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Texas oil lease

Producing

4K BLACK HILLS UNIT B

4K Black Hills Unit B is an oil lease in Atascosa County, Texas, operated by Trailblazer Energy Resources,llc in the Eagleville (Eagle Ford-1) field.

2 wells

64,112bbl oil, last 12 months
Operator
Trailblazer Energy Resources,llc
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-21646

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
40,673 mcf
Oil in Jul 2026
3,748 bbl

Checks stopped on this lease?

  • Operator

    Operator changed: Trailblazer Energy Resources,llc took over from Pillar Efs, LLC in Feb 2026.

  • P-5

    The previous operator's P-5 registration is listed as inactive since Jul 21, 2026 (last P-5 filed Mar 2, 2026).

SourceRailroad Commission production, P-5 and P-4 records, data through Jul 2026.

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Production by month

Oil output fell 78% since Dec 2024

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 78% since Dec 2024Monthly oil production and gas for 4K BLACK HILLS UNIT B, Dec 2024 to Jul 2026. Oil output fell 78% since Dec 2024. Monthly average of 4,531 bbl in the latest 3 months, against 20,672 bbl in the first 3.Last 12 months: 64,112 bblbbl per monthmcf per month005,0002,50010k5,00015k7,50020k10k25k12.5kJan 25AprJulOctJan 26AprJul
Oil output fell 78% since Dec 2024Monthly oil production and gas for 4K BLACK HILLS UNIT B, Dec 2024 to Jul 2026. Oil output fell 78% since Dec 2024. Monthly average of 4,531 bbl in the latest 3 months, against 20,672 bbl in the first 3.Last 12 monthsbbl per monthmcf per month005,0002,50010k5,00015k7,50020k10k25k12.5kJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

Since Jun 2026 the lease's gas goes to a transmission line instead of a processing plant

Flaring peaked at 15.0% of the gas in Dec 2025.

  • Processing plant (3)
  • Transmission line (2)
  • Flared (4)
Since Jun 2026 the lease's gas goes to a transmission line instead of a processing plantShare of 4K BLACK HILLS UNIT B gas by disposition code each month, Dec 2024 to Jul 2026. Since Jun 2026 the lease's gas goes to a transmission line instead of a processing plant. Flaring peaked at 15.0% of the gas in Dec 2025.Share of the lease’s gas by disposition code, per month0%50%100%Jun 2026: plant to lineFlared 15.0%Jan 25AprJulOctJan 26AprJul
Since Jun 2026 the lease's gas goes to a transmission line instead of a processing plantShare of 4K BLACK HILLS UNIT B gas by disposition code each month, Dec 2024 to Jul 2026. Since Jun 2026 the lease's gas goes to a transmission line instead of a processing plant. Flaring peaked at 15.0% of the gas in Dec 2025.Share of gas by disposition code0%50%100%Jun 26: plant to lineFlared 15.0%Jan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Transmission line (2)

    60% · 24,591 mcf

  • Processing plant (3)

    37% · 15,050 mcf

  • Flared (4)

    2.5% · 1,032 mcf

2.5% of the gas flared in the last 12 months. 8 months above 3%.

Who has run this lease

The operator changed once, most recently in Feb 2026

Operators of this lease over timePillar Efs, LLC, Dec 2024 to Jan 2026; Trailblazer Energy Resources,llc, Feb 2026 to Jul 202620252026Changed Feb 2026Pillar Efs, LLCDec 2024 to Jan 2026Trailblazer Energy Resources,…Feb 2026 to now
Operators of this lease over timePillar Efs, LLC, Dec 2024 to Jan 2026; Trailblazer Energy Resources,llc, Feb 2026 to Jul 202620252026Changed Feb 2026Pillar Efs, LLCDec 2024 to Jan 2026Trailblazer Energy Resources,llcFeb 2026 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

2 wells on this lease

Wells on 4K BLACK HILLS UNIT B
API numberWell no.Status
42-013-360721HActive
42-013-360732HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enterprise Crude Oil LLCOilGathers90Jun 1, 2026–
Texon Midstream, LLCOilGathers10Jun 1, 2026–
Et Gathering & Processing LLCCasinghead gasBuys100Dec 3, 2024–
Energy Transfer CompanyCasinghead gasGathers100Dec 3, 2024–
Enterprise Crude Oil LLCOilGathers100Dec 3, 2024Jun 1, 2026

SourceRailroad Commission Form P-4 file, Sep 24, 2026 (source).

Who buys my oilOil price check

537.34 acres on the newest permit

Check your decimal on this lease
Permits for 4K Black Hills Unit B
API numberWell no.Acreson the permit
42-013-360721H537.34
42-013-360732H537.34

SourceRailroad Commission drilling permits, Oct 3, 2026 (source 1, source 2).

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20 months, newest first

Ledger for 4K BLACK HILLS UNIT B
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Trailblazer Energy3,7483,8504,4894,4890$80.46$2.89
Jun 2026Trailblazer Energy4,4484,1044,7894,7890$84.81$3.15
May 2026Trailblazer Energy5,3975,5267,1567,07779$102.13$2.94
Apr 2026Trailblazer Energy4,9544,6853,4103,257153$100.32$2.77
Mar 2026Trailblazer Energy5,4535,7764,8734,716157$91.38$3.04
Feb 2026Trailblazer Energy6,4886,4313,4143,297117$64.51$3.62
Jan 2026Pillar Efs,4,3754,1452,1062,1060$60.04$7.72
Dec 2025Pillar Efs,5,0345,0392,0961,782314$57.97$4.26
Nov 2025Pillar Efs,5,1695,2172,0002,0000$60.06$3.79
Oct 2025Pillar Efs,6,0816,2012,1282,1280$60.89$3.19
Sep 2025Pillar Efs,6,3646,2522,0231,94281$63.96$2.97
Aug 2025Pillar Efs,6,6016,6812,1892,058131$64.86$2.91
Jul 2025Pillar Efs,7,4407,5143,0153,0150$68.39$3.20
Jun 2025Pillar Efs,7,5717,9373,2423,20834$68.17$3.02
May 2025Pillar Efs,10,0109,4124,3003,946354$62.17$3.12
Apr 2025Pillar Efs,12,01011,8104,8874,678209$63.54$3.42
Mar 2025Pillar Efs,8,4708,8255,3975,3970$68.24$4.12
Feb 2025Pillar Efs,14,51914,1957,0037,0030$71.53$4.19
Jan 2025Pillar Efs,22,91522,93510,03210,0320$75.74$4.13
Dec 2024Pillar Efs,24,58224,3019,6269,6260$70.12$3.01

Flared above 3%

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Oct 2, 2026.

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This lease belongs to

OperatorTrailblazer Energy Resources,llcFieldEagleville (Eagle Ford-1)CountyAtascosa County

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