42-317-34169

Final Completion

NAIL 36

MARTIN County · District 8 · ENDEAVOR ENERGY RESOURCES L.P. · MIDWEST (SPRABERRY-DEAN)

Permits

Max Depth

11,000 ft

First Permit

1998-02-17

Latest Activity

2015-09-23

Lifespan

18 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1998-07-27

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: ENDEAVOR ENERGY RESOURCES L.P. ≠ Production: DIAMONDBACK E&P LLC (reported 2026-04)

Resolved via: production → DIAMONDBACK E&P LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1998-02

Last Production

2026-07

Operator History

Chain of Custody

STEPHENS, AUTRY C. 1999-2000→ ENDEAVOR ENERGY RESOURCES L.P. 2000-2024→ DIAMONDBACK E&P LLC 2025-2026

Lease Production

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

Formation Tops (4) Elevation 2,847 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
UPPER SPRABERERY	7,812 ft	-4,965 ft
UPPER SPRABERRY (Spraberry)	7,812 ft	-4,965 ft
LOWER SPRABERRY (Spraberry)	8,490 ft	-5,643 ft
DEAN	8,825 ft	-5,978 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)

Interval	Type
7,812–9,782 ft	Perforated

Casing (3)

Size	Set Depth	Cement
12.75"	338 ft	410 sx
8.625"	5,150 ft	475 sx
4.5"	10,800 ft	1,200 sx

Permit History (2)

#810456 Field Transfer Final Completion

NAIL '36' · 10,800 ft

2015-09-23

Spud 1998-03-13

#473361 Drill Final Completion

NAIL "36" · 11,000 ft

1998-02-17

Spud 1998-03-13

Applications (2)

#810456 A ENDEAVOR ENERGY RESOURCES L.P.

received 2015-09-17

#473361 A STEPHENS, AUTRY C.

received 1998-02-13

Records & Logs

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

W-2/G-1 2015-10-10

W-2/G-1 1999-03-12 log on file

W-2/G-1 1999-04-15

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 MARTIN County.

Well Details

Well Number: 1
Max Depth: 11,000 ft
Drill Type: Vertical
County: MARTIN
District: 8
Operator: ENDEAVOR ENERGY RESOURCES L.P.
Completed: 1998-07-27

Operator

Name: ENDEAVOR ENGY RES L.P
Location: MIDLAND
P-5 Status: Active (filed 2026-06-12)
Cum Oil (all leases): 507,205,629 bbl
Cum Gas (all leases): 70,424,421 mcf
Total Permits: 6,190