TEXAS · WELLS · GONZALES COUNTY · TURK-WILLIAMS SA B LEASE · API 42-177-34194 · DISTRICT 01

Turk-Williams SA B #4H

Gonzales County · Eagleville (Eagle Ford-1) field · Producing · Horizontal

Turk-Williams SA B #4H (API 42-177-34194) is a horizontal well in Gonzales County operated by Ensign Natural Resources II LLC, completed April 23, 2020 and listed as producing on the RRC schedule.

The RRC has issued one drilling permit, issued August 30, 2019, permitted to 11,415 ft.

It was permitted by Marathon Oil EF LLC and has since transferred to Ensign Natural Resources II LLC on the wellbore schedule.

Completion filings report 8 formation tops, including Wilcox, Austin Chalk, Eagle Ford, Buda.

Its lease has reported 320K barrels of oil and 460K mcf of gas since October 2019, last reporting volume in April 2026.

Operator of record

Ensign Natural Resources II LLC

Permitted by Marathon Oil EF LLC; the EWA schedule now lists a different operator.

Based in: Houston, TX
P-5 status: Active (A)
P-5 last filed: Jun 29, 2026
Permits on file: 13
Phone: (346) 809-4062

Create operator alert

SOURCE · RRC EWA WELLBORE SCHEDULE

What each RRC source says

Wellbore schedule	Ensign Natural Resources II LLC
Production reports	Marathon Oil EF LLCthrough Apr 2026
Latest permit	Marathon Oil EF LLCAug 30, 2019

The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.

11,415: total depth, ft
1: permits on file
Aug 30, 2019: last permit issued
Apr 23, 2020: completed
320K: cumulative oil, bbl
460K: cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · Jan 2020 THROUGH Apr 2026

Regulatory status · RRC wellbore file

Schedule: ON SCHEDULE
Completed: Apr 23, 2020
Shut in: —
Plugged: —

Operator's P-5 on the schedule: Active (A)

Surface location

29.406625, -97.286178 NAD27, as filed

29.406867, -97.286445 WGS84

Google Maps ↗

Permit surface location from the RRC GIS record, referenced to NAD27 as the RRC files it; the WGS84 pair is the same point through NOAA's NADCON grid, and the map link uses it, in Gonzales County.

Wells nearby

Withinmiles

Every well with a location on file around this well, in any state, nearest first.

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Texas locations come from drilling permits, so most older Texas wells have none and are not listed.

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
Turk-Williams SA B O-1-20005	Eagleville (Eagle Ford-1)	Marathon Oil EF LLC	1	320K	460K	Oct 2019 – Apr 2026

Oil, barrels lease total

Last 12 months 12,486 · prior 12 18,269(-32%)

Gas, mcf lease total

Last 12 months 25,899 · prior 12 39,435(-34%)

Chain of custody

Every operator that reported production on this well's lease, in order.

1Marathon Oil EF LLCJan 2020 → Apr 2026

Permits

Permit	Type	Operator	Received	Issued	Spud	Depth
856521-99	Drill	Marathon Oil EF LLC	Aug 23, 2019	Aug 30, 2019	Dec 28, 2019	22,000

Completions

Completed	Lease	Field	Operator	Status	Depth
Apr 23, 2020	Turk-Williams SA B O-1-20005	Eagleville (Eagle Ford-1)	Ensign Natural Resources II LLC	Producing	11,415

Formation tops

As filed on W-2/G-1. Subsea from 281 ft elevation.Download CSV →

Formation	MD ft	Subsea
WilcoxWILCOX - DISPOSAL	4,019	-3,738
WilcoxWILCOX - DISPOSAL	4,091	-3,810
Austin ChalkAUSTIN CHALK - H2S	10,670	-10,389
Eagle FordEAGLE FORD - H2S	11,217	-10,936
BudaBUDA - H2S, DISPOSAL	—	—
Carrizo	—	—
EdwardsEDWARDS - H2S	—	—
Navarro	—	—
Reklaw	—	—

Perforations

Perforated and open-hole intervals.

From	To	Type
11,340	18,121	Perforated

Casing

Strings as reported, shallowest first.

