TEXAS · WELLS · GONZALES COUNTY · BARNHART (EF) LEASE · API 42-177-33040 · DISTRICT 01
Barnhart (EF) #37H
Gonzales County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Barnhart (EF) #37H (API 42-177-33040) is a horizontal well in Gonzales County operated by Ensign Natural Resources II LLC, completed February 27, 2024 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended twice), issued July 5, 2013, permitted to 10,927 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 9 formation tops, including Carrizo, Reklaw, Wilcox, Buda.
Its lease has reported 15M barrels of oil and 18.4M mcf of gas since November 2010, last reporting volume in April 2026. The lease carries 60 wells, so these are lease totals, not this well alone.
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
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 LLCJul 5, 2013 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,927
- total depth, ft
- 3
- permits on file
- Jul 5, 2013
- last permit issued
- Feb 27, 2024
- completed
- 15M
- cumulative oil, bbl
- 18.4M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2010 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Feb 27, 2024
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 60 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Barnhart (EF) O-1-15397 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 60 | 15M | 18.4M | Nov 2010 – Apr 2026 |
Oil, barrels lease total
Last 12 months 1,174,908 · prior 12 1,325,612(-11%)
Gas, mcf lease total
Last 12 months 1,401,133 · prior 12 1,796,482(-22%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Hilcorp Energy CompanyDec 2010 → Oct 2011
- 2Marathon Oil EF LLCNov 2011 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 765788-97 | Drill | Marathon Oil EF LLC | Dec 16, 2013 | Jul 5, 2013 | Apr 30, 2014 | 16,800 |
| 765788-98 | Drill | Marathon Oil EF LLC | Oct 28, 2013 | Jul 5, 2013 | — | 16,800 |
| 765788-99 | Drill | Marathon Oil EF LLC | Jul 1, 2013 | Jul 5, 2013 | — | 16,800 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Feb 27, 2024 | Barnhart (EF) O-1-15397 | Eagleville (Eagle Ford-1) | Ensign Natural Resources II LLC | Producing | 10,927 |
Formation tops
As filed on W-2/G-1. Subsea from 217 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Carrizo | 1,390 | -1,173 |
| Reklaw | 1,860 | -1,643 |
| WilcoxWILCOX - DISPOSAL | 2,170 | -1,953 |
| BudaBUDA - H2S, DISPOSAL | 4,440 | -4,223 |
| Navarro | 5,920 | -5,703 |
| EdwardsEDWARDS - H2S | 9,310 | -9,093 |
| Anacacho | 10,447 | -10,230 |
| Austin Chalk | 10,550 | -10,333 |
| Austin ChalkAUSTIN CHALK - H2S | 10,550 | -10,333 |
| Eagle Ford | 11,343 | -11,126 |
| Eagle FordEAGLE FORD - H2S | 11,343 | -11,126 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,773 | 16,484 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 2,675 | 12.25 | 854 S |
| 5.5 | 16,625 | 8.5 | 2,598 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 6, 2024 | Apr 22, 2024 | — |
| 00 | Jan 21, 2022 | Jan 4, 2022 | — |
| 00 | Aug 26, 2016 | Aug 19, 2016 | — |
| 00 | Aug 22, 2016 | Aug 19, 2016 | Yes |
| 00 | Sep 15, 2014 | Jul 3, 2014 | Yes |
| 00 | Aug 20, 2014 | Jun 17, 2014 | Yes |
Well logs
2 logs loaded from the RRC's log index, 2 of them with a digital LAS file, the latest received May 16, 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 Wilcox, Buda, Navarro, Edwards, Anacacho, Austin Chalk, Eagle Ford | LAS + TIFF | 2,675 to 16,580 | May 16, 2017 | 0.43 + 17.1 |
| Gamma RaySpans Wilcox, Buda, Navarro, Edwards, Anacacho, Austin Chalk, Eagle Ford | LAS + TIFF | 2,675 to 16,580 | Mar 1, 2017 | 0.43 + 4.37 |
"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 42-177-33040 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-177-33040 → 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/17733040, documented in the API reference.