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Royalty Clerk

Texas oil lease · RRC district 04 · Lease 12458

Producing

KILLAM "257"

Killam "257" is an oil lease in Duval County, Texas, operated by Killam Oil Co., Ltd. in the Lundell field. The Railroad Commission shows 2,722 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 8 wells

2,722bbl oil, last 12 months−7% vs prior year
Operator
Killam Oil Co., Ltd.
County
Duval County
Field
Lundell
RRC lease
04-12458

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Where it sits

This county

Duval CountyDuvalJim WellsDuval County
Duval County · RRC district 04Open Duval County →
Oil in Jul 2026
231 bbl
Reporting to the state
since Jan 2020
Wells
8
Data through
Jul 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 7% over the last 12 months

2,722 bbl in the 12 months through Jul 2026, against 2,915 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Last 12 months
Oil output fell 7% over the last 12 monthsMonthly oil production for KILLAM "257", Aug 2023 to Jul 2026. Oil output fell 7% over the last 12 months. 2,722 bbl in the 12 months through Jul 2026, against 2,915 bbl in the 12 months before.Last 12 months: 2,722 bblbbl per month0100200300400Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 7% over the last 12 monthsMonthly oil production for KILLAM "257", Aug 2023 to Jul 2026. Oil output fell 7% over the last 12 months. 2,722 bbl in the 12 months through Jul 2026, against 2,915 bbl in the 12 months before.Last 12 monthsbbl per month0100200300400Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 12458, district 04. 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.

Killam Oil Co., Ltd. has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeKillam Oil Co., Ltd., Jan 2020 to Jul 20262020202120222023202420252026Killam Oil Co., Ltd.Jan 2020 to nowthrough Jul 2026
Operators of this lease over timeKillam Oil Co., Ltd., Jan 2020 to Jul 20262020202120222023202420252026Killam Oil Co., Ltd.Jan 2020 to nowthrough Jul 2026

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

Wells

8 wells on this lease

Every well the Railroad Commission links to oil lease 12458 in district 04. The API number is the state’s ID for a well.
Wells on KILLAM "257"
API numberWell no.Status
42-131-3802712Shut-in
42-131-3803413Active
42-131-3804514Active
42-131-3807615Active
42-131-3807716Shut-in
42-131-3807817Active
42-131-3808719Shut-in
42-131-3930021Active

SourceTexas Railroad Commission Wellbore Query, district 04, lease 12458.

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

    Gulfmark Energy, Inc. and Valero Marketing and Supply Co. gather it.

    Gulfmark Energy, Inc. gathers it: 50% of it, on the list since Apr 1, 2012 · Valero Marketing and Supply Co. gathers it: 50% of it, on the list since Apr 1, 2012

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

506.34 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
87 not plugged
Horizontal
0
First completion
Apr 25, 1995
Latest permit
Jun 15, 2012

The wells on this lease state different acreage

The permits state between 247 and 506.34 acres. Use the acres from your own division order for the well you are paid on.

8 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 Killam "257"
API numberWell no.Acreson the permit
42-131-3930021506.34
42-131-3808719407
42-131-3807615407
42-131-3807716407
42-131-3807817407
42-131-3804514247
42-131-3803413247
42-131-3802712247

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 KILLAM "257" 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 KILLAM "257"
MonthOil producedbblOil soldbblWTI$ per bblHenry Hub$ per MMBtu
Jul 2026Killam Oil231280$80.46$2.89
Jun 2026Killam Oil304136$84.81$3.15
May 2026Killam Oil226281$102.13$2.94
Apr 2026Killam Oil263280$100.32$2.77
Mar 2026Killam Oil249277$91.38$3.04
Feb 2026Killam Oil207138$64.51$3.62
Jan 2026Killam Oil285284$60.04$7.72
Dec 2025Killam Oil201276$57.97$4.26
Nov 2025Killam Oil174133$60.06$3.79
Oct 2025Killam Oil165127$60.89$3.19
Sep 2025Killam Oil185278$63.96$2.97
Aug 2025Killam Oil232284$64.86$2.91
Jul 2025Killam Oil265134$68.39$3.20
Jun 2025Killam Oil238278$68.17$3.02
May 2025Killam Oil249279$62.17$3.12
Apr 2025Killam Oil244281$63.54$3.42
Mar 2025Killam Oil255271$68.24$4.12
Feb 2025Killam Oil238140$71.53$4.19
Jan 2025Killam Oil240281$75.74$4.13
Dec 2024Killam Oil184136$70.12$3.01
Nov 2024Killam Oil184271$69.95$2.12
Oct 2024Killam Oil279267$71.99$2.20
Sep 2024Killam Oil243267$70.24$2.28
Aug 2024Killam Oil296269$76.68$1.99
Jul 2024Killam Oil267274$81.80$2.07
Jun 2024Killam Oil252136$79.77$2.54
May 2024Killam Oil292402$80.02$2.12
Apr 2024Killam Oil290280$85.35$1.60
Mar 2024Killam Oil280278$81.28$1.49
Feb 2024Killam Oil325285$77.25$1.72
Jan 2024Killam Oil280268$74.15$3.18
Dec 2023Killam Oil283269$71.90$2.52
Nov 2023Killam Oil284273$77.69$2.71
Oct 2023Killam Oil267268$85.64$2.98
Sep 2023Killam Oil253275$89.43$2.64
Aug 2023Killam Oil284276$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).

Check your statements

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Upload your statements for KILLAM "257". We compare volumes, prices, deductions and timing with the state record and give you the exact question to ask Killam Oil Co., Ltd.

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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

OperatorKillam Oil Co., Ltd.FieldLundellCountyDuval County

Killam Oil Co., Ltd. in Duval County

All Killam Oil Co., Ltd. leases →

Lundell field

All leases in this field →

Leases within 10 km

Found by the location of their wells.

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 Jul 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 12458, district 04, 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.

FAQ

Questions about KILLAM "257"

Who operates the KILLAM "257" lease?

The Railroad Commission lists Killam Oil Co., Ltd. (operator number 460054) as the operator of this lease in Duval County, Texas. The operator history on this page shows earlier operators and when the record changed.

How much has the KILLAM "257" lease produced?

The lease reported 2,722 bbl of oil in the last 12 months through Jul 2026. Monthly figures for 36 months are in the ledger on this page, taken from the Railroad Commission's production data.

Does this page show who owns the royalty?

No. Railroad Commission records show who operates a lease and what it reported, not who owns the minerals or receives royalty. Your division order and royalty stub name the lease and your decimal interest.

How do I check my royalty stub against this lease?

Multiply the lease's volume for a month by your decimal interest and compare it with the barrels and mcf on your stub for the same month. The two are seldom identical, since sales and reporting months can differ, but a large gap is worth a question to the operator.

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