TEXAS · WELLS · SUTTON COUNTY · API 42-435-39173 · DISTRICT 6E
Mayer Ranch 36 #4
Sutton County · Sawyer (Canyon) field · Producing · Vertical
Mayer Ranch 36 #4 (API 42-435-39173) is a well in Sutton County operated by Upp Operating LLC, completed December 9, 2009 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued February 27, 2009, permitted to 8,492 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 654 barrels of oil and 211K mcf of gas since March 2009, 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 LLCApr 6, 2009 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,492
- total depth, ft
- 2
- permits on file
- Apr 6, 2009
- last permit issued
- Dec 9, 2009
- completed
- 654
- cumulative oil, bbl
- 211K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2009 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 9, 2009
- 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 Ranch 36 G-9-255189 | Sawyer (Canyon) | Upp Operating, LLC | 1 | 654 | 211K | Dec 2009 – Apr 2026 |
| Mayer Ranch 36 G-9-250899 | Sawyer (Strawn, North) | Upp Operating, LLC | 1 | 0 | 0 | Mar 2009 – — |
Gas, mcf lease total
Last 12 months 2,469 · prior 12 2,976(-17%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Highmount Expl & Prod Texas LLCDec 2009 → 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 |
|---|---|---|---|---|---|---|
| 678834-98 | Drill | Highmount Expl & Prod Texas LLC | Mar 10, 2009 | Apr 6, 2009 | Mar 1, 2009 | 8,750 |
| 678834-99 | Drill | Highmount Expl & Prod Texas LLC | Feb 23, 2009 | Feb 27, 2009 | Mar 1, 2009 | 8,750 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 9, 2009 | Mayer Ranch 36 G-9-255189 | Sawyer (Canyon) | Upp Operating LLC | Producing | 8,492 |
| Mar 10, 2009 | Mayer Ranch 36 G-9-250899 | Sawyer (Strawn North) | Upp Operating LLC | SWR-10-Well · shut in Mar 1, 2009 | 8,492 |
Formation tops
As filed on W-2/G-1. Subsea from 2,314 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Base Cretaceous (marker)BASE CRETACEOUS | 1,109 | 1,205 |
| Wolfcamp | 4,302 | -1,988 |
| Canyon | 6,904 | -4,590 |
| Strawn | 7,986 | -5,672 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,450 | 7,530 | Perforated |
| 8,060 | 8,166 | Perforated |
| 8,240 | 8,384 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,104 | 11 | 340 S |
| 4.5 | 8,460 | 7.875 | 580 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 | Jun 23, 2010 | Mar 10, 2010 | — |
| 00 | Mar 26, 2010 | — | — |
| 00 | Nov 4, 2009 | Jul 22, 2009 | Yes |
| 00 | Sep 17, 2009 | — | — |
Well logs
2 logs loaded from the RRC's log index, the latest received Apr 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 | 6,800 to 8,510 | Apr 3, 2012run Mar 9, 2009 | 1.71 |
| RESISTIVITYSpans Wolfcamp, Canyon, Strawn | TIFF | 6,800 to 8,489 | Apr 3, 2012run Mar 9, 2009 | 2.57 |
"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 42-435-39173 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-435-39173 → 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/43539173, documented in the API reference.