WELL · 42-317-42888 · DISTRICT 8
UL Cottonflat A #4101MS
Martin County · Spraberry (Trend Area) field · Producing · Horizontal
UL Cottonflat A #4101MS (API 42-317-42888) is a horizontal well in Martin County operated by Diamondback E&P LLC, completed January 16, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued February 10, 2020, permitted to 13,000 ft.
Completion filings report 13 formation tops, including Yates, Queen, Grayburg, San Andres.
Its lease has reported 289K barrels of oil and 453K mcf of gas since May 2020, last reporting in July 2026.
Operator of record
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 | Diamondback E&P LLCFeb 10, 2020 |
- 13,000
- total depth, ft
- 1
- permits on file
- Feb 10, 2020
- last permit issued
- Jan 16, 2021
- completed
- 289K
- cumulative oil, bbl
- 453K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2020 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 16, 2021
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
32.459661, -102.209398
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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| UL Cottonflat A O-10-55257 | Spraberry (Trend Area) | Diamondback E&P LLC | 1 | 289K | 453K | May 2020 – Jul 2026 |
Oil, barrels lease total
Last 12 months 29,176 · prior 12 38,069(-23%)
Gas, mcf lease total
Last 12 months 71,616 · prior 12 90,673(-21%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Diamondback E&P LLCJan 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 861527-99 | Drill | Diamondback E&P LLC | Jan 30, 2020 | Feb 10, 2020 | Feb 13, 2020 | 13,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-55257 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,935 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Yates | 2,994 | -59 |
| Queen | 3,660 | -725 |
| Grayburg | 4,061 | -1,126 |
| San AndresSAN ANDRES - ACTIVE CO2 FLOOD; H | 4,490 | -1,555 |
| Spraberry | 8,295 | -5,360 |
| Cisco | — | — |
| Dean | — | — |
| Devonian | — | — |
| Mississippian | — | — |
| Pennsylvanian | — | — |
| Santa Rosa | — | — |
| Strawn | — | — |
| Wolfcamp | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,111 | 22,059 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 455 | 17.5 | 600 S |
| 9.625 | 8,267 | 12.25 | 750 S |
| 5.5 | 22,153 | 8.5 | 4,005 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 | Dec 2, 2022 | May 23, 2022 | Yes |
| 00 | Oct 18, 2021 | Oct 11, 2021 | — |
| 00 | May 18, 2021 | May 5, 2021 | — |
| 00 | Jan 27, 2021 | Jan 7, 2021 | 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 42-317-42888 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-42888 → 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.
UL Cottonflat D42-317-42890
0.0 KM · Diamondback E&P LLC · Section with this well →
| Queen | — | |
| Cisco | — | |
| Pennsylvanian | — | |
| Yates | — | |
| Wolfcamp | — | |
| Spraberry | — | |
| Santa Rosa | — | |
| San Andres | — |
10 TOPS · FIRST 8
UL Cottonflat C42-317-42891
0.0 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,996 | -62 |
| Queen | 3,659 | -725 |
| Grayburg | 4,062 | -1,128 |
| San Andres | 4,491 | -1,557 |
| Spraberry | 8,291 | -5,357 |
| Dean | 9,541 | -6,607 |
| Wolfcamp | 9,744 | -6,810 |
| Cisco | — |
10 TOPS · FIRST 8
UL Cottonflat B42-317-42889
0.0 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,985 | -50 |
| Queen | 3,663 | -728 |
| Grayburg | 4,067 | -1,132 |
| San Andres | 4,491 | -1,556 |
| Spraberry | 8,298 | -5,363 |
| Santa Rosa | — | |
| Cisco | — | |
| Dean | — |
10 TOPS · FIRST 8
UL Cottonflat E42-317-42979
0.2 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,205 | -271 |
| Queen | 3,665 | -731 |
| Grayburg | 4,057 | -1,123 |
| San Andres | 4,478 | -1,544 |
| Glorieta | 5,588 | -2,654 |
| Clear Fork | 6,409 | -3,475 |
| Spraberry | 8,283 | -5,349 |
| Dean | — |
10 TOPS · FIRST 8
UL Cottonflat F42-317-42980
0.2 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,994 | -59 |
| Seven Rivers | 3,202 | -267 |
| Queen | 3,657 | -722 |
| Grayburg | 4,057 | -1,122 |
| San Andres | 4,477 | -1,542 |
| Glorieta | 5,588 | -2,653 |
| Spraberry | 8,285 | -5,350 |
| Santa Rosa | — |
12 TOPS · FIRST 8
UL Cottonflat G42-317-42981
0.2 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,989 | -55 |
| Seven Rivers | 3,206 | -272 |
| Queen | 3,655 | -721 |
| Grayburg | 4,055 | -1,121 |
| San Andres | 4,476 | -1,542 |
| Glorieta | 5,588 | -2,654 |
| Spraberry | 8,286 | -5,352 |
| Dean | 9,526 | -6,592 |
12 TOPS · FIRST 8
UL BLK 6 Ddu A42-003-47697
0.4 KM · Ajax Resources, LLC · Section with this well →
| Grayburg | 4,266 | -1,316 |
| San Andres | 4,782 | -1,832 |
| Clear Fork | 6,450 | -3,500 |
| Tubb | — | |
| Yates | — | |
| Holt | — | |
| Permian (undifferentiated) | — | |
| Queen | — |
10 TOPS · FIRST 8
UL BLK 6 Ddu A42-003-47696
0.4 KM · Ajax Resources, LLC · Section with this well →
| Grayburg | 4,266 | -1,316 |
| San Andres | 4,782 | -1,832 |
| Clear Fork | 6,455 | -3,505 |
| Glorieta | — | |
| Holt | — | |
| Permian (undifferentiated) | — | |
| Queen | — | |
| Seven Rivers | — |
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/31742888, documented in the API reference.