TEXAS · WELLS · SUTTON COUNTY · MAYFIELD 34 LEASE · API 42-435-34579 · DISTRICT 6E
Mayfield 34 #10
Sutton County · Sawyer (Canyon) field · Producing · Vertical
- Fields on the latest permit · any of 2
- Sawyer (Canyon) · Sawyer (Strawn, North)
- Not one formation; the well must be completed in one of them, and no target formation is stated.
Mayfield 34 #10 (API 42-435-34579) is a well in Sutton County operated by Upp Operating LLC, completed November 11, 1996 and listed as producing on the RRC schedule.
The RRC has issued 2 drilling permits between 1996 and 1997, permitted to 8,322 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 lease has reported 380 barrels of oil and 401K mcf of gas since May 1996, last reporting volume in April 2026.
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 CorpFeb 20, 1997 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,322
- total depth, ft
- 2
- permits on file
- Feb 20, 1997
- last permit issued
- Nov 11, 1996
- completed
- 380
- cumulative oil, bbl
- 401K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 1996 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 11, 1996
- 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 lease this well is completed on; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mayfield 34 G-9-159947 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 380 | 401K | May 1996 – Apr 2026 |
Gas, mcf lease total
Last 12 months 1,834 · prior 12 1,682(+9%)
Wells named Mayfield 34
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 CorpNov 1996 → 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 |
|---|---|---|---|---|---|---|
| 458877-99 | Recompletion | Dreyfus, Louis Natural Gas Corp | Apr 29, 1996 | Feb 20, 1997 | May 16, 1996 | 8,450 |
| 447532-99 | Drill | Dreyfus, Louis Natural Gas Corp | Apr 29, 1996 | Apr 29, 1996 | May 16, 1996 | 8,450 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 11, 1996 | Mayfield 34 G-9-159947 | Sawyer (Canyon) | Upp Operating LLC | Producing | 8,322 |
| Nov 11, 1996 | Mayfield 34 G-9-159947 | Sawyer (Canyon) | Upp Operating LLC | Producing | 8,322 |
Formation tops
As filed on W-2/G-1. Subsea from 2,181 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 748 | 1,433 |
| Wolfcamp | 3,489 | -1,308 |
| Canyon | 6,241 | -4,060 |
| Strawn | 7,702 | -5,521 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,292 | 7,088 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,817 | 11 | 450 S |
| 4.5 | 8,234 | 7.875 | 800 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 | Mar 19, 1997 | Feb 10, 1997 | Yes |
| 00 | Oct 24, 1996 | Sep 18, 1996 | Yes |
| 00 | Oct 3, 1996 | — | — |
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 42-435-34579 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-34579 → 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/43534579, documented in the API reference.