WELL · 42-157-31291 · DISTRICT 3
Losack #1
Fort Bend County · Moores Orchard (Yegua 2) field · Vertical
Losack #1 (API 42-157-31291) is a plugged well in Fort Bend County, plugged October 13, 2016, last operated by Mastodon Operating Company LLC.
The RRC has issued one drilling permit, issued December 31, 1981, permitted to 9,200 ft.
It was permitted by Partners Oil Company and has since transferred to Mastodon Operating Company LLC on the wellbore schedule.
Completion filings report 2 formation tops, including Yegua, Cook Mountain.
Operator of record
Mastodon Operating Company LLC
Permitted by Partners Oil Company; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed May 4, 2026 · (832) 722-8571
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Mastodon Operating Company LLC |
| Production reports | none |
| Latest permit | Partners Oil CompanyDec 31, 1981 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,200
- total depth, ft
- 1
- permits on file
- Dec 31, 1981
- last permit issued
- Feb 9, 1982
- completed
- 0
- cumulative oil, bbl
- 0
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 9, 1982
- Shut in
- —
- Plugged
- Oct 13, 2016
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 3 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Losack O-3-15496 | Moores Orchard (Yegua 2) | Mastodon Operating Company, LLC | 2 | 0 | 0 | Jan 1993 – Jul 2026 |
| Losack G-3-130862 | Moores Orchard (Cook Mountain) | Mastodon Operating Company, LLC | 1 | 0 | 0 | Jan 1993 – Oct 2016 |
No volumes reported on these leases in the last three years.
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 148161-99 | Drill | Partners Oil Company | Nov 28, 1984 | Dec 31, 1981 | — | 9,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-3-130862 | — | — | — | — |
| — | — O-3-15496 | — | — | — | — |
| — | — O-3-15496 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 125 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| YeguaYEGUA 1 | 8,082 | -7,957 |
| YeguaYEGUA 2 | 8,245 | -8,120 |
| YeguaYEGUA 3 | 8,354 | -8,229 |
| Cook Mountain | 8,939 | -8,814 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,245 | 8,251 | Perforated |
| 8,939 | 8,945 | Perforated |
| 8,954 | 8,957 | Perforated |
| 8,966 | 8,969 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 2,490 | 11 | 836 S |
| 2.375 | 8,849 | — | — |
| 5.5 | 9,100 | 7.875 | 500 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 | Mar 12, 2008 | Mar 2, 1982 | — |
| 00 | Jun 28, 1989 | May 30, 1989 | — |
| 00 | Jun 9, 1989 | — | — |
| 00 | Jan 12, 1984 | Mar 2, 1982 | — |
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 42-157-31291 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-157-31291 → 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/15731291, documented in the API reference.