WELL · 42-435-38754 · DISTRICT 7
Mayer Ranch 40 #4
Sutton County · Sawyer (Strawn North) field · Producing · Vertical
Mayer Ranch 40 #4 (API 42-435-38754) is a well in Sutton County operated by Upp Operating LLC, completed June 23, 2008 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued November 7, 2007, permitted to 8,550 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.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Highmount Expl & Prod Texas LLC; 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 | Highmount Expl & Prod Texas LLCNov 7, 2007 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,550
- total depth, ft
- 2
- permits on file
- Nov 7, 2007
- last permit issued
- Jun 23, 2008
- completed
- 0
- cumulative oil, bbl
- 87.9K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jun 2008 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jun 23, 2008
- 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 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 |
|---|---|---|---|---|---|---|
| Mayer Ranch 40 G-9-241222 | Sawyer (Strawn, North) | Upp Operating, LLC | 1 | 0 | 87.9K | Jun 2008 – Jul 2026 |
Gas, mcf lease total
Last 12 months 1,184 · prior 12 1,312(-10%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Highmount Expl & Prod Texas LLCJun 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 |
|---|---|---|---|---|---|---|
| 648880-98 | Drill | Highmount Expl & Prod Texas LLC | Apr 15, 2008 | Nov 7, 2007 | Dec 18, 2007 | 8,550 |
| 648880-99 | Drill | Dominion Oklahoma Texas E&P, Inc | Nov 1, 2007 | Nov 7, 2007 | Dec 18, 2007 | 8,550 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-9-241222 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,249 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 861 | 1,388 |
| Wolfcamp | 4,191 | -1,942 |
| Canyon | 6,861 | -4,612 |
| Strawn | 8,011 | -5,762 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,252 | 8,326 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,195 | 11 | 441 S |
| 4.5 | 8,477 | 7.875 | 525 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 | Nov 6, 2008 | Jul 24, 2008 | Yes |
| 00 | Oct 28, 2008 | — | — |
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 42-435-38754 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-38754 → 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/43538754, documented in the API reference.