TEXAS · WELLS · GLASSCOCK COUNTY · API 42-173-31765 · DISTRICT 7B
Shamrock -4- #1
Glasscock County · Dewey Lake S. (Strawn) field · Vertical
Shamrock -4- #1 (API 42-173-31765) is a plugged well in Glasscock County, plugged May 21, 2024, last operated by Pioneer Natural Res. USA Inc..
The RRC has issued one drilling permit, issued December 18, 1984, permitted to 10,500 ft.
It was permitted by Mwj Producing Company and has since transferred to Pioneer Natural Res. USA Inc. on the wellbore schedule.
Completion filings report 6 formation tops, including Clear Fork, Spraberry, Wichita-Albany, Dean.
Its 2 leases have reported 1.53K barrels of oil and 127K mcf of gas since January 1993, last reporting in May 2024. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by MWJ Producing Company; the EWA schedule now lists a different operator.
- Based in
- Spring, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jul 8, 2026
- Permits on file
- 15,628
- Phone
- (972) 444-4001
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Pioneer Natural Res. USA Inc. |
| Production reports | Pioneer Natural Res. USA, Inc.through Jan 2022 |
| Latest permit | MWJ Producing CompanyDec 18, 1984 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,500
- total depth, ft
- 1
- permits on file
- Dec 18, 1984
- last permit issued
- Apr 1, 1985
- completed
- 1.53K
- cumulative oil, bbl
- 127K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH May 2024
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Apr 1, 1985
- Shut in
- —
- Plugged
- May 21, 2024
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 |
|---|---|---|---|---|---|---|
| Shamrock -4- G-10-246996 | Dewey Lake, S. (Strawn) | Pioneer Natural Res. USA, Inc. | 1 | 0 | 39.7K | May 2009 – May 2024 |
| Shamrock -4- O-10-30755 | Dewey Lake, S. (Strawn) | Northstar Operating Company | 1 | 1.53K | 87.3K | Jan 1993 – Feb 2010 |
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.
- 1MWJ Producing CompanyJan 1993 → Jan 1996
- 2Limark CorporationFeb 1996 → Nov 2003
- 3Northstar Operating CompanyMay 2009 → Oct 2016
- 4De Operating LLCNov 2016 → Apr 2017
- 5Parsley Energy Operations, LLCMay 2017 → Jan 2021
- 6Pioneer Natural Res. USA, Inc.Feb 2021 → Jan 2022
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 261429-99 | Drill | MWJ Producing Company | Dec 17, 1984 | Dec 18, 1984 | — | 10,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Apr 1, 1985 | Shamrock -4- G-10-246996 | Dewey Lake S. (Strawn) | Pioneer Natural Res. USA Inc. | Plugged | — |
| Apr 1, 1985 | Shamrock -4- O-10-30755 | Dewey Lake S. (Strawn) | Northstar Operating Company | Plugged | — |
| Apr 1, 1985 | Shamrock 4 O-10-29737 | Arlis (Strawn) | MWJ Producing Company | Plugged | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,721 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Clear ForkLOWER CLEARFORK | 6,042 | -3,321 |
| SpraberryUPPER SPRABERRY | 6,355 | -3,634 |
| SpraberryMIDDLE SPRABERRY | 7,000 | -4,279 |
| SpraberryLOWER SPRABERRY | 7,338 | -4,617 |
| Wichita-AlbanyWICHITA ALBANY | 7,750 | -5,029 |
| Dean | 7,892 | -5,171 |
| Wolfcamp | 8,410 | -5,689 |
| Strawn | 10,030 | -7,309 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,030 | 10,270 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 400 | 17.5 | 400 S |
| 9.625 | 3,555 | 12.25 | 350 S |
| 7 | 8,250 | 8.75 | 600 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 | Jun 18, 2009 | May 5, 2009 | — |
| 00 | May 13, 2009 | — | — |
| 00 | Jul 16, 1986 | Apr 8, 1985 | — |
| 00 | Jul 8, 1986 | Apr 8, 1985 | — |
| 00 | Jun 25, 1986 | — | — |
| 00 | Apr 29, 1985 | Apr 8, 1985 | — |
| 00 | Apr 24, 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 42-173-31765 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-173-31765 → 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/17331765, documented in the API reference.