TEXAS · WELLS · ZAVALA COUNTY · API 42-507-33023 · DISTRICT 01
Pfeiffer #1
Zavala County · Pearsall (Buda S.) field · Producing · Horizontal
Pfeiffer #1 (API 42-507-33023) is a horizontal well in Zavala County operated by Cml Exploration LLC, completed May 19, 2014 and listed as producing on the RRC schedule.
The RRC has issued 2 drilling permits (amended once) between 2013 and 2014, permitted to 6,941 ft.
Completion filings report 6 formation tops, including Escondido, Olmos, Elaine Sand, Anacacho.
Its 2 leases have reported 41.2K barrels of oil and 12.6K mcf of gas since November 2013, last reporting volume in April 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
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 Apr 2026 |
| Latest permit | CML Exploration, LLCApr 10, 2014 |
- 6,941
- total depth, ft
- 3
- permits on file
- Apr 10, 2014
- last permit issued
- May 19, 2014
- completed
- 41.2K
- cumulative oil, bbl
- 12.6K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 2013 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 19, 2014
- Shut in
- —
- 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 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 |
|---|---|---|---|---|---|---|
| Pfeiffer O-1-18081 | Pearsall (Buda, S.) | CML Exploration, LLC | 1 | 39.6K | 12.6K | May 2014 – Apr 2026 |
| Pfeiffer O-1-17729 | Pearsall (Austin Chalk) | CML Exploration, LLC | 1 | 1.59K | 0 | Nov 2013 – Feb 2014 |
Oil, barrels lease total
Last 12 months 2,055 · prior 12 2,444(-16%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1CML Exploration, LLCNov 2013 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 781530-99 | Recompletion | CML Exploration, LLC | Mar 6, 2014 | Apr 10, 2014 | Apr 17, 2014 | 7,200 |
| 765803-98 | Drill | CML Exploration, LLC | Dec 13, 2013 | Jul 9, 2013 | Sep 22, 2013 | 6,700 |
| 765803-99 | Drill | CML Exploration, LLC | Jul 1, 2013 | Jul 9, 2013 | Sep 22, 2013 | 6,700 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| May 19, 2014 | Pfeiffer O-1-18081 | Pearsall (Buda S.) | CML Exploration LLC | Producing | 6,941 |
| Nov 25, 2013 | Pfeiffer O-1-17729 | Pearsall (Austin Chalk) | CML Exploration LLC | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 614 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| EscondidoESCONDIDO - DISPOSAL | 2,846 | -2,232 |
| Olmos | 3,901 | -3,287 |
| Elaine Sand | 4,880 | -4,266 |
| Anacacho | 5,309 | -4,695 |
| Austin Chalk | 5,765 | -5,151 |
| Buda | 6,940 | -6,326 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,611 | 7,327 | Open hole |
| 5,611 | 10,273 | Open hole |
| 5,611 | 10,528 | Open hole |
| 5,611 | 12,147 | Open hole |
| 5,611 | 12,418 | Open hole |
| 5,611 | 13,320 | Open hole |
| 5,611 | 13,442 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 2,575 | 12.25 | 955 S |
| 7 | 5,611 | 8.75 | 625 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 | Oct 13, 2016 | Oct 4, 2016 | — |
| 00 | Feb 11, 2015 | Sep 18, 2014 | — |
| 00 | Aug 19, 2014 | Feb 4, 2014 | Yes |
Well logs
1 log loaded from the RRC's log index, 1 of it with a digital LAS file, the latest received Feb 21, 2017. 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, Elaine Sand, Anacacho | LAS + TIFF | 2,575 to 5,602 | Feb 21, 2017 | 0.76 + 5.13 |
"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 42-507-33023 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-507-33023 → 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/50733023, documented in the API reference.