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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 01364

Shut in

HALFF & OPPENHEIMER

Halff & Oppenheimer is an oil lease in Frio County, Texas, operated by Bigfoot Oil LLC in the Pearsall (Navarro Sand) field. The Railroad Commission shows 299 bbl of oil in the 12 months through Jun 2026.

Oil lease dossier · 18 wells

299bbl oil, last 12 months−91% vs prior year
Operator
Bigfoot Oil LLC
County
Frio County
Field
Pearsall (Navarro Sand)
RRC lease
01-01364

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Where it sits

This county

Frio CountyFrioZavalaAtascosaUvaldeMedinaBexarFrio County
Frio County · RRC district 01Open Frio County →
Oil in Jun 2026
0 bbl
Reporting to the state
since Jan 2020
Wells
18
Data through
Jun 2026

Production

Month by month, from the state record

What the Railroad Commission says this oil lease produced. Oil is in barrels (bbl). Gas is in thousand cubic feet (mcf).

Oil output fell 91% over the last 12 months

299 bbl in the 12 months through Jul 2026, against 3,289 bbl in the 12 months before. Jul 2026 was not reported. A red cross marks each one.

  • Oil (bars, left axis)
  • Last 12 months
Oil output fell 91% over the last 12 monthsMonthly oil production for HALFF & OPPENHEIMER, Aug 2023 to Jul 2026. Oil output fell 91% over the last 12 months. 299 bbl in the 12 months through Jul 2026, against 3,289 bbl in the 12 months before.Last 12 months: 299 bblbbl per month0200400600800Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 91% over the last 12 monthsMonthly oil production for HALFF & OPPENHEIMER, Aug 2023 to Jul 2026. Oil output fell 91% over the last 12 months. 299 bbl in the 12 months through Jul 2026, against 3,289 bbl in the 12 months before.Last 12 monthsbbl per month0200400600800Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 01364, district 01. Reported through Jul 2026. The state revises recent months.

Gas disposition

Where the gas went

Every month the operator tells the state where each mcf of gas went, using a code. The code decides how your gas is paid.

No gas disposition reported for this lease

The operator has not reported where the gas went in the months we hold.

Operator history

Who has run this lease

The operator runs the wells and pays your royalty. When the operator changes, payments often slip for a month or two.

Bigfoot Oil LLC has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeBigfoot Oil LLC, Jan 2020 to Jun 20262020202120222023202420252026Bigfoot Oil LLCJan 2020 to nowthrough Jul 2026
Operators of this lease over timeBigfoot Oil LLC, Jan 2020 to Jun 20262020202120222023202420252026Bigfoot Oil LLCJan 2020 to nowthrough Jul 2026

SourceTexas Railroad Commission Production Data Query, operator by month. Reported through Jul 2026.

Wells

18 wells on this lease

Every well the Railroad Commission links to oil lease 01364 in district 01. The API number is the state’s ID for a well.
Wells on HALFF & OPPENHEIMER
API numberWell no.Status
42-163-0123114Active
42-163-012348Active
42-163-012359Active
42-163-012373Shut-in
42-163-0123921Active
42-163-0124012Active
42-163-012912Active
42-163-012926Active
42-163-012957Active
42-163-0129616Shut-in
42-163-0129718Active
42-163-0129920Active
42-163-30904116Shut-in
42-163-32176416Active
42-163-32187216Active
42-163-328311BShut-in
42-163-331791AActive
42-163-332531 RActive

SourceTexas Railroad Commission Wellbore Query, district 01, lease 01364.

Who buys and gathers

Who moves and buys this lease's production

The operator files a Form P-4 with the Railroad Commission naming the companies authorised to gather and buy the oil and gas. The buyer's price is the one your royalty is figured on.

  • Oil

    Plains Marketing, L.p. gathers it.

    100% of it, on the list since May 1, 2025

Companies that used to be listed: 4J Energy, LLC (gathers it, until May 1, 2025); Texican Crude&hydrocarbons, LLC (gathers it, until Oct 1, 2024); Plains Marketing, L.p. (gathers it, until Mar 1, 2021); Gibson Energy Marketing, LLC (gathers it, until Nov 1, 2020); Shell Trading (Us) Company (gathers it, until May 1, 2020).

SourceRailroad Commission of Texas, Form P-4 file, dated Sep 24, 2026 (source). A listed company is authorised to move or buy the production; the state does not say what it paid.

Who buys my oil and gasIs my oil price fair?

Unit and wells

1,455.38 acres on the newest permit

Acres and wells as the operator filed them on its Railroad Commission drilling permits. Your decimal is your net acres over the unit acres, so this is the number to hold your division order against.
Wells on the permits
207 not plugged
Horizontal
0
First completion
Jul 20, 1943
Latest permit
Feb 19, 2020

The wells on this lease state different acreage

The permits state between 1,042 and 1,455.38 acres. Use the acres from your own division order for the well you are paid on.

20 wells are listed on this lease

Each well can have its own unit. The decimal for one well does not have to equal the decimal for another.

Wells and acres on the permits for Halff & Oppenheimer
API numberWell no.Acreson the permit
42-163-332531 R1,455.38
42-163-328311B1,162
42-163-3317911,042
42-163-331791A1,042
42-163-321872161,162
42-163-321764161,162
42-163-309041161,162
42-163-0123114–
42-163-012348–
42-163-012359–
42-163-012373–
42-163-0123921–

SourceRailroad Commission of Texas, drilling permits and wellbore file, Sep 26, 2026 (source 1, source 2). The acres are what the operator filed; they are not a survey.

