42-461-32010

Final Completion

MOBIL-TXL

UPTON County · District 7 · COX JOHN L. · PEGASUS S. (BEND)

Permits

Max Depth

11,000 ft

First Permit

1983-03-31

Latest Activity

1984-09-19

Lifespan

1 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1983-05-04

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: COX JOHN L. ≠ Production: PIONEER NATURAL RES. USA, INC. (reported 2026-04)

Resolved via: production → PIONEER NATURAL RES. USA, INC.

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

COX, JOHN L. 1993-2003→ JM COX RESOURCES, L.P. 2003-2018→ DE3 OPERATING LLC 2018-2021→ PIONEER NATURAL RES. USA, INC. 2021-2026

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 2,841 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
CRETACEOUS	350 ft	+2,491 ft
UPPER SPRABERRY (Spraberry)	7,720 ft	-4,879 ft
LOWER SPRABERRY (Spraberry)	8,400 ft	-5,559 ft
DEAN	8,870 ft	-6,029 ft
STRAWN	10,176 ft	-7,335 ft
BEND	10,487 ft	-7,646 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 (4)

Interval	Type
7,722–7,948 ft	Perforated
8,400–8,676 ft	Perforated
8,895–9,280 ft	Perforated
10,526–10,602 ft	Perforated

Casing (4)

Size	Set Depth	Cement
13.375"	415 ft	400 sx
8.625"	4,905 ft	1,000 sx
2.375"	10,060 ft	—
4.5"	10,670 ft	1,400 sx

Permit History (2)

#251890 Recompletion Final Completion

MOBIL-TXL · 9,350 ft

1984-09-19

#190056 Drill Final Completion

MOBIL-T.X.L · 11,000 ft

1983-03-31

Spud 1983-04-08

Applications (2)

#251890 A COX, JOHN L.

received 1984-09-13

#190056 A COX, JOHN L.

received 1983-03-31

Records & Logs

3 completion filings on record.

W-2/G-1 1984-11-12

W-2/G-1 1984-11-17

W-2/G-1 1983-05-10

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: 1
Max Depth: 11,000 ft
Drill Type: Vertical
County: UPTON
District: 7
Operator: COX JOHN L.
Completed: 1983-05-04

Operator

Name: COX, JOHN L
Location: MIDLAND
P-5 Status: Inactive (filed 2003-03-21)
Cum Oil (all leases): 15,795,687 bbl
Cum Gas (all leases): 2,577,420 mcf
Total Permits: 1,123