WELL · 42-317-42481 · DISTRICT 8
Dark Star Unit 2 #2166DH
Martin County · Spraberry (Trend Area) field · Producing · Horizontal
Dark Star Unit 2 #2166DH (API 42-317-42481) is a horizontal well in Martin County operated by Xto Energy Inc., completed July 27, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued August 22, 2019, permitted to 10,000 ft.
Completion filings report 10 formation tops, including Santa Rosa, Yates, Queen, Grayburg.
Its lease has reported 3.09M barrels of oil and 14M mcf of gas since December 2019, last reporting in July 2026. The lease carries 15 wells, so these are lease totals, not this well alone.
Operator of record
Spring, TX · P-5 Y, filed Feb 4, 2026 · 16,156 permits on file · (832) 625-1100
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | XTO Energy Inc. |
| Production reports | XTO Energy Inc.through Apr 2026 |
| Latest permit | XTO Energy Inc.Aug 22, 2019 |
- 10,000
- total depth, ft
- 2
- permits on file
- Aug 22, 2019
- last permit issued
- Jul 27, 2021
- completed
- 3.09M
- cumulative oil, bbl
- 14M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2019 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 27, 2021
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
32.272322, -101.764175
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Martin County.
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; they carry 15 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Dark Star Unit 2 O-10-54167 | Spraberry (Trend Area) | XTO Energy Inc. | 15 | 3.09M | 14M | Dec 2019 – Jul 2026 |
Gas, mcf lease total
Last 12 months 1,814,493 · prior 12 1,892,023(-4%)
Oil, barrels lease total
Last 12 months 86,223 · prior 12 172,452(-50%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1XTO Energy Inc.Apr 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 855619-98 | Drill | XTO Energy Inc. | Sep 2, 2020 | Aug 22, 2019 | Dec 25, 2019 | 10,000 |
| 855619-99 | Drill | XTO Energy Inc. | Jul 26, 2019 | Aug 22, 2019 | Dec 25, 2019 | 10,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-54167 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,592 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Santa Rosa | 840 | 1,752 |
| Santa Rosa | 843 | 1,749 |
| Yates | 2,067 | 525 |
| Yates | 2,084 | 508 |
| Queen | 3,167 | -575 |
| Queen | 3,202 | -610 |
| Grayburg | 3,426 | -834 |
| Grayburg | 3,443 | -851 |
| San AndresSAN ANDRES - ACTIVE CO2 FLOOD; H | 3,488 | -896 |
| San AndresSAN ANDRES - ACTIVE CO2 FLOOD; H | 3,505 | -913 |
| Spraberry | 6,601 | -4,009 |
| Spraberry | 6,605 | -4,013 |
| Dean | 8,150 | -5,558 |
| Dean | 8,167 | -5,575 |
| Wolfcamp | 8,350 | -5,758 |
| Cisco | — | — |
| Pennsylvanian | — | — |
| Wolfcamp | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,778 | 19,130 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,120 | 17.5 | 910 S |
| 9.625 | 7,357 | 12.25 | 2,131 S |
| 5.5 | 19,254 | 8.5 | 2,942 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 | Oct 19, 2021 | Oct 5, 2021 | Yes |
| 00 | Sep 29, 2020 | Sep 16, 2020 | 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 42-317-42481 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-42481 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. 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.
Dark Star Unit 242-317-42480
0.0 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 840 | 1,752 |
| Yates | 2,067 | 525 |
| Queen | 3,167 | -575 |
| Grayburg | 3,426 | -834 |
| San Andres | 3,488 | -896 |
| Spraberry | 6,605 | -4,013 |
| Dean | 8,167 | -5,575 |
| Wolfcamp | 8,350 | -5,758 |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42476
0.0 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 758 | 1,834 |
| Yates | 2,061 | 531 |
| Queen | 3,161 | -569 |
| Grayburg | 3,420 | -828 |
| San Andres | 3,482 | -890 |
| Spraberry | 6,599 | -4,007 |
| Dean | 8,146 | -5,554 |
| Wolfcamp | 8,344 | -5,752 |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42479
0.2 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 849 | 1,745 |
| San Andres | — | |
| Cisco | — | |
| Dean | — | |
| Grayburg | — | |
| Pennsylvanian | — | |
| Queen | — | |
| Spraberry | — |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42482
0.2 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 849 | 1,745 |
| Yates | 2,076 | 518 |
| Queen | 3,176 | -582 |
| Grayburg | 3,435 | -841 |
| San Andres | 3,497 | -903 |
| Spraberry | 6,612 | -4,018 |
| Dean | 8,157 | -5,563 |
| Wolfcamp | 8,358 | -5,764 |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42483
0.2 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 849 | 1,745 |
| Yates | 2,076 | 518 |
| Queen | 3,176 | -582 |
| Grayburg | 3,427 | -833 |
| San Andres | 3,482 | -888 |
| Spraberry | 6,608 | -4,014 |
| Dean | 8,176 | -5,582 |
| Wolfcamp | 8,359 | -5,765 |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42484
0.2 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 840 | 1,754 |
| Yates | 2,067 | 527 |
| Queen | 3,167 | -573 |
| Grayburg | 3,420 | -826 |
| San Andres | 3,482 | -888 |
| Spraberry | 6,605 | -4,011 |
| Dean | 8,167 | -5,573 |
| Wolfcamp | 8,350 | -5,756 |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42477
0.2 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 789 | 1,798 |
| Yates | 2,054 | 533 |
| Queen | 3,154 | -567 |
| Grayburg | 3,413 | -826 |
| San Andres | 3,475 | -888 |
| Spraberry | 6,592 | -4,005 |
| Dean | 8,154 | -5,567 |
| Wolfcamp | 8,337 | -5,750 |
10 TOPS · FIRST 8
Dark Star Unit 242-317-42478
0.2 KM · XTO Energy Inc. · Section with this well →
| Santa Rosa | 772 | 1,815 |
| Yates | 2,054 | 533 |
| Queen | 3,154 | -567 |
| Grayburg | 3,413 | -826 |
| San Andres | 3,475 | -888 |
| Spraberry | 6,592 | -4,005 |
| Dean | 8,154 | -5,567 |
| Wolfcamp | 8,337 | -5,750 |
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/31742481, documented in the API reference.