WELL · 42-329-43465 · DISTRICT 8
Rio San Marcos 36-45 Unit 1A #144
Midland County · Spraberry (Trend Area) R 40 Exc field · Shut IN · Horizontal
Rio San Marcos 36-45 Unit 1a #144 (API 42-329-43465) is a horizontal well in Midland County operated by Diamondback E&P LLC, completed February 5, 2020 and listed as shut in on the RRC schedule.
The RRC has issued one drilling permit (amended twice), issued June 13, 2019, permitted to 11,000 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 9 formation tops, including Santa Rosa, Yates, Seven Rivers, Queen.
Its lease has reported 1.25M barrels of oil and 4.25M mcf of gas since February 2020, last reporting in July 2026. The lease carries 5 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.Jun 13, 2019 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,000
- total depth, ft
- 3
- permits on file
- Jun 13, 2019
- last permit issued
- Feb 5, 2020
- completed
- 1.25M
- cumulative oil, bbl
- 4.25M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Feb 2020 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Feb 5, 2020
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
31.789814, -102.003206
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 5 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Rio San Marcos 36-45 Unit 1A O-10-53693 | Spraberry (Trend Area) R 40 Exc | Diamondback E&P LLC | 5 | 1.25M | 4.25M | Feb 2020 – Jul 2026 |
Gas, mcf lease total
Last 12 months 832,959 · prior 12 681,394(+22%)
Oil, barrels lease total
Last 12 months 73,252 · prior 12 83,627(-12%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Endeavor Energy Resources L.P.Feb 2020 → Dec 2024
- 2Diamondback E&P LLCJan 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 854009-97 | Drill | Endeavor Energy Resources L.P. | Jun 30, 2020 | Jun 13, 2019 | Jul 21, 2019 | 9,000 |
| 854009-98 | Drill | Endeavor Energy Resources L.P. | Jul 16, 2019 | Jun 13, 2019 | Jul 21, 2019 | 8,500 |
| 854009-99 | Drill | Endeavor Energy Resources L.P. | Jun 7, 2019 | Jun 13, 2019 | Jul 21, 2019 | 11,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-53693 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,690 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Santa Rosa | 1,000 | 1,690 |
| Yates | 1,250 | 1,440 |
| Seven Rivers | 2,955 | -265 |
| Queen | 3,785 | -1,095 |
| Grayburg | 4,417 | -1,727 |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | 5,030 | -2,340 |
| Glorieta | 5,821 | -3,131 |
| Clear ForkCLEARFORK | 6,768 | -4,078 |
| Spraberry | 7,621 | -4,931 |
| SpraberrySPRABERRY UPPER-DEAN | 8,186 | -5,496 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,260 | 18,981 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,244 | 17.5 | 1,075 S |
| 9.625 | 6,990 | 12.25 | 1,750 S |
| 5.5 | 19,110 | 8.5 | 2,970 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 | Jul 23, 2020 | Jun 10, 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 42-329-43465 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-43465 → 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.
Rio San Marcos 36-45 Unit 1A42-329-43464
0.0 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,000 | 1,691 |
| Yates | 1,250 | 1,441 |
| Seven Rivers | 2,955 | -264 |
| Queen | 3,785 | -1,094 |
| Grayburg | 4,483 | -1,792 |
| San Andres | 4,520 | -1,829 |
| Glorieta | 5,217 | -2,526 |
| Clear Fork | 6,768 | -4,077 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 1A42-329-43463
0.0 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,000 | 1,690 |
| Yates | 1,250 | 1,440 |
| Seven Rivers | 2,955 | -265 |
| Queen | 3,785 | -1,095 |
| Grayburg | 4,417 | -1,727 |
| San Andres | 5,030 | -2,340 |
| Glorieta | 5,821 | -3,131 |
| Clear Fork | 6,768 | -4,078 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 1A42-329-43462
0.0 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,000 | 1,690 |
| Yates | 1,250 | 1,440 |
| Seven Rivers | 2,955 | -265 |
| Queen | 3,785 | -1,095 |
| Grayburg | 4,483 | -1,793 |
| San Andres | 4,520 | -1,830 |
| Glorieta | 5,217 | -2,527 |
| Clear Fork | 6,771 | -4,081 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 1A42-329-43461
0.0 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,000 | 1,691 |
| Yates | 1,250 | 1,441 |
| Seven Rivers | 2,955 | -264 |
| Queen | 3,785 | -1,094 |
| Grayburg | 4,483 | -1,792 |
| San Andres | 4,520 | -1,829 |
| Glorieta | 5,217 | -2,526 |
| Clear Fork | 6,759 | -4,068 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 142-329-41843
0.3 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,580 | 1,114 |
| Yates | 2,597 | 97 |
| Seven Rivers | 2,974 | -280 |
| Queen | 3,742 | -1,048 |
| Grayburg | 4,411 | -1,717 |
| San Andres | 5,035 | -2,341 |
| Glorieta | 5,812 | -3,118 |
| Clear Fork | 6,849 | -4,155 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 142-329-41842
0.3 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,580 | 1,114 |
| Yates | 2,597 | 97 |
| Seven Rivers | 2,974 | -280 |
| Queen | 3,742 | -1,048 |
| Grayburg | 4,411 | -1,717 |
| San Andres | 5,035 | -2,341 |
| Glorieta | 5,812 | -3,118 |
| Clear Fork | 6,849 | -4,155 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 142-329-41841
0.3 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,580 | 1,114 |
| Yates | 2,597 | 97 |
| Seven Rivers | 2,974 | -280 |
| Queen | 3,742 | -1,048 |
| Grayburg | 4,411 | -1,717 |
| San Andres | 5,035 | -2,341 |
| Glorieta | 5,812 | -3,118 |
| Clear Fork | 6,849 | -4,155 |
10 TOPS · FIRST 8
Rio San Marcos 36-45 Unit 142-329-41840
0.3 KM · Endeavor Energy Resources L.P. · Section with this well →
| Santa Rosa | 1,580 | 1,114 |
| Yates | 2,597 | 97 |
| Seven Rivers | 2,974 | -280 |
| Queen | 3,742 | -1,048 |
| Grayburg | 4,411 | -1,717 |
| San Andres | 5,035 | -2,341 |
| Glorieta | 5,812 | -3,118 |
| Clear Fork | 6,849 | -4,155 |
17 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/32943465, documented in the API reference.