WELL · 42-329-36221 · DISTRICT 8
Fasken 16-21 #4
Midland County · Spraberry (Trend Area) field · Producing · Vertical
Fasken 16-21 #4 (API 42-329-36221) is a well in Midland County operated by Diamondback E&P LLC, completed April 16, 2010 and listed as producing on the RRC schedule.
The RRC has issued 2 drilling permits between 2009 and 2018, permitted to 12,000 ft.
It was permitted by Endeavor Energy Resources L.P. and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Completion filings report 5 formation tops, including Spraberry, Dean, Wolfcamp, Strawn.
Its lease has reported 529K barrels of oil and 1.07M mcf of gas since May 2008, last reporting in July 2026. The lease carries 6 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Endeavor Energy Resources L.P.; the EWA schedule now lists a different operator.
Midland, TX · P-5 Y, filed Mar 4, 2026 · 5,237 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 | Endeavor Energy Resources L.P.Aug 1, 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
- 2
- permits on file
- Aug 1, 2018
- last permit issued
- Apr 16, 2010
- completed
- 529K
- cumulative oil, bbl
- 1.07M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2008 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 16, 2010
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
32.006435, -101.783535
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; they carry 6 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Fasken "16-21" O-10-38869 | Spraberry (Trend Area) | Diamondback E&P LLC | 6 | 529K | 1.07M | May 2008 – Jul 2026 |
Oil, barrels lease total
Last 12 months 6,645 · prior 12 12,379(-46%)
Gas, mcf lease total
Last 12 months 15,298 · prior 12 18,162(-16%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Endeavor Energy Resources L.P.May 2008 → Dec 2024
- 2Diamondback E&P LLCJan 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 838461-99 | Recompletion | Endeavor Energy Resources L.P. | Apr 5, 2018 | Aug 1, 2018 | — | 10,730 |
| 678894-99 | Drill | Endeavor Energy Resources L.P. | Feb 25, 2009 | Mar 9, 2009 | Jan 5, 2010 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-38869 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,634 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,003 | 10,242 | Perforated |
| 7,003 | 10,628 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 320 | 17.5 | 340 S |
| 8.625 | 4,779 | 11 | 500 S |
| 5.5 | 10,730 | 7.875 | 1,130 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 18, 2018 | Aug 15, 2018 | — |
| 00 | Nov 15, 2010 | Jul 14, 2010 | 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 42-329-36221 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-36221 → 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.
Fasken '16-21'42-329-36622
0.6 KM · Endeavor Energy Resources L.P. · Section with this well →
| Spraberry | 7,025 | -5,820 |
| Spraberyy (Trend Area) | 7,025 | -5,820 |
| Strawn | 10,275 | -9,070 |
| Atoka | 10,450 | -9,245 |
Fasken '16-21'42-329-36212
1.0 KM · Endeavor Energy Resources L.P. · Section with this well →
| Yates | 2,300 | 347 |
| Spraberry | 7,025 | -4,378 |
| Spraberry | 7,025 | -4,378 |
| Dean | 8,300 | -5,653 |
| Wolfcamp | 8,625 | -5,978 |
| Strawn | 10,275 | -7,628 |
| Atoka | 10,425 | -7,778 |
Weaver, Mae42-173-33042
1.1 KM · Endeavor Energy Resources L.P. · Section with this well →
| Spraberry | 6,970 | -4,338 |
| Spraberry | 6,970 | -4,338 |
| Spraberry | 7,462 | -4,830 |
| Dean | 8,282 | -5,650 |
| Strawn | 10,175 | -7,543 |
| Pennsylvanian | 10,218 | -7,586 |
| Atoka | 10,425 | -7,793 |
Weaver, May42-173-32982
1.3 KM · Stephens, Autry C. · Section with this well →
| Upper Spratberry | 6,985 | -4,347 |
| Spraberry | 6,985 | -4,347 |
| Spraberry | 7,487 | -4,849 |
| Dean | 8,281 | -5,643 |
| Strawn | 10,237 | -7,599 |
| Atoka | 10,375 | -7,737 |
Priddy-Fischer 1042-173-38258
1.4 KM · Pioneer Natural Res. USA, Inc. · Section with this well →
| Santa Rosa | 854 | 1,807 |
| Rustler | 1,447 | 1,214 |
| Yates | 2,249 | 412 |
| Seven Rivers | 2,454 | 207 |
| Queen | 3,108 | -447 |
| Grayburg | 3,620 | -959 |
| San Andres | 3,702 | -1,041 |
| Clear Fork | 5,897 | -3,236 |
10 TOPS · FIRST 8
Priddy-Fischer 1042-173-38259
1.4 KM · Pioneer Natural Res. USA, Inc. · Section with this well →
| Santa Rosa | 866 | 1,795 |
| Rustler | 1,448 | 1,213 |
| Yates | 2,244 | 417 |
| Seven Rivers | 2,459 | 202 |
| Queen | 3,109 | -448 |
| Grayburg | 3,645 | -984 |
| San Andres | 3,728 | -1,067 |
| Clear Fork | 5,912 | -3,251 |
10 TOPS · FIRST 8
Priddy-Fischer 1042-173-38260
1.4 KM · Pioneer Natural Res. USA, Inc. · Section with this well →
| Santa Rosa | 877 | 1,784 |
| Rustler | 1,447 | 1,214 |
| Yates | 2,254 | 407 |
| Seven Rivers | 2,452 | 209 |
| Queen | 3,112 | -451 |
| Grayburg | 3,631 | -970 |
| San Andres | 3,712 | -1,051 |
| Clear Fork | 5,903 | -3,242 |
10 TOPS · FIRST 8
Priddy-Fischer 1042-173-38261
1.4 KM · Pioneer Natural Res. USA, Inc. · Section with this well →
| Santa Rosa | 793 | 1,868 |
| Rustler | 1,446 | 1,215 |
| Yates | 2,239 | 422 |
| Seven Rivers | 2,452 | 209 |
| Queen | 3,125 | -464 |
| Grayburg | 3,635 | -974 |
| San Andres | 3,711 | -1,050 |
| Clear Fork | 5,891 | -3,230 |
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/32936221, documented in the API reference.