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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 15172

Producing

SWAIM 58

Swaim 58 is an oil lease in McMullen County, Texas, operated by Atlas Operating LLC in the San Miguel Creek (Wilcox Cons.) field. The Railroad Commission shows 1,630 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 3 wells

1,630bbl oil, last 12 months+83% vs prior year
Operator
Atlas Operating LLC
County
McMullen County
Field
San Miguel Creek (Wilcox Cons.)
RRC lease
01-15172

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Where it sits

This county

McMullen CountyMcMullenLA SalleAtascosaKarnesFrioLive OakMcMullen County
McMullen County · RRC district 01Open McMullen County →
Oil in Jul 2026
94 bbl
Reporting to the state
since Jan 2020
Wells
3
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 rose 83% over the last 12 months

1,630 bbl in the 12 months through Jul 2026, against 891 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Last 12 months
Oil output rose 83% over the last 12 monthsMonthly oil production for SWAIM 58, Aug 2023 to Jul 2026. Oil output rose 83% over the last 12 months. 1,630 bbl in the 12 months through Jul 2026, against 891 bbl in the 12 months before.Last 12 months: 1,630 bblbbl per month050100150200250Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 83% over the last 12 monthsMonthly oil production for SWAIM 58, Aug 2023 to Jul 2026. Oil output rose 83% over the last 12 months. 1,630 bbl in the 12 months through Jul 2026, against 891 bbl in the 12 months before.Last 12 monthsbbl per month050100150200250Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 15172, 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.

The operator changed once, most recently in Apr 2021

If your statements skip or shrink around a change, ask the new operator's owner relations department whether the month is in suspense.

Operators of this lease over timeEagle Oil & Gas Co., Jan 2020 to Mar 2021; Atlas Operating LLC, Apr 2021 to Jul 20262020202120222023202420252026Changed Apr 2021Eagle Oil & Gas Co.Jan 2020 to Mar 2021Atlas Operating LLCApr 2021 to now
Operators of this lease over timeEagle Oil & Gas Co., Jan 2020 to Mar 2021; Atlas Operating LLC, Apr 2021 to Jul 20262020202120222023202420252026Changed Apr 2021Eagle Oil & Gas Co.Jan 2020 to Mar 2021Atlas Operating LLCApr 2021 to now

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

Wells

3 wells on this lease

Every well the Railroad Commission links to oil lease 15172 in district 01. The API number is the state’s ID for a well.
Wells on SWAIM 58
API numberWell no.Status
42-311-338631Active
42-311-339342Active
42-311-341984Active

SourceTexas Railroad Commission Wellbore Query, district 01, lease 15172.

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. gathers it.

    100% of it, on the list since Feb 1, 2026

Companies that used to be listed: Gulfmark Energy, Inc. (gathers it, until Feb 1, 2026).

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

246 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
33 not plugged
Horizontal
0
First completion
Dec 26, 2005
Latest permit
Sep 6, 2011

A pooling certificate was filed

Your tract may share its production with neighbours in a pooled unit. The unit acres the operator uses to divide production can differ from the acreage on one permit.

The wells on this lease state different acreage

The permits state between 40 and 376 acres. Use the acres from your own division order for the well you are paid on.

Wells and acres on the permits for Swaim 58
API numberWell no.Acreson the permit
42-311-339342246
42-311-33863140
42-311-341984376

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 SWAIM 58 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 SWAIM 58
MonthOil producedbblOil soldbblWTI$ per bblHenry Hub$ per MMBtu
Jul 2026Atlas Operating940$80.46$2.89
Jun 2026Atlas Operating960$84.81$3.15
May 2026Atlas Operating206284$102.13$2.94
Apr 2026Atlas Operating1070$100.32$2.77
Mar 2026Atlas Operating138278$91.38$3.04
Feb 2026Atlas Operating125166$64.51$3.62
Jan 2026Atlas Operating1220$60.04$7.72
Dec 2025Atlas Operating1380$57.97$4.26
Nov 2025Atlas Operating125179$60.06$3.79
Oct 2025Atlas Operating142316$60.89$3.19
Sep 2025Atlas Operating1790$63.96$2.97
Aug 2025Atlas Operating1580$64.86$2.91
Jul 2025Atlas Operating940$68.39$3.20
Jun 2025Atlas Operating79320$68.17$3.02
May 2025Atlas Operating780$62.17$3.12
Apr 2025Atlas Operating740$63.54$3.42
Mar 2025Atlas Operating76131$68.24$4.12
Feb 2025Atlas Operating780$71.53$4.19
Jan 2025Atlas Operating810$75.74$4.13
Dec 2024Atlas Operating86171$70.12$3.01
Nov 2024Atlas Operating60171$69.95$2.12
Oct 2024Atlas Operating660$71.99$2.20
Sep 2024Atlas Operating560$70.24$2.28
Aug 2024Atlas Operating630$76.68$1.99
Jul 2024Atlas Operating60312$81.80$2.07
Jun 2024Atlas Operating1850$79.77$2.54
May 2024Atlas Operating360$80.02$2.12
Apr 2024Atlas Operating720$85.35$1.60
Mar 2024Atlas Operating66259$81.28$1.49
Feb 2024Atlas Operating1580$77.25$1.72
Jan 2024Atlas Operating820$74.15$3.18
Dec 2023Atlas Operating78109$71.90$2.52
Nov 2023Atlas Operating32131$77.69$2.71
Oct 2023Atlas Operating730$85.64$2.98
Sep 2023Atlas Operating810$89.43$2.64
Aug 2023Atlas Operating84174$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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Upload your statements for SWAIM 58. We compare volumes, prices, deductions and timing with the state record and give you the exact question to ask Atlas Operating LLC.

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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

OperatorAtlas Operating LLCFieldSan Miguel Creek (Wilcox Cons.)CountyMcMullen County

Atlas Operating LLC in McMullen County

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San Miguel Creek (Wilcox Cons.) field

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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 15172, 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.

FAQ

Questions about SWAIM 58

Who operates the SWAIM 58 lease?

The Railroad Commission lists Atlas Operating LLC (operator number 036587) as the operator of this lease in McMullen County, Texas. The operator history on this page shows earlier operators and when the record changed.

How much has the SWAIM 58 lease produced?

The lease reported 1,630 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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