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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 10747

Producing

COLUNGA

Colunga is an oil lease in Atascosa County, Texas, operated by Texas Secondary Oil Corporation in the Somerset field. The Railroad Commission shows 303 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 8 wells

303bbl oil, last 12 months−35% vs prior year
Operator
Texas Secondary Oil Corporation
County
Atascosa County
Field
Somerset
RRC lease
01-10747

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County · RRC district 01Open Atascosa County →
Oil in Jul 2026
2 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 35% over the last 12 months

303 bbl in the 12 months through Jul 2026, against 469 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Last 12 months
Oil output fell 35% over the last 12 monthsMonthly oil production for COLUNGA, Aug 2023 to Jul 2026. Oil output fell 35% over the last 12 months. 303 bbl in the 12 months through Jul 2026, against 469 bbl in the 12 months before.Last 12 months: 303 bblbbl per month0255075100Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 35% over the last 12 monthsMonthly oil production for COLUNGA, Aug 2023 to Jul 2026. Oil output fell 35% over the last 12 months. 303 bbl in the 12 months through Jul 2026, against 469 bbl in the 12 months before.Last 12 monthsbbl per month0255075100Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 10747, 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.

Texas Secondary Oil Corporation has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeTexas Secondary Oil Corporation, Jan 2020 to Jul 20262020202120222023202420252026Texas Secondary Oil Corporati…Jan 2020 to nowthrough Jul 2026
Operators of this lease over timeTexas Secondary Oil Corporation, Jan 2020 to Jul 20262020202120222023202420252026Texas Secondary Oil CorporationJan 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 10747 in district 01. The API number is the state’s ID for a well.
Wells on COLUNGA
API numberWell no.Status
42-013-317781Active
42-013-318097Active
42-013-318106Active
42-013-318133Active
42-013-318154Active
42-013-318192Active
42-013-318415Active
42-013-333008Active

SourceTexas Railroad Commission Wellbore Query, district 01, lease 10747.

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

    Dks Transport LLC, Firebird Bulk Carriers, Inc., Plains Marketing, L.p. and Shell Trading (Us) Company gather it.

    Dks Transport LLC gathers it: 25% of it, on the list since Jun 26, 2021 · Firebird Bulk Carriers, Inc. gathers it: 25% of it, on the list since Jun 26, 2021 · Plains Marketing, L.p. gathers it: 25% of it, on the list since Jun 26, 2021 · Shell Trading (Us) Company gathers it: 25% of it, on the list since Jun 26, 2021

Companies that used to be listed: Firebird Bulk Carriers, Inc. (gathers it, until Jun 26, 2021); Plains Marketing, L.p. (gathers it, until Jun 26, 2021); Shell Trading (Us) Company (gathers it, until Jun 26, 2021); Firebird Bulk Carriers, Inc. (gathers it, until Jun 8, 2021); Shell Trading (Us) Company (gathers it, until Jun 8, 2021); Enterprise Crude Oil LLC (gathers it, until Sep 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

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
88 not plugged
Horizontal
0
First completion
Jan 21, 1983
Latest permit
Mar 26, 1985

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 Colunga
API numberWell no.Acreson the permit
42-013-33300834
42-013-31813334
42-013-31815434
42-013-31819234
42-013-31841534
42-013-31809734
42-013-31810634
42-013-31778134

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 COLUNGA 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 COLUNGA
MonthOil producedbblOil soldbblWTI$ per bblHenry Hub$ per MMBtu
Jul 2026Texas Secondary20$80.46$2.89
Jun 2026Texas Secondary20$84.81$3.15
May 2026Texas Secondary30$102.13$2.94
Apr 2026Texas Secondary20$100.32$2.77
Mar 2026Texas Secondary20$91.38$3.04
Feb 2026Texas Secondary30$64.51$3.62
Jan 2026Texas Secondary5155$60.04$7.72
Dec 2025Texas Secondary530$57.97$4.26
Nov 2025Texas Secondary530$60.06$3.79
Oct 2025Texas Secondary60155$60.89$3.19
Sep 2025Texas Secondary310$63.96$2.97
Aug 2025Texas Secondary870$64.86$2.91
Jul 2025Texas Secondary1152$68.39$3.20
Jun 2025Texas Secondary490$68.17$3.02
May 2025Texas Secondary840$62.17$3.12
Apr 2025Texas Secondary21135$63.54$3.42
Mar 2025Texas Secondary190$68.24$4.12
Feb 2025Texas Secondary680$71.53$4.19
Jan 2025Texas Secondary380$75.74$4.13
Dec 2024Texas Secondary25162$70.12$3.01
Nov 2024Texas Secondary310$69.95$2.12
Oct 2024Texas Secondary800$71.99$2.20
Sep 2024Texas Secondary480$70.24$2.28
Aug 2024Texas Secondary5150$76.68$1.99
Jul 2024Texas Secondary340$81.80$2.07
Jun 2024Texas Secondary370$79.77$2.54
May 2024Texas Secondary510$80.02$2.12
Apr 2024Texas Secondary18146$85.35$1.60
Mar 2024Texas Secondary120$81.28$1.49
Feb 2024Texas Secondary180$77.25$1.72
Jan 2024Texas Secondary180$74.15$3.18
Dec 2023Texas Secondary380$71.90$2.52
Nov 2023Texas Secondary330$77.69$2.71
Oct 2023Texas Secondary380$85.64$2.98
Sep 2023Texas Secondary17151$89.43$2.64
Aug 2023Texas Secondary260$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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This lease belongs to

OperatorTexas Secondary Oil CorporationFieldSomersetCountyAtascosa County

Texas Secondary Oil Corporation in Atascosa County

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Somerset field

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Leases within 10 km

Found by the location of their wells.

New drilling permits in Atascosa 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 10747, 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.