← Wells

42-055-32050

U

COSEY-DORN -A-

CALDWELL County · District 1 · MILLENNIUM EXPLORATION CO. LLC · LULING-BRANYON

Permits

1

Max Depth

2,100 ft

First Permit

1981-04-07

Latest Activity

1981-04-07

Lifespan

< 1 yr

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

2019-06-04

!

EWA / Permit operator mismatch

Scheduling: MILLENNIUM EXPLORATION CO. LLC ≠ Permit: MARGO DRILLING COMPANY

Resolved via: scheduling → MILLENNIUM EXPLORATION CO. LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

ENERGYPRO, INC. 1993-2001→ SOTOL ENERGY, INC. 2001-2025→ MILLENNIUM EXPLORATION CO. LLC 2025-2026

Lease Production

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

Oil
production & DCA →

Formation Tops (6) Elevation 431 ft (GL)

CSV
FormationTop Depth (MD)Subsea (+above / −below SL)
AUSTIN (Austin Chalk)1,722 ft-1,291 ft
EAGLEFORD (Eagle Ford)1,936 ft-1,505 ft
BUDA 1,965 ft-1,534 ft
DEL RIO 2,030 ft-1,599 ft
GEORGETOWN 2,075 ft-1,644 ft
EDWARDS 2,095 ft-1,664 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
2,088–2,105 ftOpen hole

Casing (1)

SizeSet DepthCement
4.5"2,088 ft410 sx

Permit History (1)

#114059 Drill U

COSEY-DORN "A" · 2,100 ft

1981-04-07

Applications (1)

#114059 A MARGO DRILLING COMPANY
received 1981-04-07

Records & Logs

2 completion filings on record.

W-2/G-1 1990-07-11
W-2/G-1 1990-07-31
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 CALDWELL County.

Well Details

Well Number
11
Max Depth
2,100 ft
Drill Type
Vertical
County
CALDWELL
District
1
Operator
MILLENNIUM EXPLORATION CO. LLC

Operator

Location
SAN ANTONIO
P-5 Status
Active (filed 2025-12-04)
Cum Oil (all leases)
352,075 bbl
Cum Gas (all leases)
783,959 mcf
Activities
OPRS/G, OPRS/O
Total Permits
41