WELL · 42-211-31254 · DISTRICT 10
Fillingim #1020
Hemphill County · Buffalo Wallow (Morrow) field · Vertical
Fillingim #1020 (API 42-211-31254) is a plugged well in Hemphill County, plugged April 11, 2023, last operated by Zephyr Lone Star Oper CO. L.L.C..
The RRC has issued 3 drilling permits between 1980 and 1995, permitted to 22,500 ft.
It was permitted by Union Oil Company Of California and has since transferred to Zephyr Lone Star Oper CO. L.L.C. on the wellbore schedule.
Completion filings report 6 formation tops, including Heebner, Douglas, Tonkawa, Cleveland.
Operator of record
Zephyr Lone Star Oper Co. L.L.C.
Permitted by Union Oil Company of California; the EWA schedule now lists a different operator.
Oklahoma City, OK · P-5 Y, filed Dec 4, 2025 · 30 permits on file · (405) 642-2504
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Zephyr Lone Star Oper Co. L.L.C. |
| Production reports | Zephyr Lone Star Oper Co.,l.l.c.through Aug 2013 |
| Latest permit | Union Oil Company of CaliforniaSep 13, 1995 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 22,500
- total depth, ft
- 3
- permits on file
- Sep 13, 1995
- last permit issued
- Oct 10, 1995
- completed
- 0
- cumulative oil, bbl
- 6.06M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Apr 2023
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Oct 10, 1995
- Shut in
- —
- Plugged
- Apr 11, 2023
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 2 leases 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 |
|---|---|---|---|---|---|---|
| Fillingim G-14-159553 | Buffalo Wallow (Morrow) | Zephyr Lone Star Oper Co.,l.l.c. | 1 | 0 | 6.06M | Oct 1995 – Apr 2023 |
| Fillingim G-14-102823 | Buffalo Wallow (Hunton 19600) | Pegasus Energy | 1 | 0 | 0 | Jan 1993 – Oct 1995 |
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.
- 1Pegasus EnergyJan 1996 → Mar 1997
- 2Zephyr Lone Star Oper Co.,l.l.c.Apr 1997 → Aug 2013
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 438044-99 | Recompletion | Union Oil Company of California | Jul 20, 1995 | Sep 13, 1995 | Sep 25, 1995 | 15,000 |
| 132767-99 | Drill | Hoover & Bracken Energies, Inc. | Jan 5, 1981 | Jan 5, 1981 | Aug 12, 1980 | 22,500 |
| 88693-99 | Drill | Hoover & Bracken Energies, Inc. | Aug 5, 1980 | Aug 5, 1980 | Aug 17, 1980 | 22,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-14-102823 | — | — | — | — |
| — | — G-14-159553 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,529 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Heebner | 7,950 | -5,421 |
| Douglas | 8,055 | -5,526 |
| Tonkawa | 8,754 | -6,225 |
| Cleveland | 10,122 | -7,593 |
| Granite Wash | 11,060 | -8,531 |
| Morrow | 13,310 | -10,781 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 13,480 | 13,500 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 3,010 | 17.5 | 3,200 S |
| 13.375 | 3,010 | 17.25 | 3,600 S |
| 9.625 | 13,355 | 12.5 | 1,300 S |
| 9.155 | 13,355 | 12.5 | 3,600 S |
| 9.625 | 13,385 | 12.25 | 1,200 S |
| 2.875 | 16,750 | — | — |
| 7.625 | 16,800 | 8.5 | 450 S |
| 5.5 | 19,470 | — | — |
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 | Nov 21, 1996 | Dec 18, 1995 | Yes |
| 00 | Aug 29, 1996 | — | — |
| 00 | Jan 12, 1984 | Feb 17, 1982 | — |
| 00 | Jan 12, 1984 | Sep 4, 1981 | — |
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 42-211-31254 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-211-31254 → 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/21131254, documented in the API reference.