42-461-03918

MCELROY RANCH CO. 129

UPTON County · District 7 · EXXON MOBIL CORPORATION

Permits

Max Depth

12,158 ft

First Permit

1995-09-18

Latest Activity

2008-08-14

Lifespan

13 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

—

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

EXXON CORP. 1993-2000→ EXXON MOBIL CORPORATION 2000-2011→ XTO ENERGY INC. 2012-2022

Lease Production

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

Formation Tops (6) Elevation 2,809 ft (KB)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
RUSTLER	1,483 ft	+1,326 ft
SAN ANDRES	4,680 ft	-1,871 ft
WOLFCAMP	7,510 ft	-4,701 ft
DEVONIAN	10,303 ft	-7,494 ft
FUSSELMAN	11,191 ft	-8,382 ft
ELLENBURGER	11,995 ft	-9,186 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 (5)

Interval	Type
9,310–9,410 ft	Perforated
10,370–10,800 ft	Perforated
10,850–10,976 ft	Perforated
11,166–11,254 ft	Perforated
?–11,995 ft	Perforated

Casing (3)

Size	Set Depth	Cement
13.375"	605 ft	500 sx
9.625"	4,982 ft	2,770 sx
7"	12,018 ft	600 sx

Permit History (2)

#667828 Recompletion

MCELROY RANCH CO. 129 · 11,254 ft

2008-08-14

#439927 Recompletion Final Completion

MCELROY RANCH CO #129 · 12,158 ft

1995-09-18

Spud 1996-06-10

Applications (2)

#667828 A EXXON MOBIL CORPORATION

received 2008-07-29

#439927 A EXXON CORP.

received 1995-09-15

Records & Logs

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

W-2/G-1 2008-11-20

W-2/G-1 1997-02-19 log on file

W-2/G-1 1997-03-06

W-2/G-1 1984-01-12

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 UPTON County.

Well Details

Well Number: 23
Max Depth: 12,158 ft
Drill Type: Vertical
County: UPTON
District: 7
Operator: EXXON MOBIL CORPORATION

Operator

Name: EXXON MOBIL CORP
Location: SPRING
P-5 Status: Delinquent (filed 2025-04-16)
Cum Oil (all leases): 155,164,556 bbl
Cum Gas (all leases): 2,032,561,175 mcf
Activities: CSGD/G, CSGD/P, G/PUR, GTHS/C, GTHS/G
Total Permits: 1,223