WELL · 42-329-41722 · DISTRICT 8
Clark #401WB
Midland County · Spraberry (Trend Area) R 40 Exc field · Producing · Horizontal
Clark #401WB (API 42-329-41722) is a horizontal well in Midland County operated by Diamondback E&P LLC, completed October 27, 2017 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued June 1, 2017, permitted to 10,800 ft.
It was permitted by Lario Oil & Gas Company and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Completion filings report 10 formation tops, including Santa Rosa, Yates, Queen, Grayburg.
Its lease has reported 299K barrels of oil and 1.36M mcf of gas since October 2017, last reporting in July 2026.
Operator of record
Permitted by Lario Oil & Gas Company; the EWA schedule now lists a different operator.
Midland, TX · P-5 Y, filed Mar 4, 2026 · 5,231 permits on file · (855) 247-5920
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Diamondback E&P LLC |
| Production reports | Diamondback E&P LLCthrough Apr 2026 |
| Latest permit | Lario Oil & Gas CompanyJun 1, 2017 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,800
- total depth, ft
- 2
- permits on file
- Jun 1, 2017
- last permit issued
- Oct 27, 2017
- completed
- 299K
- cumulative oil, bbl
- 1.36M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2017 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Oct 27, 2017
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
31.728776, -101.885972
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 lease this well is completed on; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Clark O-10-51392 | Spraberry (Trend Area) R 40 Exc | Diamondback E&P LLC | 1 | 299K | 1.36M | Oct 2017 – Jul 2026 |
Gas, mcf lease total
Last 12 months 92,583 · prior 12 259,550(-64%)
Oil, barrels lease total
Last 12 months 5,298 · prior 12 2,547(+108%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Lario Oil & Gas CompanyOct 2017 → Jan 2023
- 2Diamondback E&P LLCJun 2023 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 826879-98 | Drill | Lario Oil & Gas Company | Aug 1, 2017 | Jun 1, 2017 | Jun 30, 2017 | 10,800 |
| 826879-99 | Drill | Lario Oil & Gas Company | May 17, 2017 | Jun 1, 2017 | Jun 30, 2017 | 10,800 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-51392 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,769 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Santa Rosa | 1,016 | 1,753 |
| Yates | 2,547 | 222 |
| Queen | 3,754 | -985 |
| Grayburg | 4,269 | -1,500 |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | 4,372 | -1,603 |
| Clear ForkCLEARFORK | 6,474 | -3,705 |
| Spraberry | 7,338 | -4,569 |
| Dean | 8,747 | -5,978 |
| Glorieta | — | — |
| Seven Rivers | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,923 | 19,503 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,630 | 17.5 | 1,325 S |
| 9.625 | 8,785 | 12.25 | 860 S |
| 5.5 | 19,560 | 6.75 | 1,265 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 | May 15, 2019 | Jan 22, 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 42-329-41722 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-41722 → 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.
Clark 442-329-42102
0.0 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 998 | 1,772 |
| Yates | 2,554 | 216 |
| Seven Rivers | 2,573 | 197 |
| Queen | 3,372 | -602 |
| Grayburg | 4,148 | -1,378 |
| San Andres | 4,457 | -1,687 |
| Glorieta | 5,653 | -2,883 |
| Clear Fork | 6,481 | -3,711 |
10 TOPS · FIRST 8
Clark 542-329-42281
0.0 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 998 | 1,772 |
| Yates | 2,548 | 222 |
| Seven Rivers | 2,567 | 203 |
| Queen | 3,374 | -604 |
| Grayburg | 4,181 | -1,411 |
| San Andres | 4,456 | -1,686 |
| Glorieta | 5,656 | -2,886 |
| Clear Fork | 6,481 | -3,711 |
10 TOPS · FIRST 8
Clark 742-329-43125
0.0 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 998 | 1,772 |
| Yates | 2,553 | 217 |
| Seven Rivers | 2,864 | -94 |
| Queen | 3,764 | -994 |
| Grayburg | 4,181 | -1,411 |
| San Andres | 4,442 | -1,672 |
| Glorieta | 5,652 | -2,882 |
| Clear Fork | 6,473 | -3,703 |
10 TOPS · FIRST 8
Clark 842-329-43126
0.0 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 998 | 1,772 |
| Yates | 2,554 | 216 |
| Seven Rivers | 2,887 | -117 |
| Queen | 3,760 | -990 |
| Grayburg | 4,176 | -1,406 |
| San Andres | 4,440 | -1,670 |
| Glorieta | 5,707 | -2,937 |
| Clear Fork | 6,530 | -3,760 |
10 TOPS · FIRST 8
Clark 642-329-42388
1.2 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 997 | 1,770 |
| Yates | 2,544 | 223 |
| Seven Rivers | 2,852 | -85 |
| Queen | 3,743 | -976 |
| Grayburg | 4,212 | -1,445 |
| San Andres | 4,412 | -1,645 |
| Glorieta | 5,605 | -2,838 |
| Clear Fork | 6,448 | -3,681 |
10 TOPS · FIRST 8
Clark 342-329-42297
1.2 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 997 | 1,770 |
| Yates | 2,544 | 223 |
| Seven Rivers | 2,855 | -88 |
| Queen | 3,744 | -977 |
| Grayburg | 4,209 | -1,442 |
| San Andres | 4,413 | -1,646 |
| Glorieta | 5,602 | -2,835 |
| Clear Fork | 6,453 | -3,686 |
11 TOPS · FIRST 8
Clark 242-329-42011
1.2 KM · Lario Oil & Gas Company · Section with this well →
| Santa Rosa | 997 | 1,772 |
| Yates | 2,503 | 266 |
| Seven Rivers | 2,518 | 251 |
| Queen | 3,736 | -967 |
| Grayburg | 4,132 | -1,363 |
| San Andres | 4,398 | -1,629 |
| Glorieta | 5,596 | -2,827 |
| Clear Fork | 6,444 | -3,675 |
10 TOPS · FIRST 8
Shackelford 14A42-329-43527
1.7 KM · Pioneer Natural Res. USA, Inc. · Section with this well →
| Santa Rosa | 1,035 | 1,760 |
| Rustler | 1,649 | 1,146 |
| Yates | 2,551 | 244 |
| Seven Rivers | 2,857 | -62 |
| Queen | 3,475 | -680 |
| Grayburg | 4,005 | -1,210 |
| San Andres | 4,279 | -1,484 |
| Clear Fork | 6,549 | -3,754 |
11 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/32941722, documented in the API reference.