42-409-31856

Final Completion

WELDER E. H. -C-

SAN PATRICIO County · District 4 · MARATHON OIL COMPANY · PLYMOUTH (6800)

Permits

Max Depth

7,212 ft

First Permit

1983-11-17

Latest Activity

1987-04-24

Lifespan

3 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1986-01-27

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: MARATHON OIL COMPANY ≠ Production: MCGOWAN WORKING PARTNERS, INC. (reported 2026-04)

Resolved via: production → MCGOWAN WORKING PARTNERS, INC.

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

MARATHON OIL COMPANY 1993-2003→ EOG RESOURCES, INC. 2003-2004→ MCGOWAN WORKING PARTNERS, INC. 2012-2026

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 (5) Elevation 43 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
MIOCENE AND YOUNGER (Miocene (undifferentiated))	4,450 ft	-4,407 ft
MIOCENE & YOUNGER (Miocene (undifferentiated))	4,450 ft	-4,407 ft
ANAHUAC	5,150 ft	-5,107 ft
FRIO	5,150 ft	-5,107 ft
FRIO	7,212 ft	-7,169 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 (8)

Interval	Type
1,526–1,527 ft	Perforated
1,533–1,535 ft	Perforated
1,544–1,545 ft	Perforated
5,613–5,616 ft	Perforated
5,636–5,640 ft	Perforated
6,058–6,064 ft	Perforated
6,084–6,089 ft	Perforated
6,818–6,824 ft	Perforated

Casing (2)

Size	Set Depth	Cement
9.625"	1,300 ft	470 sx
7"	7,053 ft	200 sx

Permit History (3)

#327889 Recompletion Final Completion

WELDER, E. H. "C" · 7,212 ft

1987-04-24

#289016 Recompletion U

WELDER, E. H. -C- · 7,212 ft

1985-10-31

#224458 Drill Final Completion

WELDER, E. H. "C" · 7,200 ft

1983-11-17

Spud 1983-12-15

Applications (3)

#327889 A MARATHON OIL COMPANY

received 1987-03-18

#289016 A MARATHON OIL COMPANY

received 1985-10-24

#224458 A MARATHON OIL COMPANY

received 1983-11-17

Records & Logs

9 completion filings on record · 2 with log images at RRC.

W-2/G-1 1996-01-22

W-2/G-1 1987-07-29

W-2/G-1 1987-06-15 log on file

W-2/G-1 1987-06-23

W-2/G-1 1986-02-14 log on file

W-2/G-1 1985-08-30

+3 more filings

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 SAN PATRICIO County.

Well Details

Well Number: 165
Max Depth: 7,212 ft
Drill Type: Vertical
County: SAN PATRICIO
District: 4
Operator: MARATHON OIL COMPANY
Completed: 1986-01-27

Operator

Name: MARATHON OIL CO
Location: HOUSTON
P-5 Status: Active (filed 2025-08-14)
Cum Oil (all leases): 183,150,113 bbl
Cum Gas (all leases): 1,013,063,895 mcf
Activities: CSGD/P, G/PUR
Total Permits: 3,707