WELL · 42-013-36072 · DISTRICT 1
4K Black Hills Unit B #1H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
4k Black Hills Unit B #1H (API 42-013-36072) is a horizontal well in Atascosa County operated by Trailblazer Energy Resources LLC, completed December 3, 2024 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued August 30, 2023, permitted to 9,000 ft.
It was permitted by Pillar Efs, LLC and has since transferred to Trailblazer Energy Resources LLC on the wellbore schedule.
Completion filings report 10 formation tops, including Reklaw, Carrizo, Wilcox, Navarro.
Its lease has reported 158K barrels of oil and 71.7K mcf of gas since December 2024, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Trailblazer Energy Resources LLC
Permitted by Pillar Efs, LLC; the EWA schedule now lists a different operator.
Tulsa, OK · P-5 Y, filed Aug 4, 2025 · 30 permits on file · (866) 598-1407
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Trailblazer Energy Resources LLC |
| Production reports | Trailblazer Energy Resources,llcthrough Apr 2026 |
| Latest permit | Pillar Efs, LLCAug 30, 2023 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,000
- total depth, ft
- 2
- permits on file
- Aug 30, 2023
- last permit issued
- Dec 3, 2024
- completed
- 158K
- cumulative oil, bbl
- 71.7K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2024 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 3, 2024
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
Surface location
28.950313, -98.300604
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Atascosa County.
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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| 4K Black Hills Unit B O-1-21646 | Eagleville (Eagle Ford-1) | Trailblazer Energy Resources,llc | 2 | 158K | 71.7K | Dec 2024 – Jul 2026 |
Oil, barrels lease total
Last 12 months 75,540 · prior 12 82,496(-8%)
Gas, mcf lease total
Last 12 months 34,796 · prior 12 36,945(-6%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Pillar Efs, LLCDec 2024 → Jan 2026
- 2Trailblazer Energy Resources,llcFeb 2026 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 893160-98 | Drill | Pillar Efs, LLC | Nov 5, 2024 | Aug 30, 2023 | Aug 31, 2024 | 9,000 |
| 893160-99 | Drill | Pillar Efs, LLC | Aug 22, 2023 | Aug 30, 2023 | Aug 31, 2024 | 9,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-21646 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 350 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Reklaw | 1,793 | -1,443 |
| Carrizo | 1,963 | -1,613 |
| WilcoxWILCOX - DISPOSAL | 2,955 | -2,605 |
| NavarroNAVARRO - H2S | 5,621 | -5,271 |
| OlmosOLMOS - DISPOSAL | 6,251 | -5,901 |
| AnacachoANACACHO - H2S | 7,491 | -7,141 |
| Austin ChalkAUSTIN CHALK - H2S, DISPOSAL | 7,700 | -7,350 |
| Bartosh | — | — |
| EscondidoESCONDIDO - H2S, DISPOSAL | — | — |
| Queen City | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,375 | 15,482 | Perforated |
| 15,623 | 16,076 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 4,826 | 12.25 | 1,301 S |
| 5.5 | 16,095 | 8.75 | 3,219 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. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Mar 6, 2025 | Feb 3, 2025 | Yes |
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 42-013-36072 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-36072 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.
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 neighbours, subsea-aligned so they line up regardless of surface terrain.
4K Black Hills Unit B42-013-36073
0.0 KM · Pillar Efs, LLC · Section with this well →
| Queen City | 1,143 | -793 |
| Reklaw | 1,834 | -1,484 |
| Carrizo | 2,003 | -1,653 |
| Wilcox | 2,991 | -2,641 |
| Navarro | 5,646 | -5,296 |
| Olmos | 6,216 | -5,866 |
| Anacacho | 7,466 | -7,116 |
| Austin Chalk | 7,669 | -7,319 |
10 TOPS · FIRST 8
4K Black Hills Unit A42-013-36071
0.0 KM · Pillar Efs, LLC · Section with this well →
| Wilcox | 2,964 | -2,615 |
| Navarro | 5,606 | -5,257 |
| Olmos | 6,254 | -5,905 |
| Anacacho | 7,562 | -7,213 |
| Austin Chalk | 7,775 | -7,426 |
| Queen City | — | |
| Escondido | — | |
| Carrizo | — |
10 TOPS · FIRST 8
Foreigner 19H42-013-35984
3.7 KM · Trinity Operating (Usg), LLC · Section with this well →
| Anacacho | 7,789 | -7,453 |
| Austin Chalk | 7,993 | -7,657 |
| Carrizo | — | |
| Wilcox | — | |
| Reklaw | — | |
| Queen City | — | |
| Olmos | — | |
| Bartosh | — |
10 TOPS · FIRST 8
Foreigner 21H42-013-35986
3.7 KM · Trinity Operating (Usg), LLC · Section with this well →
| Escondido | 6,131 | -5,795 |
| Olmos | 6,832 | -6,496 |
| Eagle Ford | 8,380 | -8,044 |
| Anacacho | — | |
| Austin Chalk | — | |
| Bartosh | — | |
| Carrizo | — | |
| Navarro | — |
11 TOPS · FIRST 8
Foreigner 20H42-013-35985
3.7 KM · Trinity Operating (Usg), LLC · Section with this well →
| Midway | 5,195 | -4,859 |
| Escondido | 6,108 | -5,772 |
| Olmos | 6,827 | -6,491 |
| Anacacho | 7,844 | -7,508 |
| Austin Chalk | 8,008 | -7,672 |
| Navarro | — | |
| Queen City | — | |
| Reklaw | — |
11 TOPS · FIRST 8
The Eagles 18H42-013-35990
4.2 KM · Trinity Operating (Usg), LLC · Section with this well →
| Midway | 5,142 | -4,796 |
| Escondido | 6,162 | -5,816 |
| San Miguel | 6,703 | -6,357 |
| Olmos | 6,703 | -6,357 |
| Anacacho | 7,776 | -7,430 |
| Bartosh | — | |
| Carrizo | — | |
| Navarro | — |
11 TOPS · FIRST 8
The Eagles 17H42-013-35989
4.2 KM · Trinity Operating (Usg), LLC · Section with this well →
| Escondido | 6,037 | -5,700 |
| Olmos | 6,738 | -6,401 |
| Anacacho | 7,777 | -7,440 |
| Austin Chalk | 7,936 | -7,599 |
| Eagle Ford | 8,234 | -7,897 |
| Eagle Ford | 8,269 | -7,932 |
| Carrizo | — | |
| Wilcox | — |
12 TOPS · FIRST 8
Acdc42-013-36047
4.3 KM · Trinity Operating (Usg), LLC · Section with this well →
| Eagle Ford | 8,430 | -8,109 |
| Eagle Ford | 8,510 | -8,189 |
| Anacacho | — | |
| Reklaw | — | |
| Wilcox | — | |
| Olmos | — | |
| Navarro | — | |
| Escondido | — |
12 TOPS · FIRST 8
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/01336072, documented in the API reference.