WELL · 42-329-42021 · DISTRICT 8
Spanish Trail 3-10 HZ Unit #3571H
Midland County · Spraberry (Trend Area) field · Horizontal
Spanish Trail 3-10 HZ Unit #3571H (API 42-329-42021) is a horizontal well in Midland County operated by Cog Operating LLC, completed September 14, 2018.
The RRC has issued one drilling permit (amended twice), issued January 3, 2018, permitted to 12,000 ft.
Completion filings report 9 formation tops, including Santa Rosa, Yates, Seven Rivers, Queen.
Its 2 leases have reported 4.35M barrels of oil and 8.99M mcf of gas since December 2016, last reporting in July 2026. The leases carry 19 wells, so these are lease totals, not this well alone.
Operator of record
Midland, TX · P-5 Y, filed May 4, 2026 · 4,568 permits on file · (432) 853-2355
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | COG Operating LLCthrough Apr 2026 |
| Latest permit | RSP Permian, LLCJan 3, 2018 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 3
- permits on file
- Jan 3, 2018
- last permit issued
- Sep 14, 2018
- completed
- 4.35M
- cumulative oil, bbl
- 8.99M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2016 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Sep 14, 2018
- Shut in
- —
- Plugged
- —
Surface location
31.952140, -102.177397
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Midland County.
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 19 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Spanish Trail 3-10 A17 O-10-59555 | Spraberry (Trend Area) | COG Operating LLC | 1 | 23.6K | 81.7K | Apr 2023 – Jul 2026 |
| Spanish Trail 3-10 HZ Unit O-10-49132 | Spraberry (Trend Area) | COG Operating LLC | 18 | 4.33M | 8.91M | Dec 2016 – Dec 2023 |
Oil, barrels lease total
Last 12 months 7,768 · prior 12 7,165(+8%)
Gas, mcf lease total
Last 12 months 18,211 · prior 12 23,579(-23%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1RSP Permian, LLCDec 2016 → Jul 2018
- 2COG Operating LLCAug 2018 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 831691-97 | Drill | COG Operating LLC | Apr 3, 2023 | Jan 3, 2018 | Apr 5, 2018 | 12,000 |
| 831691-98 | Drill | COG Operating LLC | May 17, 2019 | Jan 3, 2018 | Apr 5, 2018 | 12,000 |
| 831691-99 | Drill | RSP Permian, LLC | Oct 5, 2017 | Jan 3, 2018 | Apr 5, 2018 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-49132 | — | — | — | — |
| — | — O-10-59555 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,891 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Santa Rosa | 1,081 | 1,810 |
| Yates | 2,931 | -40 |
| Seven Rivers | 3,901 | -1,010 |
| Queen | 4,663 | -1,772 |
| Grayburg | 4,793 | -1,902 |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | 5,193 | -2,302 |
| Glorieta | 6,043 | -3,152 |
| Clear ForkCLEARFORK | 7,184 | -4,293 |
| Spraberry | 8,063 | -5,172 |
| SpraberrySPRABERRY UPPER-DEAN | 9,321 | -6,430 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,020 | 16,491 | Perforated |
| 10,020 | 16,492 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,563 | 17.5 | 1,680 S |
| 9.625 | 9,000 | 12.25 | 667 S |
| 5.5 | 16,587 | 8.5 | 1,460 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 | Sep 21, 2023 | Sep 6, 2022 | Yes |
| 00 | May 24, 2019 | Jan 28, 2019 | Yes |
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 42-329-42021 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-42021 → 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.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well's tops beside its 5 nearest neighbours, subsea-aligned so they line up regardless of surface terrain.
Spanish Trail 3-10 HZ Unit42-329-42022
0.0 KM · RSP Permian, LLC · Section with this well →
| Santa Rosa | 1,555 | 1,335 |
| Yates | 2,552 | 338 |
| Queen | 3,122 | -232 |
| Seven Rivers | 3,522 | -632 |
| Grayburg | 4,305 | -1,415 |
| San Andres | 4,814 | -1,924 |
| Glorieta | 5,307 | -2,417 |
| Clear Fork | 7,198 | -4,308 |
10 TOPS · FIRST 8
Spanish Trail 3-10 A1642-329-41627
0.1 KM · RSP Permian, LLC · Section with this well →
| Santa Rosa | 1,800 | 1,091 |
| Yates | 2,863 | 28 |
| Seven Rivers | 3,763 | -872 |
| Queen | 3,954 | -1,063 |
| Grayburg | 4,450 | -1,559 |
| San Andres | 4,639 | -1,748 |
| Glorieta | 5,945 | -3,054 |
| Clear Fork | 7,213 | -4,322 |
15 TOPS · FIRST 8
Spanish Trail 3-10 A1542-329-41626
0.2 KM · RSP Permian, LLC · Section with this well →
| Santa Rosa | 1,794 | 1,097 |
| Yates | 2,872 | 19 |
| Seven Rivers | 3,822 | -931 |
| Queen | 3,954 | -1,063 |
| Grayburg | 4,450 | -1,559 |
| San Andres | 4,649 | -1,758 |
| Glorieta | 5,945 | -3,054 |
| Clear Fork | 7,219 | -4,328 |
10 TOPS · FIRST 8
Spanish Trail 3332H42-329-41484
0.2 KM · RSP Permian, LLC · Section with this well →
| Santa Rosa | 1,000 | 1,892 |
| Yates | 2,929 | -37 |
| Seven Rivers | 3,850 | -958 |
| Queen | 3,968 | -1,076 |
| Grayburg | 4,676 | -1,784 |
| San Andres | 4,900 | -2,008 |
| Glorieta | 5,650 | -2,758 |
| Clear Fork | 7,216 | -4,324 |
10 TOPS · FIRST 8
Spanish Trail42-329-43249
0.2 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 1,084 | 1,809 |
| Yates | 2,946 | -53 |
| Seven Rivers | 3,149 | -256 |
| Queen | 3,796 | -903 |
| Grayburg | 4,176 | -1,283 |
| San Andres | 4,695 | -1,802 |
| Glorieta | 5,510 | -2,617 |
| Clear Fork | 7,221 | -4,328 |
10 TOPS · FIRST 8
Spanish Trail42-329-43248
0.2 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 1,075 | 1,816 |
| Yates | 2,945 | -54 |
| Seven Rivers | 3,147 | -256 |
| Queen | 3,792 | -901 |
| Grayburg | 4,177 | -1,286 |
| San Andres | 4,698 | -1,807 |
| Glorieta | 5,509 | -2,618 |
| Clear Fork | 7,213 | -4,322 |
10 TOPS · FIRST 8
Spanish Trail42-329-43247
0.3 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 1,077 | 1,814 |
| Yates | 2,946 | -55 |
| Seven Rivers | 3,151 | -260 |
| Queen | 3,798 | -907 |
| Grayburg | 4,181 | -1,290 |
| San Andres | 4,707 | -1,816 |
| Glorieta | 5,521 | -2,630 |
| Clear Fork | 7,214 | -4,323 |
16 TOPS · FIRST 8
Spanish Trail 3-10 A1442-329-41625
0.5 KM · RSP Permian, LLC · Section with this well →
| Santa Rosa | 1,800 | 1,098 |
| Yates | 2,910 | -12 |
| Seven Rivers | 3,810 | -912 |
| Queen | 3,957 | -1,059 |
| Grayburg | 4,475 | -1,577 |
| San Andres | 4,674 | -1,776 |
| Glorieta | 5,948 | -3,050 |
| Clear Fork | 7,210 | -4,312 |
10 TOPS · FIRST 8
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/32942021, documented in the API reference.