42-287-31588

Unperfed Completion HorizontalSidetrack

ZIEHR LILLIAN UNIT

LEE County · District 3 · MAGNOLIA OIL & GAS OPERATING LLC · GIDDINGS (AUSTIN CHALK-3)

Permits

Max Depth

13,000 ft

First Permit

1984-06-11

Latest Activity

1999-08-27

Lifespan

15 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1984-10-31

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: MAGNOLIA OIL & GAS OPERATING LLC ≠ Production: UNION PACIFIC RESOURCES COMPANY (reported 1999-08)

EWA / Permit operator mismatch

Scheduling: MAGNOLIA OIL & GAS OPERATING LLC ≠ Permit: UNION PACIFIC RESOURCES COMPANY

Resolved via: scheduling → MAGNOLIA OIL & GAS OPERATING LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

originally filed by UNION PACIFIC RESOURCES COMPANY — asset transferred

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 (7) Elevation 391 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
NAVARRO	5,860 ft	-5,469 ft
NAVARRO #2 (Navarro)	6,380 ft	-5,989 ft
NAVARRO 2 (Navarro)	6,380 ft	-5,989 ft
PECAN GAP	7,235 ft	-6,844 ft
TOP AUSTIN CHALK (Austin Chalk)	7,617 ft	-7,226 ft
AUSTIN CHALK	7,640 ft	-7,249 ft
BASE OF AUSTIN CHALK (Austin Chalk)	8,386 ft	-7,995 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
7,718–8,243 ft	Perforated
7,764–8,218 ft	Perforated
8,056–8,386 ft	Perforated
8,056–8,386 ft	Open hole

Casing (2)

Size	Set Depth	Cement
9.625"	3,602 ft	1,050 sx
5.5"	8,054 ft	500 sx

Permit History (2)

#487056 Recompletion Unperfed Completion

ZIEHR, LILLIAN · 13,000 ft

1999-08-27

Spud 1999-09-01

#242539 Drill Final Completion

LILLIAN ZIEHR UNIT · 9,200 ft

1984-06-11

Spud 1984-08-19

Applications (2)

#487056 A UNION PACIFIC RESOURCES COMPANY

received 1999-08-27

#242539 A SANTA FE - WINDSOR PRODUCING CO.

received 1984-03-16

Records & Logs

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

W-2/G-1 2010-06-10

W-2/G-1 2007-01-30

W-2/G-1 2000-01-07 log on file

W-2/G-1 1984-12-14

W-2/G-1 1985-01-05

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 LEE County.

Well Details

Well Number: 1A
Max Depth: 13,000 ft
Drill Type: Horizontal, Sidetrack
County: LEE
District: 3
Operator: MAGNOLIA OIL & GAS OPERATING LLC
Completed: 1984-10-31

Operator

Name: MAGNOLIA OIL & GAS OPER LLC
Location: HOUSTON
P-5 Status: X (filed 2026-05-06)
Cum Oil (all leases): 73,106,082 bbl
Cum Gas (all leases): 451,822,685 mcf
Activities: CSGD/G, CSGD/P, G/PUR, OPRS/G, OPRS/O
Total Permits: 599