← Wells

42-013-34306

Final Completion Horizontal

HIERHOLZER UNIT

ATASCOSA County · District 1 · MARATHON OIL EF LLC

Permits

3

Max Depth

15,786 ft

First Permit

2010-05-25

Latest Activity

2012-05-17

Lifespan

2 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

—

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

2010-05

Last Production

2026-07

Operator History

Chain of Custody

HILCORP ENERGY COMPANY 2010-2010→ MARATHON OIL EF LLC 2010-2026

Lease Production

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

Oil
production & DCA →
Oil
production & DCA →

Formation Tops (5) Elevation 429 ft (GR)

CSV
FormationTop Depth (MD)Subsea (+above / −below SL)
ANACACHO 10,390 ft-9,961 ft
AUSTIN CHALK 10,527 ft-10,098 ft
AUSTIN CHALK 10,535 ft-10,106 ft
EAGLE FORD 10,692 ft-10,263 ft
EAGLE FORD 10,740 ft-10,311 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 (3)

IntervalType
10,610–10,808 ftOpen hole
10,610–15,474 ftOpen hole
14,729–15,634 ftPerforated

Casing (3)

SizeSet DepthCement
9.625"5,290 ft1,930 sx
5.5"9,927 ft1,660 sx
4.5"15,786 ft855 sx

Permit History (3)

#739574 Recompletion Final Completion

HIERHOLZER UNIT · 15,786 ft

2012-05-17

Spud 2010-05-27

#696455 Drill Y

HIERHOLZER UNIT · 13,500 ft

2010-05-25

Spud 2010-05-27

#696455 Drill

HIERHOLZER UNIT · 13,500 ft

2010-05-25

Spud 2010-05-27

Applications (3)

#739574 A MARATHON OIL EF LLC
received 2012-04-30
#696455 A HILCORP ENERGY COMPANY
received 2010-09-15
#696455 A HILCORP ENERGY COMPANY
received 2010-05-24

Records & Logs

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

W-2/G-1 2012-06-26
W-2/G-1 2011-05-23 log on file
W-2/G-1 2011-05-23 log on file
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 ATASCOSA County.

Well Details

Well Number
1H
Max Depth
15,786 ft
Drill Type
Horizontal
County
ATASCOSA
District
1
Operator
MARATHON OIL EF LLC

Operator

Location
HOUSTON
P-5 Status
Active (filed 2025-09-26)
Cum Oil (all leases)
409,189,156 bbl
Cum Gas (all leases)
1,029,735,602 mcf
Activities
CSGD/G, CSGD/P, G/PUR, GTHS/C, GTHS/G, GTHS/O, OPRS/G, OPRS/O
Total Permits
3,166