WELL · 42-255-32551 · DISTRICT 2

Spahn-Mikkelson Unit #2H

Spahn-Mikkelson Unit #2H (API 42-255-32551) is a permitted horizontal well in Karnes County filed by Marathon Oil EF LLC; no completion report is on file yet.

The RRC has issued 2 drilling permits between 2012 and 2013, permitted to 14,000 ft.

Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.

Its lease has reported 1.01M barrels of oil and 1.49M mcf of gas since May 2012, last reporting in July 2026. The lease carries 4 wells, so these are lease totals, not this well alone.

Operator of record

Marathon Oil EF LLC

Based in: Houston, TX
P-5 status: Active (A)
P-5 last filed: Sep 26, 2025
Permits on file: 3,191
Phone: (832) 486-2737

SOURCE · RRC EWA WELLBORE SCHEDULE

What each RRC source says

Wellbore schedule	none
Production reports	Marathon Oil EF LLCthrough Apr 2026
Latest permit	Marathon Oil EF LLCFeb 20, 2013

14,000: total depth, ft
2: permits on file
Feb 20, 2013: last permit issued
—: completed
1.01M: cumulative oil, bbl
1.49M: cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · May 2012 THROUGH Jul 2026

Regulatory status · RRC wellbore file

Schedule: OFF SCHEDULE
Completed: —
Shut in: —
Plugged: —

Surface location

No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.

Lease production

PDQ LEASE REPORTS · REPORTED THROUGH APR 2026

Texas reports oil by lease, not by well. These are the lease this well is completed on; they carry 4 wells in total, so volumes are shared.Why →

Lease	Field	Reporting operator	Wells	Oil, bbl	Gas, mcf	Reported
Spahn-Mikkelson Unit O-2-10060	Eagleville (Eagle Ford-2)	Marathon Oil EF LLC	4	1.01M	1.49M	May 2012 – Jul 2026

Oil, barrels lease total

Last 12 months 27,367 · prior 12 25,496(+7%)

Gas, mcf lease total

Last 12 months 41,250 · prior 12 40,815(+1%)

Chain of custody

Every operator that reported production on this well's lease, in order.

1Marathon Oil EF LLCMay 2012 → Apr 2026

Permits

Permit	Type	Operator	Received	Issued	Spud	Depth
756407-99	Recompletion	Marathon Oil EF LLC	Feb 7, 2013	Feb 20, 2013	—	14,000
740524-99	Drill	Marathon Oil EF LLC	May 11, 2012	May 22, 2012	Jun 23, 2012	14,000

Completions

Completed	Lease	Field	Operator	Status	Depth
—	— O-2-10060	—	—	—	—

Formation tops

As filed on W-2/G-1. Subsea from 350 ft elevation.Download CSV →

Formation	MD ft	Subsea
Anacacho	11,401	-11,051
Austin Chalk	11,545	-11,195
Eagle Ford	11,770	-11,420

Perforations

Perforated and open-hole intervals.

From	To	Type
12,265	16,645	Perforated

Casing

Strings as reported, shallowest first.

Casing in	Set at	Hole in	Cement
10.75	5,913	14.75	2,465 S
5.5	16,718	8.75	1,715 S

Completion filings

W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →

Suffix	Filed	W-2 / G-1 date	Logs referenced
00	Mar 5, 2013	Dec 20, 2012	—
00	Nov 13, 2012	Aug 30, 2012	Yes

The source documents

Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.

Wellbore filings for 42-255-32551 → W-2, G-1, plugging reports, as PDFs
Completion packets for 42-255-32551 → scanned completion filings

Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.

About this data

Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.

New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease

Developers: this page as JSON is GET /v1/data/wells/25532551, documented in the API reference.