WELL · 42-489-30846 · DISTRICT 4
Sauz Ranch Mulatos Past. #185
Willacy County · Willamar West (Miocene 6050 N) field · Vertical
Sauz Ranch Mulatos Past. #185 (API 42-489-30846) is a well in Willacy County operated by Chestnut Explor. And Prod. Inc., completed October 16, 1989.
The RRC has issued 4 drilling permits between 1985 and 2013, permitted to 9,100 ft.
It was permitted by Flint Oak Energy, LLC and has since transferred to Chestnut Explor. And Prod. Inc. on the wellbore schedule.
Completion filings report one formation top, including Miocene (undifferentiated).
Its 3 leases have reported 99.6K barrels of oil and 78.7K mcf of gas since January 1993, last reporting in July 2026. The leases carry 6 wells, so these are lease totals, not this well alone.
It holds an active disposal or injection permit, with 345K barrels injected in the 12 months reported through May 2025.
Operator of record
Chestnut Explor. and Prod. Inc.
Permitted by Flint Oak Energy, LLC; the EWA schedule now lists a different operator.
Dallas, TX · P-5 Y, filed Sep 4, 2025 · 5 permits on file · (972) 342-7791
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Chestnut Explor. and Prod. Inc. |
| Production reports | Chestnut Explor. and Prod., Inc.through May 2017 |
| Latest permit | Flint Oak Energy, LLCSep 18, 2013 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,100
- total depth, ft
- 4
- permits on file
- Sep 18, 2013
- last permit issued
- Oct 16, 1989
- completed
- 99.6K
- cumulative oil, bbl
- 78.7K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Oct 16, 1989
- Shut in
- —
- Plugged
- —
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 3 leases this well is completed on; they carry 6 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Sauz Ranch Mulatos Pasture O-4-11735 | Willamar, West (Miocene 5500, N) | Chestnut Explor. and Prod., Inc. | 1 | 74.5K | 50.2K | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-13770 | Willamar, West (Miocene 5100) | Chestnut Explor. and Prod., Inc. | 3 | 25.1K | 28.5K | Jul 2012 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-14094 | Willamar, West (Miocene 5100) | Shoco Production LLC | 2 | 0 | 0 | Oct 2018 – Jul 2026 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Parker & Parsley Development L.PAug 1996 → Aug 1997
- 2Pioneer Natural Res. USA, Inc.Sep 1997 → Jun 1999
- 3Prize Operating CompanyJul 1999 → Mar 2002
- 4Gruy Petroleum Management Co.Apr 2002 → Apr 2006
- 5Cimarex Energy Co. of ColoradoMay 2006 → May 2011
- 6Flint Oak Energy, LLCJun 2011 → Jul 2014
- 7Chestnut Explor. and Prod., Inc.Aug 2014 → May 2017
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 769757-99 | Recompletion | Flint Oak Energy, LLC | Sep 10, 2013 | Sep 18, 2013 | Sep 29, 2012 | 8,100 |
| 366212-99 | Recompletion | Exxon Corp. | Nov 9, 1989 | Nov 14, 1989 | — | 9,100 |
| 362213-99 | Recompletion | Exxon Corp. | Aug 1, 1989 | Aug 7, 1989 | — | 9,100 |
| 264512-99 | Drill | Exxon Corp. | Jan 17, 1985 | Jan 18, 1985 | Mar 14, 1985 | 9,100 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-4-11735 | — | — | — | — |
| — | — O-4-13770 | — | — | — | — |
| — | — O-4-14094 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 17 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Miocene (undifferentiated)MIOCENE | 5,510 | -5,493 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,125 | 5,140 | Perforated |
| 5,255 | 5,270 | Perforated |
| 5,415 | 5,435 | Perforated |
| 5,510 | 5,530 | Perforated |
| 5,514 | 5,519 | Perforated |
| 6,060 | 6,064 | Perforated |
| 7,864 | 7,935 | Perforated |
| 7,890 | 7,926 | Perforated |
| 7,950 | 7,968 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,568 | 12.25 | 1,210 S |
| 5.5 | 8,095 | 7.875 | 1,078 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 | Aug 16, 2022 | Apr 7, 2022 | — |
| 00 | Jul 2, 2021 | Jun 21, 2021 | — |
| 00 | Mar 8, 2019 | Feb 26, 2019 | — |
| 00 | Nov 14, 2018 | Nov 25, 2013 | Yes |
| 00 | Jul 7, 2014 | Nov 25, 2013 | Yes |
| 00 | Jun 14, 1990 | Jan 22, 1990 | Yes |
| 00 | Mar 8, 1990 | — | — |
| 00 | Dec 6, 1989 | Nov 3, 1989 | Yes |
| 00 | Aug 15, 1986 | Jul 29, 1986 | — |
| 00 | Aug 6, 1986 | — | — |
| 00 | Jan 2, 1986 | Dec 12, 1985 | — |
| 00 | Dec 24, 1985 | — | — |
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 42-489-30846 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-489-30846 → 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.
Beyond the permit record
RRC UIC permits · H-10 reported volumes
Injection
- 345K
- bbl, last 12 reported months
- 3.37M
- bbl, all reported
- May 2025
- reported through
| UIC | Kind | Status | Permitted bbl/d | Max psi | Zone ft |
|---|---|---|---|---|---|
| 000059719 | H-1 Injection | Canceled Apr 17, 1991 | 1,500 | 1,800 | 7,864–7,935 |
| 000105747 | H-1 Injection | Active | 6,000 | 2,500 | 5,050–6,030 |
MONTHLY INJECTED, BBL · H-10 · LAST 24 REPORTED MONTHS
Last 12 months 344,882 · prior 12 378,471(-9%)
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/48930846, documented in the API reference.