TEXAS · WELLS · KARNES COUNTY · PFEIFER UNIT LEASE · API 42-255-32757 · DISTRICT 02
Pfeifer Unit #4H
Karnes County · Eagleville (Eagle Ford-2) field · Producing · Horizontal
Pfeifer Unit #4H (API 42-255-32757) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed February 5, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued November 8, 2012, permitted to 11,892 ft.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its lease has reported 683K barrels of oil and 1.31M mcf of gas since April 2011, last reporting volume in April 2026. The lease carries 4 wells, so these are lease totals, not this well alone.
Operator of record
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Sep 26, 2025
- Permits on file
- 3,191
- Phone
- (832) 486-2737
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Marathon Oil EF LLC |
| Production reports | Marathon Oil EF LLCthrough Apr 2026 |
| Latest permit | Marathon Oil EF LLCNov 8, 2012 |
- 11,892
- total depth, ft
- 1
- permits on file
- Nov 8, 2012
- last permit issued
- Feb 5, 2021
- completed
- 683K
- cumulative oil, bbl
- 1.31M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jul 2011 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Feb 5, 2021
- 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 lease this well is completed on; they carry 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Pfeifer Unit O-2-9817 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 4 | 683K | 1.31M | Apr 2011 – Apr 2026 |
Oil, barrels lease total
Last 12 months 3,716 · prior 12 11,470(-68%)
Gas, mcf lease total
Last 12 months 4,086 · prior 12 13,296(-69%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyJul 2011 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 747522-99 | Drill | Marathon Oil EF LLC | Sep 3, 2012 | Nov 8, 2012 | Nov 20, 2012 | 15,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Feb 5, 2021 | Pfeifer Unit O-2-9817 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | Producing | 11,892 |
Formation tops
As filed on W-2/G-1. Subsea from 476 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 11,260 | -10,784 |
| Austin Chalk | 11,403 | -10,927 |
| Eagle Ford | 11,597 | -11,121 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,963 | 16,745 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,943 | 12.25 | 1,750 S |
| 5.5 | 16,861 | 8.75 | 2,786 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 27, 2021 | Mar 16, 2021 | — |
| 00 | Sep 27, 2013 | Jul 30, 2013 | — |
| 00 | Apr 17, 2013 | Feb 14, 2013 | Yes |
Well logs
2 logs loaded from the RRC's log index, the latest received Mar 9, 2016. 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 |
|---|---|---|---|---|
| RESISTIVITYSpans Anacacho, Austin Chalk, Eagle Ford | TIFF | 5,943 to 16,806 | Mar 9, 2016run Dec 8, 2012 | 1.87 |
| RESISTIVITYSpans Anacacho, Austin Chalk, Eagle Ford | TIFF | 5,943 to 16,806 | Feb 23, 2016run Dec 8, 2012 | 0.57 |
"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 42-255-32757 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-32757 → 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/25532757, documented in the API reference.