WELL · 42-435-36128 · DISTRICT 7
Mayfield 46 #18
Sutton County · Sawyer (Strawn North) field · Vertical
Mayfield 46 #18 (API 42-435-36128) is a well in Sutton County operated by Enervest Operating L.L.C., completed February 8, 2003.
The RRC has issued 2 drilling permits (amended once) between 2002 and 2013, permitted to 8,550 ft.
It was permitted by Highmount Expl & Prod Texas LLC and has since transferred to Enervest Operating L.L.C. on the wellbore schedule.
Completion filings report 5 formation tops, including Base Cretaceous (marker), Leonard, Wolfcamp, Canyon.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Highmount Expl & Prod Texas LLC; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Oct 4, 2025 · 1,249 permits on file · (713) 659-3500
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Enervest Operating L.L.C. |
| Production reports | Upp Operating, LLCthrough Apr 2026 |
| Latest permit | Highmount Expl & Prod Texas LLCSep 18, 2013 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,550
- total depth, ft
- 3
- permits on file
- Sep 18, 2013
- last permit issued
- Feb 8, 2003
- completed
- 0
- cumulative oil, bbl
- 294K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Feb 2003 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 8, 2003
- 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 3 leases this well is completed on; they carry 3 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mayfield 46 G-9-198664 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 0 | 265K | Feb 2003 – Jul 2026 |
| Mayfield 46 G-9-279819 | Fawcett (Wolfcamp) | Upp Operating, LLC | 1 | 0 | 29.4K | Oct 2013 – Jul 2026 |
| Mayfield 46 G-9-198666 | Sawyer (Strawn, North) | Enervest Operating, L.L.C. | 1 | 0 | 0 | Feb 2003 – Feb 2016 |
Gas, mcf lease total
Last 12 months 1,001 · prior 12 1,313(-24%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Dominion Oklahoma Texas E&P, IncFeb 2003 → Dec 2007
- 2Highmount Expl & Prod Texas LLCJan 2008 → Mar 2014
- 3Enervest Operating, L.L.C.Apr 2014 → Mar 2019
- 4Upp Operating, LLCApr 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 769756-99 | Recompletion | Highmount Expl & Prod Texas LLC | Sep 10, 2013 | Sep 18, 2013 | Oct 9, 2013 | 8,500 |
| 526613-98 | Drill | Dominion Oklahoma Texas E&P, Inc | Nov 29, 2004 | Dec 20, 2002 | — | 8,550 |
| 526613-99 | Drill | Dominion Oklahoma Texas E&P, Inc | Dec 20, 2002 | Dec 20, 2002 | Jan 18, 2003 | 8,550 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-9-198664 | — | — | — | — |
| — | — G-9-198666 | — | — | — | — |
| — | — G-9-279819 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,310 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 3,790 | 4,951 | Perforated |
| 6,234 | 7,178 | Perforated |
| 7,967 | 8,198 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 275 | 11 | 250 S |
| 13.375 | 275 | 13.5 | 250 S |
| 8.625 | 2,386 | 11 | 735 S |
| 8.625 | 2,386 | — | 735 S |
| 4.5 | 8,468 | 7.875 | 750 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 | May 5, 2016 | Mar 10, 2016 | — |
| 00 | Mar 18, 2004 | Jul 24, 2003 | Yes |
| 00 | Mar 17, 2004 | Jul 24, 2003 | — |
| 00 | Jan 28, 2004 | — | — |
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 42-435-36128 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-36128 → 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/43536128, documented in the API reference.