Check my decimal against the unit

Estimator

Estimate your royalty for this lease

A rough check before you look at a statement: the state volumes times your decimal, priced at WTI and Henry Hub.

Estimator

What could your check be?

Your decimal interest is the small number on your division order that says what share of the whole lease (8/8ths) is yours. Type it in and we apply it to what the state says HALFF & OPPENHEIMER sold each month.

For example 0.00097656, or a fraction like 1/1024.

Dollars per barrel. Your statements show the gap your operator uses. Leave 0 to price oil at WTI.

Your estimate appears here

Enter your decimal to see an estimated royalty for each of the last 12 months this lease reported. Nothing you type leaves your browser.

An estimate, not your check

It ignores gathering and processing fees, taxes, plant products and the price your operator actually gets, so your statement will differ. Use it as a ceiling to compare against.

Ledger

36 months, newest first

Compare these numbers with your statements. Your share of a month is the “Oil sold” volume times your decimal. Scroll sideways on a phone.
Monthly production, disposition and prices for HALFF & OPPENHEIMER
MonthOil producedbblOil soldbblWTI$ per bblHenry Hub$ per MMBtu
Jul 2026No report––$80.46$2.89
Jun 2026Bigfoot Oil00$84.81$3.15
May 2026Bigfoot Oil00$102.13$2.94
Apr 2026Bigfoot Oil00$100.32$2.77
Mar 2026Bigfoot Oil00$91.38$3.04
Feb 2026Bigfoot Oil00$64.51$3.62
Jan 2026Bigfoot Oil00$60.04$7.72
Dec 2025Bigfoot Oil00$57.97$4.26
Nov 2025Bigfoot Oil00$60.06$3.79
Oct 2025Bigfoot Oil00$60.89$3.19
Sep 2025Bigfoot Oil143143$63.96$2.97
Aug 2025Bigfoot Oil156156$64.86$2.91
Jul 2025Bigfoot Oil00$68.39$3.20
Jun 2025Bigfoot Oil158158$68.17$3.02
May 2025Bigfoot Oil158158$62.17$3.12
Apr 2025Bigfoot Oil160160$63.54$3.42
Mar 2025Bigfoot Oil132132$68.24$4.12
Feb 2025Bigfoot Oil735735$71.53$4.19
Jan 2025Bigfoot Oil603603$75.74$4.13
Dec 2024Bigfoot Oil450450$70.12$3.01
Nov 2024Bigfoot Oil264264$69.95$2.12
Oct 2024Bigfoot Oil427427$71.99$2.20
Sep 2024Bigfoot Oil5656$70.24$2.28
Aug 2024Bigfoot Oil146146$76.68$1.99
Jul 2024Bigfoot Oil778778$81.80$2.07
Jun 2024Bigfoot Oil460460$79.77$2.54
May 2024Bigfoot Oil444444$80.02$2.12
Apr 2024Bigfoot Oil460460$85.35$1.60
Mar 2024Bigfoot Oil762762$81.28$1.49
Feb 2024Bigfoot Oil471471$77.25$1.72
Jan 2024Bigfoot Oil310310$74.15$3.18
Dec 2023Bigfoot Oil461461$71.90$2.52
Nov 2023Bigfoot Oil458458$77.69$2.71
Oct 2023Bigfoot Oil0313$85.64$2.98
Sep 2023Bigfoot Oil786786$89.43$2.64
Aug 2023Bigfoot Oil769769$81.39$2.58

No report filed More than 3% of gas flared

SourceVolumes: Texas Railroad Commission Production Data Query, reported through Jul 2026. Prices: EIA WTI Cushing spot and Henry Hub spot, monthly, through Aug 2026. “Gas sold” is gas sent to a transmission line (code 2) or a plant (code 3).

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Around this lease

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Everything on this page connects to the operator, field and county records. Start from any of them.

This lease belongs to

OperatorBigfoot Oil LLCFieldPearsall (Navarro Sand)CountyFrio County

Bigfoot Oil LLC in Frio County

All Bigfoot Oil LLC leases →

Pearsall (Navarro Sand) field

All leases in this field →

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Drilling permits within 10 km

How to read this page

Questions owners ask

What is a decimal interest?

It is your share of the whole lease, written as a decimal. A 1/4 royalty on 5 net acres in a 1,280-acre unit is 1/4 × 5 ÷ 1,280 = 0.00097656. Your division order states yours.

How do I use this page to check a royalty check?

Take the “Oil sold” volume for the month the check covers and multiply it by your decimal. The answer should match the barrels on your statement. If it does not, upload the statement and we will show where the two differ.

Why is the newest month Jun 2026?

The Railroad Commission publishes production two to three months after the fact and revises recent months. We re-pull the latest three months on every update.

Does this page show what my check should be?

No. It shows what the state recorded. Prices, fees and taxes depend on your lease and on what your operator gets for the oil and gas. The estimator gives a ceiling to compare against.

Sources and method

Where these numbers come from

  • Production and disposition by month: Texas Railroad Commission Production Data Query, oil lease 01364, district 01, reported through Jul 2026.
  • Wells: Texas Railroad Commission Wellbore Query.
  • Prices: U.S. Energy Information Administration, WTI Cushing spot and Henry Hub spot, monthly.
  • Page updated Sep 28, 2026.

We show the state’s numbers as filed. Where the state has no report for a month, we say so instead of guessing.