TEXAS · WELLS · SUTTON COUNTY · API 42-435-35043 · DISTRICT 6E
Mayfield 45 #9
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.
Mayfield 45 #9 (API 42-435-35043) is a well in Sutton County operated by Upp Operating LLC, completed March 4, 2000 and listed as swr-10-well on the RRC schedule.
The RRC has issued one drilling permit, issued January 3, 2000, permitted to 8,400 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.
Its 2 leases have reported 512 barrels of oil and 529K mcf of gas since March 2000, 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 Dreyfus, Louis Natural Gas Corp; 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 | Dreyfus, Louis Natural Gas CorpJan 3, 2000 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,400
- total depth, ft
- 1
- permits on file
- Jan 3, 2000
- last permit issued
- Mar 4, 2000
- completed
- 512
- cumulative oil, bbl
- 529K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 2000 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 4, 2000
- 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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
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-9-177606 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 512 | 529K | Mar 2000 – Apr 2026 |
| Mayfield 45 G-9-177608 | Sawyer (Strawn, North) | Upp Operating, LLC | 1 | 0 | 0 | Mar 2000 – — |
Gas, mcf lease total
Last 12 months 5,963 · prior 12 4,800(+24%)
Wells named Mayfield 45
Upp Operating LLC's other wells filed under this lease name in Sutton County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Dreyfus, Louis Natural Gas CorpMar 2000 → Nov 2001
- 2Dominion Oklahoma Texas E&P, IncDec 2001 → Dec 2007
- 3Highmount Expl & Prod Texas LLCJan 2008 → Sep 2014
- 4Enervest Operating, L.L.C.Oct 2014 → Mar 2019
- 5Upp Operating, LLCApr 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 490804-99 | Drill | Dreyfus, Louis Natural Gas Corp | Jan 3, 2000 | Jan 3, 2000 | Feb 14, 2000 | 8,400 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Mar 4, 2000 | Mayfield 45 G-9-177608 | Sawyer (Strawn North) | Upp Operating LLC | SWR-10-Well · shut in Oct 1, 2000 | 8,400 |
| Mar 4, 2000 | Mayfield 45 G-9-177606 | Sawyer (Canyon) | Upp Operating LLC | Producing | 8,400 |
Formation tops
As filed on W-2/G-1. Subsea from 2,264 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 853 | 1,411 |
| Wolfcamp | 3,439 | -1,175 |
| Canyon | 6,128 | -3,864 |
| Strawn | 7,617 | -5,353 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,230 | 7,284 | Perforated |
| 7,618 | 7,716 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 2,366 | 11 | 500 S |
| 4.5 | 8,043 | 7.875 | 650 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 | Aug 14, 2000 | Jun 12, 2000 | Yes |
| 00 | Aug 14, 2000 | Jun 7, 2000 | — |
| 00 | Jul 14, 2000 | — | — |
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 42-435-35043 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-35043 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here 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/43535043, documented in the API reference.