TEXAS · WELLS · ZAVALA COUNTY · PRESTON LEASE · API 42-507-33251 · DISTRICT 01
Preston #1
Zavala County · Pearsall (Buda S.) field · Shut In · Horizontal
Preston #1 (API 42-507-33251) is a horizontal well in Zavala County operated by Cml Exploration LLC, completed January 6, 2016 and listed as shut in on the RRC schedule, shut in March 1, 2024.
The RRC has issued one drilling permit (amended once), issued August 17, 2015, permitted to 6,775 ft.
Completion filings report 6 formation tops, including Escondido, Olmos, Anacacho, Austin Chalk.
Its lease has reported 32.5K barrels of oil and 290K mcf of gas since January 2016, last reporting volume in February 2024.
Operator of record
- Based in
- Austin, TX
- P-5 status
- Active (A)
- P-5 last filed
- Oct 20, 2025
- Permits on file
- 514
- Phone
- (512) 328-8085
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | CML Exploration LLC |
| Production reports | CML Exploration, LLCthrough Feb 2024 |
| Latest permit | CML Exploration, LLCAug 17, 2015 |
- 6,775
- total depth, ft
- 2
- permits on file
- Aug 17, 2015
- last permit issued
- Jan 6, 2016
- completed
- 32.5K
- cumulative oil, bbl
- 290K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 2016 THROUGH Feb 2024
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 6, 2016
- Shut in
- Mar 1, 2024
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
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 |
|---|---|---|---|---|---|---|
| Preston O-1-18755 | Pearsall (Buda, S.) | CML Exploration, LLC | 1 | 32.5K | 290K | Jan 2016 – Feb 2024 |
Oil, barrels lease total
Last 12 months 0 · prior 12 0
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1CML Exploration, LLCJan 2016 → Feb 2024
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 809283-98 | Drill | CML Exploration, LLC | Jan 12, 2016 | Aug 17, 2015 | Nov 21, 2015 | 7,500 |
| 809283-99 | Drill | CML Exploration, LLC | Aug 10, 2015 | Aug 17, 2015 | Nov 21, 2015 | 7,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 6, 2016 | Preston O-1-18755 | Pearsall (Buda S.) | CML Exploration LLC | Shut In · shut in Mar 1, 2024 | 6,775 |
Formation tops
As filed on W-2/G-1. Subsea from 589 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| EscondidoESCONDIDO - DISPOSAL | 2,562 | -1,973 |
| Olmos | 3,567 | -2,978 |
| Anacacho | 5,043 | -4,454 |
| Austin Chalk | 5,502 | -4,913 |
| Eagle Ford | 6,239 | -5,650 |
| PearsallPEARSALL (BUDA, S.) | 6,566 | -5,977 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,804 | 14,053 | Open hole |
| 6,804 | 14,260 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,340 | 12.25 | 889 S |
| 7 | 6,804 | 8.75 | 280 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 | May 13, 2016 | Feb 4, 2016 | Yes |
Well logs
1 log loaded from the RRC's log index, the latest received Nov 16, 2018. Resistivity. 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 |
|---|---|---|---|---|
| InductionSpans Escondido, Olmos, Anacacho | TIFF | 200 to 5,338 | Nov 16, 2018 | 13.8 |
"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 42-507-33251 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-507-33251 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it.
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/50733251, documented in the API reference.