history on the lease page.

Gas
production & DCA →

Formation Tops (4) Elevation 2,311 ft (GR)

CSV
FormationTop Depth (MD)Subsea (+above / −below SL)
TOP CANYON SD SEC (Canyon)2,900 ft-589 ft
TOP UPPER MAYFIELD SD3,022 ft-711 ft
TOP LOWER MAYFIELD SD3,200 ft-889 ft
BASE LOWER MAYFIELD SD3,426 ft-1,115 ft

As reported by operators on W-2/G-1 completion filings (RRC wellbore records). Depths are measured depth; names appear as filed. Subsea = reported elevation − measured depth (negative = below sea level; vertical wellbores only). View filings & logs at RRC ↗

Perforations (1)

IntervalType
3,173–3,299 ftPerforated

Casing (2)

SizeSet DepthCement
8.625"1,320 ft495 sx
4.5"3,748 ft260 sx

Permit History (1)

#326952 Drill Final Completion

MAYFIELD RANCH "K" · 3,900 ft

1987-02-26

Applications (1)

#326952 A SONORA SOUTHWEST PARTNERSHIP
received 1987-02-23

Records & Logs

2 completion filings on record · 1 with log images at RRC.

W-2/G-1 1987-07-31 log on file
W-2/G-1 1987-08-05
Completion packets + logs ↗ Wellbore filings ↗

Completion packets open directly (post-2011 filings include attached logs). Log images can't be deep-linked — clicking copies the API for you to paste.

No GPS coordinates yet

Coordinates come from the RRC GIS backfill and usually appear within days of permit issuance. Located in EDWARDS County.

Well Details

Well Number
128
Max Depth
3,900 ft
Drill Type
Vertical
County
EDWARDS
District
7
Operator
UPP OPERATING LLC
Completed
1987-07-13

Operator

Location
HOUSTON
P-5 Status
Active (filed 2026-03-06)
Cum Oil (all leases)
293,241 bbl
Cum Gas (all leases)
486,804,996 mcf
Activities
CSGD/G, CSGD/P, G/PUR, GTHS/G, OPRS/G, OPRS/O
Total Permits
33