Casing in	Set at	Hole in	Cement
9.625	5,011	12.25	1,316 S
5.5	18,230	8.75	3,156 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 →

RRC record date	W-2 / G-1 date	Logs referenced
Jul 8, 2020	May 21, 2020	Yes
May 22, 2020	Feb 14, 2020	Yes
Apr 16, 2020	Dec 19, 2019	Yes

Well logs

2 logs loaded from the RRC's log index, 1 of them with a digital LAS file, the latest received Jan 26, 2023. 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 Wilcox, Austin Chalk, Eagle Ford	LAS + TIFF	5,435 to 18,324	Jan 26, 2023	2.25 + 5.08
Gamma RaySpans Wilcox, Austin Chalk, Eagle Ford	TIFF	5,435 to 18,234	Sep 26, 2022	13.3

"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.

Find logs withinmiles of this well:List →Map →

Search the well logs loaded into Petrora →

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 42-177-34194 → W-2, G-1, plugging reports, as PDFs
Completion packets for 42-177-34194 → scanned completion filings

The logs loaded for this well are under Well logs, with the RRC's log search for it.

Nearby wells and their tops

NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM

Draw a cross-section

This well's tops beside its 5 nearest neighbors, subsea-aligned so they line up regardless of surface terrain.

Open the cross-section →

Turk-Williams SA C42-177-34195

0.0 KM · Marathon Oil EF LLC · Section with this well →

Wilcox	4,019	-3,737
Austin Chalk	10,667	-10,385
Eagle Ford	11,243	-10,961
Reklaw	—
Carrizo	—
Edwards	—
Navarro	—
Buda	—

Turk-Williams SA A42-177-34193

0.0 KM · Marathon Oil EF LLC · Section with this well →

Wilcox	4,019	-3,738
Austin Chalk	10,634	-10,353
Eagle Ford	11,208	-10,927
Buda	—
Reklaw	—
Navarro	—
Edwards	—
Carrizo	—

Lefevre Unit42-177-34006

2.1 KM · EOG Resources, Inc. · Section with this well →

Reklaw	3,359	-3,030
Wilcox	3,948	-3,619
Carrizo	4,048	-3,719
Navarro	9,068	-8,739
Anacacho	10,870	-10,541
Austin Chalk	11,352	-11,023
Eagle Ford	11,743	-11,414
Edwards	—

9 TOPS · FIRST 8

Lefevre Unit42-177-34007

2.1 KM · EOG Resources, Inc. · Section with this well →

Reklaw	3,359	-3,030
Wilcox	3,948	-3,619
Carrizo	4,048	-3,719
Navarro	9,068	-8,739
Anacacho	10,885	-10,556
Austin Chalk	11,361	-11,032
Eagle Ford	11,756	-11,427
Edwards	—

9 TOPS · FIRST 8

Lefevre Unit42-177-34008

2.1 KM · EOG Resources, Inc. · Section with this well →

Reklaw	3,359	-3,030
Wilcox	3,948	-3,619
Carrizo	4,048	-3,719
Navarro	9,068	-8,739
Anacacho	10,951	-10,622
Austin Chalk	11,252	-10,923
Eagle Ford	11,771	-11,442
Edwards	—

9 TOPS · FIRST 8

Lefevre Unit42-177-34009

2.1 KM · EOG Resources, Inc. · Section with this well →

Reklaw	3,359	-3,030
Wilcox	3,948	-3,619
Carrizo	4,048	-3,719
Navarro	9,068	-8,739
Anacacho	10,984	-10,655
Austin Chalk	11,276	-10,947
Eagle Ford	11,810	-11,481
Buda	—

9 TOPS · FIRST 8

Bilsky Unit42-177-34389

2.5 KM · Marathon Oil EF LLC · Section with this well →

Reklaw	3,967	-3,662
Wilcox	4,527	-4,222
Austin Chalk	10,985	-10,680
Eagle Ford	11,597	-11,292
Edwards	—
Carrizo	—
Navarro	—
Buda	—

Bilsky Unit42-177-34388

2.5 KM · Marathon Oil EF LLC · Section with this well →

Reklaw	3,967	-3,662
Wilcox	4,527	-4,222
Austin Chalk	11,003	-10,698
Eagle Ford	11,609	-11,304
Navarro	—
Edwards	—
Buda	—
Carrizo	—

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/17734194, documented in the API reference.