WELL · 42-435-35690 · DISTRICT 7
Mayfield 45 #12
Sutton County · Sawyer (Strawn North) field · SWR-10-Well · Vertical
Mayfield 45 #12 (API 42-435-35690) is a well in Sutton County operated by Upp Operating LLC, completed January 17, 2002 and listed as swr-10-well on the RRC schedule.
The RRC has issued one drilling permit, issued November 21, 2001, permitted to 8,450 ft.
It was permitted by Dreyfus, Louis Natural Gas Corp and has since transferred to Upp Operating LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Base Cretaceous (marker), Wolfcamp, Canyon, Strawn.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Dreyfus, Louis Natural Gas Corp; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Dec 4, 2025 · 33 permits on file · (817) 389-2729
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Upp Operating LLC |
| Production reports | Upp Operating, LLCthrough Apr 2026 |
| Latest permit | Dreyfus, Louis Natural Gas CorpNov 21, 2001 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,450
- total depth, ft
- 1
- permits on file
- Nov 21, 2001
- last permit issued
- Jan 17, 2002
- completed
- 0
- cumulative oil, bbl
- 291K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 2002 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 17, 2002
- 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 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 |
|---|---|---|---|---|---|---|
| Mayfield 45 G-9-189633 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 0 | 291K | Jan 2002 – Jul 2026 |
| Mayfield 45 G-9-189634 | Sawyer (Strawn, North) | Upp Operating, LLC | 1 | 0 | 0 | Jan 2002 – Jul 2026 |
Gas, mcf lease total
Last 12 months 450 · prior 12 490(-8%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Dominion Oklahoma Texas E&P, IncJan 2002 → Dec 2007
- 2Highmount Expl & Prod Texas LLCJan 2008 → Sep 2014
- 3Enervest Operating, L.L.C.Oct 2014 → Mar 2019
- 4Upp Operating, LLCApr 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 515550-99 | Drill | Dreyfus, Louis Natural Gas Corp | Nov 21, 2001 | Nov 21, 2001 | Dec 11, 2001 | 8,450 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-9-189633 | — | — | — | — |
| — | — G-9-189634 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,202 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 791 | 1,411 |
| Wolfcamp | 3,370 | -1,168 |
| Canyon | 6,081 | -3,879 |
| Strawn | 7,721 | -5,519 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,083 | 7,234 | Perforated |
| 8,111 | 8,126 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 281 | 17.5 | 290 S |
| 8.625 | 2,399 | 11 | 725 S |
| 4.5 | 8,411 | 7.875 | 725 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 | Aug 27, 2002 | Apr 19, 2002 | Yes |
| 00 | Jul 31, 2002 | — | — |
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 42-435-35690 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-35690 → 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/43535690, documented in the API reference.