42-391-02025

Final Completion

TOM OCONNOR (5800 SD) FLD. UNIT

REFUGIO County · District 2 · HILCORP ENERGY COMPANY · TOM OCONNOR (5800)

Permits

Max Depth

5,912 ft

First Permit

1979-03-12

Latest Activity

1979-03-12

Lifespan

< 1 yr

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

1989-12-29

EWA / Permit operator mismatch

Scheduling: HILCORP ENERGY COMPANY ≠ Permit: QUINTANA PET. CORP.

Resolved via: scheduling → HILCORP ENERGY COMPANY

Injection / Disposal

H-1 Injection Plugged 1990-01-23 UIC #000039085 permitted 1979-03-22

Permitted Volume

5,000 bbl/d

Max Pressure

1,000 psi

Injection Interval

1,815–1,856 ft

Injected (12mo)

—

Operator History

originally filed by QUINTANA PET. CORP. — asset transferred

Formation Tops (7) Elevation 51 ft

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
LARGARTO (Lagarto)	1,500 ft	-1,449 ft
OAKVILLE	2,750 ft	-2,699 ft
CATAHOULA (MIOCENE) (Catahoula)	3,300 ft	-3,249 ft
ANAHUAC (MIOCENE) (Anahuac)	4,100 ft	-4,049 ft
FRIO-GRETA (OLIGOCENE) (Frio)	4,365 ft	-4,314 ft
MIDDLE FRIO (SINTON) (Frio)	5,000 ft	-4,949 ft
LOWER FRIO (OLIGOCENE) (Frio)	5,880 ft	-5,829 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
1,815–1,821 ft	Perforated
1,815–1,956 ft	Perforated
1,824–1,836 ft	Perforated
1,839–1,856 ft	Perforated

Casing (3)

Size	Set Depth	Cement
9.625"	1,047 ft	350 sx
2.375"	1,853 ft	—
5"	5,923 ft	500 sx

Permit History (1)

#44043 Recompletion Final Completion

O'CONNOR, THOMAS "A" · 5,912 ft

1979-03-12

Applications (1)

#44043 A QUINTANA PET. CORP.

received 1979-03-12

Records & Logs

3 completion filings on record.

W-2/G-1 1989-01-27

W-2/G-1 1979-08-24

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 REFUGIO County.

Well Details

Well Number: 81D
Max Depth: 5,912 ft
Drill Type: Vertical
County: REFUGIO
District: 2
Operator: HILCORP ENERGY COMPANY

Operator

Name: HILCORP ENGY CO
Location: HOUSTON
P-5 Status: X (filed 2026-03-27)
Cum Oil (all leases): 75,699,281 bbl
Cum Gas (all leases): 1,779,939,645 mcf
Activities: CSGD/G, CSGD/P, G/PUR, GTHS/C, GTHS/G, GTHS/O, OPRS/G, OPRS/O
Total Permits: 3,430