42-135-35629

Final Completion

RATLIFF H

ECTOR County · District 8 · COG OPERATING LLC · HEADLEE N. (DEVONIAN)

Permits

Max Depth

14,000 ft

First Permit

1987-08-26

Latest Activity

1988-04-20

Lifespan

< 1 yr

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1988-05-09

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: COG OPERATING LLC ≠ Production: DIAMONDBACK E&P LLC (reported 2026-04)

EWA / Permit operator mismatch

Scheduling: COG OPERATING LLC ≠ Permit: SUN EXPL. & PROD. CO.-MIDLAND

Resolved via: production → DIAMONDBACK E&P LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

ANTELOPE PRODUCTION CO. 1993-1993→ AMOCO PRODUCTION COMPANY 1993-1997→ ALTURA ENERGY LTD. 1997-1998→ UNION PACIFIC RESOURCES COMPANY 1998-2001→ RME PETROLEUM COMPANY 2001-2002→ ANADARKO E&P COMPANY LP 2002-2004→ MERIT ENERGY COMPANY 2004-2010→ PDC-WV-CO CORPORATION 2010-2010→ PDC ENERGY 2010-2012→ COG OPERATING LLC 2012-2019→ TORCH OPERATING LLC 2019-2020→ FIREBIRD ENERGY LLC 2020-2022→ DIAMONDBACK E&P LLC 2022-2026

Lease Production

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

Formation Tops (7) Elevation 2,995 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
WICHITA ALBANY (Wichita-Albany)	7,815 ft	-4,820 ft
DEVONIAN	11,876 ft	-8,881 ft
UPPER DEVONIAN (Devonian)	12,150 ft	-9,155 ft
LOWER DEVONIAN (Devonian)	12,243 ft	-9,248 ft
FUSSELMAN	12,806 ft	-9,811 ft
SIMPSON	13,145 ft	-10,150 ft
ELLENBURGER	13,600 ft	-10,605 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 (2)

Interval	Type
7,820–7,894 ft	Perforated
12,082–12,211 ft	Perforated

Casing (3)

Size	Set Depth	Cement
13.375"	457 ft	500 sx
9.625"	6,000 ft	2,600 sx
5.5"	12,391 ft	1,625 sx

Permit History (3)

#345470 Recompletion Final Completion

RATLIFF, SALLIE W. · 13,720 ft

1988-04-20

#341665 Recompletion Final Completion

RATLIFF, SALLIE W. · 13,720 ft

1988-01-20

#335121 Drill Final Completion

RATLIFF, SALLIE W. · 14,000 ft

1987-08-26

Spud 1987-09-16

Applications (3)

#345470 A SUN EXPL. & PROD. CO.-MIDLAND

received 1988-04-20

#341665 A SUN EXPL. & PROD. CO.-MIDLAND

received 1988-01-20

#335121 A SUN EXPL. & PROD. CO.-MIDLAND

received 1987-08-26

Records & Logs

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

W-2/G-1 2013-10-14

W-2/G-1 1988-05-20

W-2/G-1 1988-01-29

W-2/G-1 1988-02-06

W-2/G-1 1988-01-04 log on file

W-2/G-1 1988-01-09

Completion packets + logs ↗ Wellbore filings ↗

Completion packets open directly (post-2011 filings include attached logs). Log images and the UL library 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 ECTOR County.

Well Details

Well Number: 1
Max Depth: 14,000 ft
Drill Type: Vertical
County: ECTOR
District: 8
Operator: COG OPERATING LLC
Completed: 1988-05-09

Operator

Name: COG OPER LLC
Location: MIDLAND
P-5 Status: X (filed 2026-06-02)
Cum Oil (all leases): 645,285,792 bbl
Cum Gas (all leases): 305,183,488 mcf
Activities: OPRS/G, OPRS/O
Total Permits: 4,550