42-137-30952

PRODUCING

MAYFIELD RANCH K

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

RRC Lookup

Permits

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: Delinquent

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

2026-03

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 2019-2025

Lease Production

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

Gas

production & DCA →

Permit History (1)

#326952 Drill Final Completion

MAYFIELD RANCH "K" · 3,900 ft

1987-02-26

Permit Applications (1)

#326952 A SONORA SOUTHWEST PARTNERSHIP

received 1987-02-23

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

Name: UPP OPER, LLC
Location: HOUSTON
P-5 Status: Y (filed 2025-12-04)
Cum Oil (all leases): 283,339 bbl
Cum Gas (all leases): 469,977,648 mcf
Activities: CSGD/G, CSGD/P, G/PUR, GTHS/G, OPRS/G, OPRS/O
Total Permits: 33

External Links

RRC Wellbore Query →