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TEXAS · WELLS · FAYETTE COUNTY · API 42-149-32567 · DISTRICT 03

Mahlmann-Walther Unit #1

Y

Fayette County · Giddings (Austin Chalk-3) field · Producing  · Horizontal · Sidetrack

Mahlmann-Walther Unit #1 (API 42-149-32567) is a horizontal well in Fayette County operated by Magnolia Oil & Gas Operating LLC, completed March 18, 1998 and listed as producing on the RRC schedule.

The RRC has issued 2 drilling permits (amended twice) between 1991 and 1998, permitted to 13,514 ft.

It was permitted by Union Pacific Resources Company and has since transferred to Magnolia Oil & Gas Operating LLC on the wellbore schedule.

Completion filings report 6 formation tops, including Midway, Navarro, Taylor, Pecan Gap.

Its 3 leases have reported 150K barrels of oil and 3.85M mcf of gas since January 1993, last reporting in July 2026. The leases carry 2 wells, so these are lease totals, not this well alone.

Operator of record

Magnolia Oil & Gas Operating LLC

Permitted by Union Pacific Resources Company; the EWA schedule now lists a different operator.

Based in
Houston, TX
P-5 status
Active – Extension (X)
P-5 last filed
May 6, 2026
Permits on file
615
Phone
(713) 842-9050
Watch this operatorWatch Fayette County

SOURCE · RRC EWA WELLBORE SCHEDULE

What each RRC source says

Wellbore scheduleMagnolia Oil & Gas Operating LLC
Production reportsMagnolia Oil & Gas Operating LLCthrough Apr 2026
Latest permitUnion Pacific Resources CompanyFeb 13, 1998

The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.

13,514
total depth, ft
4
permits on file
Feb 13, 1998
last permit issued
Mar 18, 1998
completed
150K
cumulative oil, bbl
3.85M
cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026

Regulatory status · RRC wellbore file

Schedule
ON SCHEDULE
Completed
Mar 18, 1998
Shut in
—
Plugged
—

Operator's P-5 on the schedule: Active (A)

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 3 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →

LeaseFieldReporting operatorWellsOil, bblGas, mcfReported
Mahlmann-Walther Unit O-3-23765Giddings (Austin Chalk-3)Magnolia Oil & Gas Operating LLC1150K1.54MSep 1999 – Jul 2026
Mahlmann-Walther Unit G-3-141715Giddings (Austin Chalk, Gas)Union Pacific Resources Company102.3MJan 1993 – Sep 1999
— O-3-21443——000—

Gas, mcf lease total

Last 12 months 11,959 · prior 12 14,499(-18%)

01K2K202420252026

Oil, barrels lease total

Last 12 months 183 · prior 12 606(-70%)

0100200202420252026

Chain of custody

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

  1. 1Union Pacific Resources CompanyJan 1993 → Jan 2001
  2. 2Rme Petroleum CompanyFeb 2001 → Nov 2002
  3. 3Anadarko E&P Company LPDec 2002 → Jul 2007
  4. 4Enervest Operating, L.L.C.Aug 2007 → Jul 2018
  5. 5Magnolia Oil & Gas Operating LLCAug 2018 → Apr 2026

Permits

PermitTypeOperatorReceivedIssuedSpudDepth
473338-99Recompletion · sidetrackUnion Pacific Resources CompanyFeb 13, 1998Feb 13, 1998Feb 23, 199810,500
395524-97DrillUnion Pacific Resources CompanyMay 4, 1992Dec 31, 1991—14,800
395524-98DrillUnion Pacific Resources CompanyFeb 12, 1992Dec 31, 1991—14,800
395524-99DrillUnion Pacific Resources CompanyDec 31, 1991Dec 31, 1991Feb 12, 199214,800

Completions

CompletedLeaseFieldOperatorStatusDepth
Mar 18, 1998Mahlmann-Walther Unit O-3-23765Giddings (Austin Chalk-3)Magnolia Oil & Gas Operating LLCProducing13,514
Mar 23, 1992Mahlmann-Walther Unit G-3-141715Giddings (Austin Chalk Gas)Union Pacific Resources CompanyNot on Schedule—
Mar 23, 1992Mahlmann-Walther Unit O-3-21443Giddings (Austin Chalk-3)Union Pacific Resources CompanyNot on Schedule—

Formation tops

As filed on W-2/G-1. Subsea from 318 ft elevation.Download CSV →

FormationMD ftSubsea
Midway6,323-6,005
Navarro7,158-6,840
Taylor7,738-7,420
Pecan Gap8,528-8,210
Ausitn Chalk9,023-8,705
Austin Chalk9,023-8,705

Perforations

Perforated and open-hole intervals.

FromToType
9,20013,514Perforated
9,20013,514Open hole
9,4359,883Perforated
9,43911,803Perforated
9,62611,866Perforated
9,64711,866Perforated

Casing

Strings as reported, shallowest first.

Casing inSet atHole inCement
10.753,15014.751,220 S
7.6259,2009.875340 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 →

SuffixFiledW-2 / G-1 dateLogs referenced
00Mar 1, 2000Dec 3, 1999Yes
00Feb 29, 2000Apr 16, 1998Yes
00Feb 10, 2000——
00Sep 15, 1992Jun 30, 1992—
00Jul 30, 1992——
00Apr 24, 1992Apr 1, 1992Yes
00Apr 17, 1992——

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.

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/14932567, documented in the API reference.