WELL · 42-329-35313 · DISTRICT 8
Sandefer 37A #1
Midland County · Azalea (Devonian) field · Horizontal
Sandefer 37a #1 (API 42-329-35313) is a horizontal well in Midland County operated by Endeavor Energy Resources L.P., completed August 28, 2005.
The RRC has issued 2 drilling permits (amended once) between 2005 and 2009, permitted to 17,000 ft.
Completion filings report 5 formation tops, including Spraberry, Dean, Wolfcamp, Strawn.
Its 2 leases have reported 45.5K barrels of oil and 114K mcf of gas since April 2006, last reporting in July 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Endeavor Energy Resources L.P.
- Based in
- Midland, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jun 12, 2026
- Permits on file
- 6,190
- Phone
- (432) 221-7400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Endeavor Energy Resources L.P. |
| Production reports | Pioneer Natural Res. USA, Inc.through Jun 2021 |
| Latest permit | Endeavor Energy Resources L.P.Dec 17, 2009 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 17,000
- total depth, ft
- 3
- permits on file
- Dec 17, 2009
- last permit issued
- Aug 28, 2005
- completed
- 45.5K
- cumulative oil, bbl
- 114K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2006 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Aug 28, 2005
- Shut in
- —
- Plugged
- —
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Sandefur "37A" O-10-40158 | Spraberry (Trend Area) | Pioneer Natural Res. USA, Inc. | 1 | 37.2K | 58K | May 2010 – Jul 2026 |
| Sandefer "37A" O-10-37731 | Azalea (Devonian) | Endeavor Energy Resources L.P. | 1 | 8.31K | 56.2K | Apr 2006 – Oct 2016 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Endeavor Energy Resources L.P.Apr 2006 → Aug 2018
- 2DE3 Operating LLCSep 2018 → Jun 2020
- 3Pioneer Natural Res. USA, Inc.Jun 2021 → Jun 2021
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 688723-99 | Recompletion | Endeavor Energy Resources L.P. | Dec 16, 2009 | Dec 17, 2009 | Dec 14, 2009 | 12,000 |
| 602079-98 | Drill | Endeavor Energy Resources L.P. | Jun 24, 2005 | Jun 15, 2005 | Jul 2, 2005 | 17,000 |
| 602079-99 | Drill | Endeavor Energy Resources L.P. | Jun 15, 2005 | Jun 15, 2005 | — | 17,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-37731 | — | — | — | — |
| — | — O-10-40158 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,756 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,560 | 10,805 | Perforated |
| 13,650 | 15,223 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 307 | 17.5 | 300 S |
| 13.375 | 308 | 17.5 | 300 S |
| 9.625 | 5,209 | 12.25 | 550 S |
| 7 | 11,670 | 8.75 | 155 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 17, 2010 | Jun 16, 2010 | Yes |
| 00 | Oct 4, 2006 | May 3, 2006 | Yes |
| 00 | Jun 13, 2006 | — | — |
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 42-329-35313 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-35313 → 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.
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/32935313, documented in the API reference.