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Texas oil lease

Producing

BIG BERTHA 0310 F

Big Bertha 0310 F is an oil lease in Upton County, Texas, operated by Firebird Energy II LLC in the Spraberry (Trend Area) field.

2 wells

132,166bbl oil, since Jan 2026
Operator
Firebird Energy II LLC
County
Upton County
Field
Spraberry (Trend Area)
RRC lease
7C-23547

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Where it sits

This county

Upton CountyUptonMidlandCraneGlasscockReaganEctorUpton County
Upton County
Gas, since Jan 2026
268,938 mcf
Oil in Jul 2026
12,575 bbl
First check

Production started January 2026; the first check is due by about May 31, 2026 (estimate).

When is my first royalty check due?

Production by month

Oil output rose 18% since Jan 2026

  • Oil (bars)
  • Gas (line)
Oil output rose 18% since Jan 2026Monthly oil production and gas for BIG BERTHA 0310 F, Jan 2026 to Jul 2026. Oil output rose 18% since Jan 2026. Monthly average of 18,246 bbl in the latest 3 months, against 15,475 bbl in the first 3.bbl per monthmcf per month0010k20k20k40k30k60k40k80kOct 25Jan 26AprJul
Oil output rose 18% since Jan 2026Monthly oil production and gas for BIG BERTHA 0310 F, Jan 2026 to Jul 2026. Oil output rose 18% since Jan 2026. Monthly average of 18,246 bbl in the latest 3 months, against 15,475 bbl in the first 3.bbl per monthmcf per month0010k20k20k40k30k60k40k80kJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

98% of the gas went to a transmission line in the 7 months reported

Flaring peaked at 3.7% of the gas in Jul 2026.

  • Transmission line (2)
  • Flared (4)
98% of the gas went to a transmission line in the 7 months reportedShare of BIG BERTHA 0310 F gas by disposition code each month, Jan 2026 to Jul 2026. 98% of the gas went to a transmission line in the 7 months reported. Flaring peaked at 3.7% of the gas in Jul 2026.Share of the lease’s gas by disposition code, per month0%50%100%Flared 3.7%Oct 25Jan 26AprJul
98% of the gas went to a transmission line in the 7 months reportedShare of BIG BERTHA 0310 F gas by disposition code each month, Jan 2026 to Jul 2026. 98% of the gas went to a transmission line in the 7 months reported. Flaring peaked at 3.7% of the gas in Jul 2026.Share of gas by disposition code0%50%100%Flared 3.7%Jan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Transmission line (2)

    98% · 263,268 mcf

  • Flared (4)

    2.1% · 5,670 mcf

2.1% of the gas flared in the 7 months reported. 2 months above 3%.

2 wells on this lease

Wells on BIG BERTHA 0310 F
API numberWell no.Status
42-461-43008401HActive
42-461-43009101HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Plains Marketing, L.p.OilGathers100Jan 14, 2026
Energy Transfer CompanyCasinghead gasBuys100Jan 14, 2026
Energy Transfer CompanyCasinghead gasGathers100Jan 14, 2026

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

Who buys my oilOil price check

1,320.70 acres on the newest permit

  • Worth asking

    An allocation well is on this lease

    A well drilled across several tracts shares its production by an allocation formula, so the decimal is not always your acres over the unit acres. Ask the operator for the allocation formula and the tract factor for your land.

Check your decimal on this lease
Permits for Big Bertha 0310 F
API numberWell no.Acreson the permit
42-461-43008401H1,320.70
42-461-43009101H1,320.70

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

Unit decimal checker

Estimate your royalty

7 months, newest first

Ledger for BIG BERTHA 0310 F
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202612,57512,53737,30735,9241,383$80.46$2.89
Jun 202618,47118,56554,70053,0871,613$84.81$3.15
May 202623,69223,73663,86163,000861$102.13$2.94
Apr 202631,00330,84263,33462,1921,142$100.32$2.77
Mar 202623,14523,33630,65930,63326$91.38$3.04
Feb 202621,42821,45818,02617,408618$64.51$3.62
Jan 20261,8521,4961,0511,02427$60.04$7.72

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

OperatorFirebird Energy II LLCFieldSpraberry (Trend Area)CountyUpton County

Firebird Energy II LLC in Upton County

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Spraberry (Trend Area) field

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