TEXAS · WELLS · KARNES COUNTY · SIENKIEWICS UNIT LEASE · API 42-255-31775 · DISTRICT 02
Sienkiewics Unit #1H
Karnes County · Sugarkane (Eagle Ford) field · Temp Abandoned · Horizontal
- Fields on the latest permit · any of 2
- Eagleville (Eagle Ford) · Sugarkane (Eagle Ford)
- Not one formation; the well must be completed in one of them, and no target formation is stated.
Sienkiewics Unit #1H (API 42-255-31775) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed December 18, 2010 and listed as temp abandoned on the RRC schedule, shut in December 1, 2024.
The RRC has issued one drilling permit, issued October 22, 2010, permitted to 12,705 ft.
It was permitted by Hilcorp Energy Company and has since transferred to Marathon Oil EF LLC on the wellbore schedule.
Completion filings report 5 formation tops, including Anacacho, Pecan Gap, Austin Chalk, Upper Ef.
Its lease has reported 364K barrels of oil and 1.33M mcf of gas since December 2010, last reporting volume in November 2024.
Operator of record
Permitted by Hilcorp Energy Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Oct 13, 2026
- 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 Nov 2024 |
| Latest permit | Hilcorp Energy CompanyOct 22, 2010 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,705
- total depth, ft
- 1
- permits on file
- Oct 22, 2010
- last permit issued
- Dec 18, 2010
- completed
- 364K
- cumulative oil, bbl
- 1.33M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · JAN 2011 THROUGH NOV 2024
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 18, 2010
- Shut in
- Dec 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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH AUG 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 |
|---|---|---|---|---|---|---|
| Sienkiewics Unit G-2-262109 | Sugarkane (Eagle Ford) | Marathon Oil EF LLC | 1 | 364K | 1.33M | Dec 2010 – Nov 2024 |
Gas, mcf lease total
Last 12 months 0 · prior 12 3,500(-100%)
Wells named Sienkiewics Unit
Marathon Oil EF LLC's other wells filed under this lease name in Karnes County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyJan 2011 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Nov 2024
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 704063-99 | Drill | Hilcorp Energy Company | Oct 20, 2010 | Oct 22, 2010 | Nov 16, 2010 | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 18, 2010 | Sienkiewics Unit G-2-262109 | Sugarkane (Eagle Ford) | Marathon Oil EF LLC | Temp Abandoned · shut in Dec 1, 2024 | 12,705 |
Formation tops
As filed on W-2/G-1. Subsea from 318 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 12,126 | -11,808 |
| Anacacho | 12,140 | -11,822 |
| Pecan Gap | 12,211 | -11,893 |
| Pecan Gap | 12,224 | -11,906 |
| Austin Chalk | 12,251 | -11,933 |
| Austin Chalk | 12,268 | -11,950 |
| Upper EF | 12,433 | -12,115 |
| Eagle Ford | 12,461 | -12,143 |
| Eagle Ford | 12,472 | -12,154 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,600 | 18,190 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 5,894 | 12.5 | 2,335 S |
| 5.5 | 18,315 | 8.25 | 2,989 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 | Aug 28, 2012 | Apr 4, 2012 | Yes |
| 00 | Feb 9, 2012 | May 16, 2011 | Yes |
Well logs
1 log loaded from the RRC's log index, 1 of it with a digital LAS file, the latest received Sep 27, 2017. Gamma ray. 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 |
|---|---|---|---|---|
| Gamma RaySpans Anacacho, Pecan Gap, Austin Chalk, Upper Ef, Eagle Ford | LAS + TIFF | 5,886 to 18,315 | Sep 27, 2017 | 0.45 + 8.97 |
"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 42-255-31775 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-31775 → 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/25531775, documented in the API reference.