TEXAS · WELLS · ANDREWS COUNTY · BIG MAX 23 SW LEASE · API 42-003-42888 · DISTRICT 7B
Big Max 23 SW #11
Andrews County · Spraberry (Trend Area) field · Producing · Vertical
- Fields on the latest permit · any of 2
- Lowe, West (Strawn) · Spraberry (Trend Area)
- Not one formation; the well must be completed in one of them, and no target formation is stated. The district's wildcat field is also on the permit.
Big Max 23 SW #11 (API 42-003-42888) is a well in Andrews County operated by Sabalo II Operating LLC, completed August 26, 2011 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued May 6, 2011, permitted to 10,925 ft.
It was permitted by Windsor Permian LLC and has since transferred to Sabalo II Operating LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Clear Fork, Spraberry, Strawn.
Its lease has reported 31.9K barrels of oil and 41.1K mcf of gas since August 2011, last reporting volume in April 2026.
Operator of record
Permitted by Windsor Permian LLC; the EWA schedule now lists a different operator.
- Based in
- Corpus Chrsti, TX
- P-5 status
- Active (A)
- P-5 last filed
- Feb 25, 2026
- Permits on file
- 73
- Phone
- (361) 888-7708
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Sabalo II Operating LLC |
| Production reports | Sabalo II Operating, LLCthrough Apr 2026 |
| Latest permit | Windsor Permian LLCMay 6, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,925
- total depth, ft
- 1
- permits on file
- May 6, 2011
- last permit issued
- Aug 26, 2011
- completed
- 31.9K
- cumulative oil, bbl
- 41.1K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Sep 2011 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 26, 2011
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 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 |
|---|---|---|---|---|---|---|
| Big Max 23 SW O-10-42220 | Spraberry (Trend Area) | Sabalo II Operating, LLC | 1 | 31.9K | 41.1K | Aug 2011 – Apr 2026 |
Oil, barrels lease total
Last 12 months 273 · prior 12 250(+9%)
Gas, mcf lease total
Last 12 months 437 · prior 12 291(+50%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Windsor Permian LLCSep 2011 → Jun 2012
- 2Diamondback E&P LLCJul 2012 → Sep 2024
- 3Sabalo II Operating, LLCOct 2024 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 715526-99 | Drill | Windsor Permian LLC | May 3, 2011 | May 6, 2011 | Jun 26, 2011 | 11,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 26, 2011 | Big Max 23 SW O-10-42220 | Spraberry (Trend Area) | Sabalo II Operating LLC | Producing | 10,925 |
Formation tops
As filed on W-2/G-1. Subsea from 3,096 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Clear ForkCLEARFORK | 7,212 | -4,116 |
| SpraberryUPPER SPRABERRY | 8,564 | -5,468 |
| Strawn | 10,631 | -7,535 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,200 | 10,787 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 11.75 | 1,774 | 14.75 | 1,100 S |
| 8.625 | 5,220 | 11 | 700 S |
| 5.5 | 10,925 | 7.875 | 1,160 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Feb 5, 2013 | Feb 16, 2012 | Yes |
Well logs
2 logs loaded from the RRC's log index, the latest received Sep 29, 2014. Density, Neutron. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| NEUTRON/DENSITY POROSITYSpans Clear Fork, Spraberry, Strawn | TIFF | 100 to 10,876 | Sep 29, 2014run Jul 11, 2011 | 8.49 |
| NEUTRON/DENSITY POROSITYSpans Clear Fork, Spraberry, Strawn | TIFF | 100 to 10,876 | Jul 11, 2014run Jul 11, 2011 | 8.11 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-003-42888 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-003-42888 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it. The University Lands library has no per-well link: then paste it into its 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/00342888, documented in the API reference.