WELL · 42-211-31718 · DISTRICT 10
Gulf-Mesa Sappington #4
Hemphill County · Hemphill (Granite Wash.) field · Producing · Vertical
Gulf-Mesa Sappington #4 (API 42-211-31718) is a well in Hemphill County operated by Mountainside Energy Operating L, completed December 1, 1984 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued September 6, 1984, permitted to 11,600 ft.
It was permitted by Gulf Oil Corp. and has since transferred to Mountainside Energy Operating L on the wellbore schedule.
Completion filings report 6 formation tops, including Brown Dolomite, Douglas, Tonkawa, Cleveland.
No lease production has been reported under this well’s leases.
Operator of record
Mountainside Energy Operating L
Permitted by Gulf Oil Corp.; the EWA schedule now lists a different operator.
Dallas, TX · P-5 Y, filed Jan 21, 2026 · (855) 906-6868
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Mountainside Energy Operating L |
| Production reports | Mountainside Energy Operating, Lthrough Mar 2026 |
| Latest permit | Gulf Oil Corp.Sep 6, 1984 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,600
- total depth, ft
- 1
- permits on file
- Sep 6, 1984
- last permit issued
- Dec 1, 1984
- completed
- 0
- cumulative oil, bbl
- 1.15M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 1, 1984
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Gulf-Mesa Sappington G-14-115069 | Hemphill (Granite Wash.) | Mountainside Energy Operating, L | 1 | 0 | 1.15M | Jan 1993 – Jul 2026 |
Gas, mcf lease total
Last 12 months 17,379 · prior 12 19,331(-10%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Chevron U. S. A. Inc.Jan 1993 → Nov 2016
- 2Pantera Energy CompanyDec 2016 → Jul 2021
- 3Highmark Energy Operating, LLCAug 2021 → Jan 2026
- 4Mountainside Energy Operating, LFeb 2026 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 250555-99 | Drill | Gulf Oil Corp. | Sep 4, 1984 | Sep 6, 1984 | — | 11,600 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-14-115069 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,700 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Brown Dolomite | 4,324 | -1,624 |
| DouglasDOUGLAS SAND | 7,622 | -4,922 |
| TonkawaTONKAWA SAND | 8,386 | -5,686 |
| ClevelandCLEVELAND SAND | 8,819 | -6,119 |
| Oswego | 9,904 | -7,204 |
| Granite Wash | 10,640 | -7,940 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,748 | 10,818 | Perforated |
| 10,914 | 10,976 | Perforated |
| 10,990 | 11,000 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 3,004 | 12.25 | 1,650 S |
| 5.5 | 11,381 | 7.875 | 360 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 | Mar 12, 1985 | Jan 24, 1985 | — |
| 00 | Mar 5, 1985 | Dec 20, 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 42-211-31718 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-211-31718 → 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/21131718, documented in the API reference.