WELL · 42-329-01189 · DISTRICT 8
Casbeer Unit #1
Midland County · Azalea (Devonian) field · Vertical
Casbeer Unit #1 (API 42-329-01189) is a well in Midland County operated by Mallard Exploration Inc., completed January 1, 1961.
The RRC has issued one drilling permit, issued October 26, 2010, permitted to 11,648 ft.
It was permitted by Endeavor Energy Resources L.P. and has since transferred to Mallard Exploration Inc. on the wellbore schedule.
Completion filings report 2 formation tops, including Spraberry, Strawn.
Its 2 leases have reported 63.1K barrels of oil and 208K mcf of gas since January 1993, last reporting in July 2026. The leases carry 2 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 May 14, 1982 · 18 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Mallard Exploration Inc. |
| Production reports | Diamondback E&P LLCthrough Apr 2026 |
| Latest permit | Endeavor Energy Resources L.P.Oct 26, 2010 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,648
- total depth, ft
- 1
- permits on file
- Oct 26, 2010
- last permit issued
- Jan 1, 1961
- completed
- 63.1K
- cumulative oil, bbl
- 208K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jan 1, 1961
- 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 |
|---|---|---|---|---|---|---|
| Casbeer Unit O-10-41262 | Spraberry (Trend Area) | Diamondback E&P LLC | 1 | 50.8K | 77.2K | Jun 2011 – Jul 2026 |
| Casbeer Unit O-10-24448 | Azalea (Devonian) | Endeavor Energy Resources L.P. | 1 | 12.3K | 131K | Jan 1993 – Mar 2012 |
Oil, barrels lease total
Last 12 months 2,142 · prior 12 2,285(-6%)
Gas, mcf lease total
Last 12 months 2,891 · prior 12 3,880(-25%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1O'Neill Properties, Ltd.Jan 1993 → Jul 1993
- 2V-F Petroleum Inc.Aug 1993 → Nov 2002
- 3QP, Inc.Dec 2002 → Apr 2010
- 4Endeavor Energy Resources L.P.May 2010 → Dec 2024
- 5Diamondback E&P LLCJan 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 704200-99 | Recompletion | Endeavor Energy Resources L.P. | Oct 22, 2010 | Oct 26, 2010 | Mar 3, 2011 | 11,648 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-24448 | — | — | — | — |
| — | — O-10-41262 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,712 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,217 | 10,752 | Perforated |
| 11,588 | 11,604 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 1,672 | 13.75 | 750 S |
| 10.75 | 1,672 | — | — |
| 7.625 | 9,387 | 9.875 | 500 S |
| 7.625 | 9,387 | — | — |
| 2 | 11,574 | — | — |
| 5.5 | — | — | — |
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 | Mar 8, 2012 | Jun 28, 2011 | Yes |
| 00 | Jan 12, 1984 | Apr 13, 1961 | — |
| 00 | Jan 12, 1984 | — | — |
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 42-329-01189 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-01189 → 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/32901189, documented in the API reference.