WELL · 42-287-31588 · DISTRICT 3
Ziehr Lillian Unit #1A
Lee County · Giddings (Austin Chalk-3) field · Horizontal · Sidetrack
Ziehr Lillian Unit #1A (API 42-287-31588) is a horizontal well in Lee County operated by Magnolia Oil & Gas Operating LLC, completed October 31, 1984.
The RRC has issued 2 drilling permits between 1984 and 1999, permitted to 13,000 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 3 formation tops, including Navarro, Pecan Gap, Austin Chalk.
Its lease has reported 21.4K barrels of oil and 46K mcf of gas since January 1993, last reporting in July 2026. The lease carries 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.
Houston, TX · P-5 Y, filed Mar 4, 2026 · 615 permits on file · (713) 345-6206
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Magnolia Oil & Gas Operating LLC |
| Production reports | Union Pacific Resources Companythrough Aug 1999 |
| Latest permit | Union Pacific Resources CompanyAug 27, 1999 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 13,000
- total depth, ft
- 2
- permits on file
- Aug 27, 1999
- last permit issued
- Oct 31, 1984
- completed
- 21.4K
- cumulative oil, bbl
- 46K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Oct 31, 1984
- 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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Ziehr, Lillian Unit O-3-14499 | Giddings (Austin Chalk-3) | Magnolia Oil & Gas Operating LLC | 2 | 21.4K | 46K | Jan 1993 – Jul 2026 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Union Pacific Resources CompanyJan 1993 → Aug 1999
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 487056-99 | Recompletion · sidetrack | Union Pacific Resources Company | Aug 27, 1999 | Aug 27, 1999 | Sep 1, 1999 | 13,000 |
| 242539-99 | Drill | Santa FE - Windsor Producing Co. | Mar 16, 1984 | Jun 11, 1984 | Aug 19, 1984 | 9,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-3-14499 | — | — | — | — |
| — | — O-3-14499 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 391 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Navarro | 5,860 | -5,469 |
| NavarroNAVARRO #2 | 6,380 | -5,989 |
| NavarroNAVARRO 2 | 6,380 | -5,989 |
| Pecan Gap | 7,235 | -6,844 |
| Austin ChalkTOP AUSTIN CHALK | 7,617 | -7,226 |
| Austin Chalk | 7,640 | -7,249 |
| Austin ChalkBASE OF AUSTIN CHALK | 8,386 | -7,995 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,718 | 8,243 | Perforated |
| 7,764 | 8,218 | Perforated |
| 8,056 | 8,386 | Perforated |
| 8,056 | 8,386 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 3,602 | 12.25 | 1,050 S |
| 5.5 | 8,054 | 8.75 | 500 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 | Aug 9, 2010 | Jun 10, 2010 | — |
| 00 | Apr 30, 2007 | Jan 30, 2007 | — |
| 00 | Feb 10, 2000 | Jan 7, 2000 | Yes |
| 00 | Jan 21, 2000 | Dec 14, 1984 | — |
| 00 | Jan 11, 1985 | Dec 14, 1984 | — |
| 00 | Jan 5, 1985 | — | — |
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 42-287-31588 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-287-31588 → 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/28731588, documented in the API reference.