TEXAS · WELLS · SUTTON COUNTY · API 42-435-39097 · DISTRICT 6E
Mayfield 46 #28
Sutton County · Sawyer (Strawn North) field · SWR-10-Well · Vertical
Mayfield 46 #28 (API 42-435-39097) is a well in Sutton County operated by Upp Operating LLC, completed December 18, 2008 and listed as swr-10-well on the RRC schedule.
The RRC has issued one drilling permit, issued October 3, 2008, permitted to 8,412 ft.
It was permitted by Highmount Expl & Prod Texas LLC 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.
Its 2 leases have reported 367 barrels of oil and 255K mcf of gas since December 2008, last reporting volume in April 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Highmount Expl & Prod Texas LLC; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Mar 6, 2026
- Permits on file
- 33
- Phone
- (713) 495-5300
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Upp Operating LLC |
| Production reports | Upp Operating, LLCthrough Apr 2026 |
| Latest permit | Highmount Expl & Prod Texas LLCOct 3, 2008 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,412
- total depth, ft
- 1
- permits on file
- Oct 3, 2008
- last permit issued
- Dec 18, 2008
- completed
- 367
- cumulative oil, bbl
- 255K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2008 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 18, 2008
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 46 G-9-246746 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 367 | 255K | Dec 2008 – Apr 2026 |
| Mayfield 46 G-9-246747 | Sawyer (Strawn, North) | Upp Operating, LLC | 1 | 0 | 0 | Dec 2008 – — |
Gas, mcf lease total
Last 12 months 790 · prior 12 628(+26%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Highmount Expl & Prod Texas LLCDec 2008 → Sep 2014
- 2Enervest Operating, L.L.C.Oct 2014 → Mar 2019
- 3Upp Operating, LLCApr 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 671291-99 | Drill | Highmount Expl & Prod Texas LLC | Sep 16, 2008 | Oct 3, 2008 | Nov 23, 2008 | 8,700 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 18, 2008 | Mayfield 46 G-9-246747 | Sawyer (Strawn North) | Upp Operating LLC | SWR-10-Well · shut in Dec 1, 2008 | 8,412 |
| Dec 18, 2008 | Mayfield 46 G-9-246746 | Sawyer (Canyon) | Upp Operating LLC | Producing | 8,412 |
Formation tops
As filed on W-2/G-1. Subsea from 2,230 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 808 | 1,422 |
| Wolfcamp | 3,543 | -1,313 |
| Canyon | 6,142 | -3,912 |
| Strawn | 7,658 | -5,428 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,164 | 7,154 | Perforated |
| 7,660 | 8,360 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 299 | 17.5 | 500 S |
| 8.625 | 2,398 | 11 | 620 S |
| 4.5 | 8,408 | 7.875 | 700 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | May 21, 2009 | Feb 13, 2009 | Yes |
| 00 | May 1, 2009 | — | — |
Well logs
2 logs loaded from the RRC's log index, the latest received Jan 3, 2012. Density, Neutron, Resistivity. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| NEUTRON/DENSITY POROSITYSpans Wolfcamp, Canyon, Strawn | TIFF | 6,000 to 8,412 | Jan 3, 2012run Dec 2, 2008 | 2.23 |
| RESISTIVITYSpans Wolfcamp, Canyon, Strawn | TIFF | 6,000 to 8,422 | Jan 3, 2012run Dec 2, 2008 | 2.81 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-435-39097 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-39097 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it.
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/43539097, documented in the API reference.