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Royalty Clerk

Texas oil lease · RRC district 7B · Lease 18663

Producing

DUFFER

Duffer is an oil lease in Eastland County, Texas, operated by Byrne Oil Company in the Adams (Duffer, Lower) field. The Railroad Commission shows 670 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 4 wells

670bbl oil, last 12 months+149% vs prior year
Operator
Byrne Oil Company
County
Eastland County
Field
Adams (Duffer, Lower)
RRC lease
7B-18663

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Where it sits

This county

Eastland CountyEastlandShackelfordCallahanPalo PintoErathComancheStephensEastland County
Eastland County · RRC district 7BOpen Eastland County →
Gas, last 12 months
1,507 mcf
Oil in Jul 2026
80 bbl
Reporting to the state
since Jan 2020
Wells
4

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 rose 149% over the last 12 months

670 bbl in the 12 months through Jul 2026, against 269 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Gas (line, right axis)
  • Last 12 months
Oil output rose 149% over the last 12 monthsMonthly oil production and gas for DUFFER, Aug 2023 to Jul 2026. Oil output rose 149% over the last 12 months. 670 bbl in the 12 months through Jul 2026, against 269 bbl in the 12 months before.Last 12 months: 670 bblbbl per monthmcf per month002050401006015080200Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 149% over the last 12 monthsMonthly oil production and gas for DUFFER, Aug 2023 to Jul 2026. Oil output rose 149% over the last 12 months. 670 bbl in the 12 months through Jul 2026, against 269 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002050401006015080200Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 18663, district 7B. 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.

All of the gas went to a transmission line in the last 12 months

Each bar is one month. Colors are the disposition codes the operator reported.

All of the gas went to a transmission line in the last 12 monthsShare of DUFFER gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a transmission line in the last 12 months. Share of the lease’s gas by disposition code, per month0%50%100%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
All of the gas went to a transmission line in the last 12 monthsShare of DUFFER gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a transmission line in the last 12 months. Share of gas by disposition code0%50%100%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, gas disposition by code, lease 18663, district 7B. Reported through Jul 2026.

Transmission line (2)

Sold straight into a pipeline without processing. Processing fees on your statement would be worth asking about.

None of the gas was flared in the last 12 months.

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.

Byrne Oil Company has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeByrne Oil Company, Jan 2020 to Jul 20262020202120222023202420252026Byrne Oil CompanyJan 2020 to nowthrough Jul 2026
Operators of this lease over timeByrne Oil Company, Jan 2020 to Jul 20262020202120222023202420252026Byrne Oil CompanyJan 2020 to nowthrough Jul 2026

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

Wells

4 wells on this lease

Every well the Railroad Commission links to oil lease 18663 in district 7B. The API number is the state’s ID for a well.
Wells on DUFFER
API numberWell no.Status
42-133-341381Active
42-133-351442Active
42-133-360543Active
42-133-382744Active

SourceTexas Railroad Commission Wellbore Query, district 7B, lease 18663.

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

    Energy Trans Crude Marketing LLC gathers it.

    100% of it, on the list since Jul 1, 2021

  • Gas from oil wells

    Colt Gathering (North Texas)l.p. buys and gathers it.

    Colt Gathering (North Texas)l.p. buys it: 100% of it, on the list since Jan 1, 2022 · Colt Gathering (North Texas)l.p. gathers it: 100% of it, on the list since Jan 1, 2022

Companies that used to be listed: Midcoast Gathering (N Tx) L.p. (gathers it, until Jul 1, 2021); Midcoast G & P (North Texas)l.p. (buys it, until Jul 1, 2021); Sunoco Ptnrs. Mktg.&terminals LP (gathers it, until Jul 1, 2021).

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

520.27 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
44 not plugged
Horizontal
0
First completion
Oct 1, 1982
Latest permit
May 15, 2019

The wells on this lease state different acreage

The permits state between 40 and 520.27 acres. Use the acres from your own division order for the well you are paid on.

Wells and acres on the permits for Duffer
API numberWell no.Acreson the permit
42-133-382744520.27
42-133-351442520
42-133-360543520
42-133-34138140

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 DUFFER 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. Regional gas prices are often below Henry Hub.

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 DUFFER
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3Flaredmcf, code 4WTI$ per bblHenry Hub$ per MMBtu
Jul 2026Byrne Oil80911621620$80.46$2.89
Jun 2026Byrne Oil64871511510$84.81$3.15
May 2026Byrne Oil69931621620$102.13$2.94
Apr 2026Byrne Oil6901571570$100.32$2.77
Mar 2026Byrne Oil76751681680$91.38$3.04
Feb 2026Byrne Oil48961281280$64.51$3.62
Jan 2026Byrne Oil4501101100$60.04$7.72
Dec 2025Byrne Oil50891061060$57.97$4.26
Nov 2025Byrne Oil44361201200$60.06$3.79
Oct 2025Byrne Oil19088880$60.89$3.19
Sep 2025Byrne Oil488875750$63.96$2.97
Aug 2025Byrne Oil58080800$64.86$2.91
Jul 2025Byrne Oil518979790$68.39$3.20
Jun 2025Byrne Oil27078780$68.17$3.02
May 2025Byrne Oil234580800$62.17$3.12
Apr 2025Byrne Oil293892920$63.54$3.42
Mar 2025Byrne Oil282789890$68.24$4.12
Feb 2025Byrne Oil28063630$71.53$4.19
Jan 2025Byrne Oil10037370$75.74$4.13
Dec 2024Byrne Oil193878780$70.12$3.01
Nov 2024Byrne Oil12057570$69.95$2.12
Oct 2024Byrne Oil305861610$71.99$2.20
Sep 2024Byrne Oil1101001000$70.24$2.28
Aug 2024Byrne Oil1061610$76.68$1.99
Jul 2024Byrne Oil04050500$81.80$2.07
Jun 2024Byrne Oil1073730$79.77$2.54
May 2024Byrne Oil10061610$80.02$2.12
Apr 2024Byrne Oil28070700$85.35$1.60
Mar 2024Byrne Oil152963630$81.28$1.49
Feb 2024Byrne Oil15048480$77.25$1.72
Jan 2024Byrne Oil18046460$74.15$3.18
Dec 2023Byrne Oil7060600$71.90$2.52
Nov 2023Byrne Oil102951510$77.69$2.71
Oct 2023Byrne Oil7064640$85.64$2.98
Sep 2023Byrne Oil7050500$89.43$2.64
Aug 2023Byrne Oil4053530$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

OperatorByrne Oil CompanyFieldAdams (Duffer, Lower)CountyEastland County

Byrne Oil Company in Eastland County

All Byrne Oil Company leases →

Adams (Duffer, Lower) field

All leases in this field →

Leases within 10 km

Found by the location of their wells.

New drilling permits in Eastland County

We do not have coordinates for this lease, so these are the newest permits in its county.

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 18663, district 7B, 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.