42-409-01560

Final Completion

WELDER E. H. -C-

SAN PATRICIO County · District 4 · MARATHON OIL COMPANY · PLYMOUTH (6000 -B- SAND)

Permits

Max Depth

6,150 ft

First Permit

1977-12-21

Latest Activity

1979-02-23

Lifespan

1 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

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. 2003-2008→ 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.

Formation Tops (9) Elevation 42 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
MIOCENE (Miocene (undifferentiated))	1 ft	+41 ft
ANAHUAC	4,450 ft	-4,408 ft
FRIO	5,100 ft	-5,058 ft
5400'	5,391 ft	-5,349 ft
PLYMOUNTH	5,574 ft	-5,532 ft
MAG 5800	5,841 ft	-5,799 ft
6000'B	6,045 ft	-6,003 ft
6000 C	6,088 ft	-6,046 ft
6100'	6,128 ft	-6,086 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 (6)

Interval	Type
5,574–5,578 ft	Perforated
5,586–5,592 ft	Perforated
5,592–5,598 ft	Perforated
5,806–5,810 ft	Perforated
5,845–5,855 ft	Perforated
?–5,610 ft	Perforated

Casing (6)

Size	Set Depth	Cement
10.75"	1,215 ft	700 sx
10.75"	1,215 ft	700 sx
2.375"	5,739 ft	—
5.5"	6,150 ft	500 sx
5.5"	6,150 ft	500 sx
5.5"	6,150 ft	500 sx

Permit History (2)

#43483 Recompletion Final Completion

WELDER, E. H. "C" · 6,150 ft

1979-02-23

#14449 Recompletion U

WELDER, E. H. "C" · 6,150 ft

1977-12-21

Spud 1978-02-24

Applications (2)

#43483 A MARATHON OIL COMPANY

received 1979-02-23

#14449 A MARATHON OIL COMPANY

received 1977-12-21

Records & Logs

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

W-2/G-1 2008-10-10

W-2/G-1 2009-01-12

W-2/G-1 1987-05-20

W-2/G-1 1986-01-07 log on file

W-2/G-1 1979-02-23

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

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: 144
Max Depth: 6,150 ft
Drill Type: Vertical
County: SAN PATRICIO
District: 4
Operator: MARATHON OIL COMPANY

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