WELL · 42-115-31923 · DISTRICT 8
Mason Heirs #1
Dawson County · Patricia West (Spraberry) field · Vertical
Mason Heirs #1 (API 42-115-31923) is a well in Dawson County operated by Coastal Plains Energy Inc., completed February 9, 1984.
The RRC has issued one drilling permit, issued December 29, 1983, permitted to 8,600 ft.
It was permitted by Murexco Petroleum, Inc. and has since transferred to Coastal Plains Energy Inc. on the wellbore schedule.
Completion filings report 4 formation tops, including Leonard, U. Spraberry, Miles Sandstone, L. Spraberry.
Its 2 leases have reported 51.4K barrels of oil and 44 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
Permitted by Murexco Petroleum, Inc.; the EWA schedule now lists a different operator.
Oklahoma City, OK · P-5 Y, filed Apr 4, 2026 · 37 permits on file · (405) 601-5446
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Coastal Plains Energy Inc. |
| Production reports | Coastal Plains Energy, Inc.through Oct 2025 |
| Latest permit | Murexco Petroleum, Inc.Dec 29, 1983 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,600
- total depth, ft
- 1
- permits on file
- Dec 29, 1983
- last permit issued
- Feb 9, 1984
- completed
- 51.4K
- cumulative oil, bbl
- 44
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 9, 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 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 |
|---|---|---|---|---|---|---|
| Mason Heirs O-10-57620 | Spraberry (Trend Area) | Coastal Plains Energy, Inc. | 1 | 3.8K | 0 | Jul 2022 – Jul 2026 |
| Mason Heirs O-11-64739 | Patricia, West (Spraberry) | Coastal Plains Energy, Inc. | 1 | 47.6K | 44 | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 240 · prior 12 1,219(-80%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Longhorn Oil Properties, Inc.Jan 1993 → Mar 1998
- 2Coastal Plains Energy, Inc.Apr 1998 → Oct 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 224825-99 | Drill | Murexco Petroleum, Inc. | Mar 16, 1984 | Dec 29, 1983 | Jan 15, 1984 | 8,600 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-11-64739 | — | — | — | — |
| — | — O-10-57620 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,934 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| LeonardLEONARD LIMESTONE | 7,830 | -4,896 |
| U. Spraberry | 8,130 | -5,196 |
| Miles Sandstone | 8,400 | -5,466 |
| L. Spraberry | 8,520 | -5,586 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,407 | 8,464 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 355 | 17.5 | 370 S |
| 8.625 | 4,380 | 12.25 | 625 S |
| 4.5 | 8,596 | 7.875 | 775 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 | Oct 13, 2022 | Mar 19, 1984 | — |
| 00 | Apr 24, 1984 | Mar 19, 1984 | — |
| 00 | Apr 3, 1984 | Mar 19, 1984 | — |
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 42-115-31923 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-115-31923 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. 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/11531923, documented in the API reference.