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Producing

BARNHART (EF) B

Barnhart (Ef) B is an oil lease in Gonzales County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field.

1 well

3,712bbl oil, last 12 months−37% vs prior year
Operator
Marathon Oil Ef LLC
County
Gonzales County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-17065

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Where it sits

This county

Gonzales CountyGonzalesWilsonLavacaFayetteCaldwellBastropDe WittHaysGuadalupeGonzales County
Gonzales County
Gas, last 12 months
2,331 mcf
Oil in Jul 2026
423 bbl

Checks stopped on this lease?

  • Buyer

    Buyer changed: ENSIGN NATURAL RESOURCES II LLC replaced MARATHON OIL EF LLC as the buyer of this lease's gas from oil wells on Sep 1, 2026.

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

See why checks stop on this lease

Production by month

Oil output fell 37% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 37% over the last 12 monthsMonthly oil production and gas for BARNHART (EF) B, Aug 2023 to Jul 2026. Oil output fell 37% over the last 12 months. 3,712 bbl in the 12 months through Jul 2026, against 5,865 bbl in the 12 months before.Last 12 months: 3,712 bblbbl per monthmcf per month002002504005006007508001,0001,0001,250Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 37% over the last 12 monthsMonthly oil production and gas for BARNHART (EF) B, Aug 2023 to Jul 2026. Oil output fell 37% over the last 12 months. 3,712 bbl in the 12 months through Jul 2026, against 5,865 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002002504005006007508001,0001,0001,250Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

87% of the gas went to a processing plant in the last 12 months

Flaring peaked at 3.9% of the gas in Aug 2025.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
87% of the gas went to a processing plant in the last 12 monthsShare of BARNHART (EF) B gas by disposition code each month, Aug 2023 to Jul 2026. 87% of the gas went to a processing plant in the last 12 months. Flaring peaked at 3.9% of the gas in Aug 2025.Share of the lease’s gas by disposition code, per month0%50%100%Flared 3.9%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
87% of the gas went to a processing plant in the last 12 monthsShare of BARNHART (EF) B gas by disposition code each month, Aug 2023 to Jul 2026. 87% of the gas went to a processing plant in the last 12 months. Flaring peaked at 3.9% of the gas in Aug 2025.Share of gas by disposition code0%50%100%Flared 3.9%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    87% · 4,074 mcf

  • Lease fuel (1)

    11% · 510 mcf

  • Flared (4)

    1.8% · 86 mcf

1.8% of the gas flared in the last 12 months. 4 months above 3%.

1 well on this lease

Wells on BARNHART (EF) B
API numberWell no.Status
42-177-328831HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Mv Purchasing, LLCOilGathers34Sep 1, 2026–
Plains Marketing, L.p.OilGathers33Sep 1, 2026–
Shell Trading (Us) CompanyOilGathers33Sep 1, 2026–
Ensign Natural Resources II LLCCasinghead gasBuys100Sep 1, 2026–
Ensign Natural Resources II LLCCasinghead gasGathers100Sep 1, 2026–
Marathon Oil Ef LLCCasinghead gasGathers100Jul 29, 2013Sep 1, 2026
Marathon Oil Ef LLCCasinghead gasBuys100Jul 29, 2013Sep 1, 2026
Enterprise Crude Oil LLCOilGathers20Sep 1, 2022Sep 1, 2026
Phillips 66 CompanyOilGathers10Sep 1, 2022Sep 1, 2026
Reynolds Energy Transport LLCOilGathers10Sep 1, 2022Sep 1, 2026
Sentinel Transportation, LLCOilGathers10Sep 1, 2022Sep 1, 2026

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

Who buys my oilOil price check

73.11 acres on the newest permit

  • Worth asking

    A Rule 37 case is listed

    The RRC permit records list a Rule 37 case. This does not establish your royalty share. Ask for the permit and unit plat for your well.

Check your decimal on this lease
Permits for Barnhart (Ef) B
API numberWell no.Acreson the permit
42-177-328831H73.11

SourceRailroad Commission drilling permits, Sep 26, 2026 (source 1, source 2).

Unit decimal checker

What ConocoPhillips told investors it received

Marathon Oil Ef LLC is linked to ConocoPhillips (MRO).
Realized prices reported by ConocoPhillips
QuarterOil$ per bblFiling
Q2 2026$99.40SEC filing
Q1 2026$73.47SEC filing
Q3 2025$66.13SEC filing
Q2 2025$64.23SEC filing
Q1 2025$71.65SEC filing

SourceConocoPhillips quarterly reports, SEC EDGAR, company-wide averages before hedging.

Estimate your royalty

36 months, newest first

Ledger for BARNHART (EF) B
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20264234152211864$80.46$2.89
Jun 2026474626221$84.81$3.15
May 202607000$102.13$2.94
Apr 20263643581841547$100.32$2.77
Mar 2026606942341$91.38$3.04
Feb 202663163139933811$64.51$3.62
Jan 202656256440333813$60.04$7.72
Dec 202583883442135410$57.97$4.26
Nov 20254514432742348$60.06$3.79
Oct 202500000$60.89$3.19
Sep 202505000$63.96$2.97
Aug 202533634036130614$64.86$2.91
Jul 20256056066906234$68.39$3.20
Jun 20255925897436696$68.17$3.02
May 20256676679068167$62.17$3.12
Apr 20257727721,1051,00214$63.54$3.42
Mar 202586486278171713$68.24$4.12
Feb 20256016054804456$71.53$4.19
Jan 20254784693112854$75.74$4.13
Dec 202403000$70.12$3.01
Nov 20242812851751613$69.95$2.12
Oct 20248078025505069$71.99$2.20
Sep 202419819693852$70.24$2.28
Aug 202403000$76.68$1.99
Jul 20242352352782573$81.80$2.07
Jun 20243113115264847$79.77$2.54
May 20243293325294875$80.02$2.12
Apr 20245805756626175$85.35$1.60
Mar 20241101121581481$81.28$1.49
Feb 20244084105034732$77.25$1.72
Jan 20243893864133874$74.15$3.18
Dec 20233763755214903$71.90$2.52
Nov 20232642665625312$77.69$2.71
Oct 20232532514454192$85.64$2.98
Sep 202378782692533$89.43$2.64
Aug 202312813081751$81.39$2.58

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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Nearby

This lease belongs to

OperatorMarathon Oil Ef LLCFieldEagleville (Eagle Ford-1)CountyGonzales County

Marathon Oil Ef LLC in Gonzales County

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Eagleville (Eagle Ford-1) field

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