TEXAS · WELLS · SUTTON COUNTY · API 42-435-36378 · DISTRICT 6E
Mayer 20 #4
Sutton County · Sawyer (Strawn North) field · SWR-10-Well · Vertical
- Fields on the latest permit · any of 3
- Fawcett (Wolfcamp) · Sawyer (Canyon) · Sawyer (Strawn, North)
- Not one formation; the well must be completed in one of them, and no target formation is stated.
Mayer 20 #4 (API 42-435-36378) is a well in Sutton County operated by Upp Operating LLC, completed November 18, 2003 and listed as swr-10-well on the RRC schedule.
The RRC has issued one drilling permit, issued July 25, 2003, permitted to 8,727 ft.
It was permitted by Dominion Oklahoma Texas E&P, Inc 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 189 barrels of oil and 462K mcf of gas since November 2003, 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 Dominion Oklahoma Texas E&P, Inc; 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 | Dominion Oklahoma Texas E&P, IncJul 25, 2003 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,727
- total depth, ft
- 1
- permits on file
- Jul 25, 2003
- last permit issued
- Nov 18, 2003
- completed
- 189
- cumulative oil, bbl
- 462K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 2003 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 18, 2003
- 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 |
|---|---|---|---|---|---|---|
| Mayer 20 G-9-205403 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 189 | 462K | Nov 2003 – Apr 2026 |
| Mayer 20 G-9-205472 | Sawyer (Strawn, North) | Upp Operating, LLC | 1 | 0 | 0 | Nov 2003 – — |
Gas, mcf lease total
Last 12 months 2,783 · prior 12 2,195(+27%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Dominion Oklahoma Texas E&P, IncNov 2003 → 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 |
|---|---|---|---|---|---|---|
| 532897-99 | Drill | Dominion Oklahoma Texas E&P, Inc | Jun 9, 2003 | Jul 25, 2003 | Oct 26, 2003 | 8,650 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 18, 2003 | Mayer 20 G-9-205472 | Sawyer (Strawn North) | Upp Operating LLC | SWR-10-Well · shut in Nov 1, 2003 | 8,727 |
| Nov 18, 2003 | Mayer 20 G-9-205403 | Sawyer (Canyon) | Upp Operating LLC | Producing | 8,727 |
Formation tops
As filed on W-2/G-1. Subsea from 2,220 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 805 | 1,415 |
| Wolfcamp | 3,464 | -1,244 |
| Canyon | 6,382 | -4,162 |
| Strawn | 8,141 | -5,921 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,386 | 7,236 | Perforated |
| 8,438 | 8,570 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 386 | 17.5 | 400 S |
| 8.625 | 2,414 | 11 | 650 S |
| 4.5 | 8,697 | 7.875 | 680 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 | Apr 7, 2005 | Feb 4, 2004 | — |
| 00 | Apr 5, 2005 | Feb 4, 2004 | Yes |
| 00 | Jan 24, 2005 | — | — |
| 00 | Jan 19, 2005 | — | — |
Well logs
The RRC's map lists this well among those with logs online. Its monthly inventories loaded here, which start in July 2006, list none for it, so none are itemized.
Open the RRC's log search for this well ↗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 42-435-36378 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-36378 → 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/43536378, documented in the API reference.