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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 20667

Producing

AMMANN

Ammann is an oil lease in Dimmit County, Texas, operated by Endeavor Natural Gas, LP in the Hugh Fitzsimmons (San Miguel) field. The Railroad Commission shows 158,829 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 7 wells

158,829bbl oil, last 12 months+25% vs prior year
Operator
Endeavor Natural Gas, LP
County
Dimmit County
Field
Hugh Fitzsimmons (San Miguel)
RRC lease
01-20667

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Where it sits

This county

Dimmit CountyDimmitLA SalleZavalaFrioMaverickDimmit County
Dimmit County · RRC district 01Open Dimmit County →
Gas, last 12 months
369,343 mcf
Oil in Jul 2026
8,516 bbl
Reporting to the state
since Jul 2022
Wells
7

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 25% over the last 12 months

158,829 bbl in the 12 months through Jul 2026, against 126,940 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Gas (line, right axis)
  • Last 12 months
Oil output rose 25% over the last 12 monthsMonthly oil production and gas for AMMANN, Aug 2023 to Jul 2026. Oil output rose 25% over the last 12 months. 158,829 bbl in the 12 months through Jul 2026, against 126,940 bbl in the 12 months before.Last 12 months: 158,829 bblbbl per monthmcf per month0010k20k20k40k30k60k40k80kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 25% over the last 12 monthsMonthly oil production and gas for AMMANN, Aug 2023 to Jul 2026. Oil output rose 25% over the last 12 months. 158,829 bbl in the 12 months through Jul 2026, against 126,940 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month0010k20k20k40k30k60k40k80kJan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 20667, 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.

96% of the gas went to a transmission line in the last 12 months

Flaring peaked at 19.5% of the gas in May 2024.

  • Transmission line (2)
  • Lease fuel (1)
  • Flared (4)
96% of the gas went to a transmission line in the last 12 monthsShare of AMMANN gas by disposition code each month, Aug 2023 to Jul 2026. 96% of the gas went to a transmission line in the last 12 months. Flaring peaked at 19.5% of the gas in May 2024.Share of the lease’s gas by disposition code, per month0%50%100%Flared 19.5%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
96% of the gas went to a transmission line in the last 12 monthsShare of AMMANN gas by disposition code each month, Aug 2023 to Jul 2026. 96% of the gas went to a transmission line in the last 12 months. Flaring peaked at 19.5% of the gas in May 2024.Share of gas by disposition code0%50%100%Flared 19.5%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, gas disposition by code, lease 20667, district 01. Reported through Jul 2026.

Transmission line (2)

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

Lease fuel (1)

Burned to run equipment on the lease. Not sold, so it pays no royalty. A few percent is normal.

Flared (4)

Burned off or vented, not sold. It pays no royalty. More than 3% in a month is worth watching.

Over the last 12 months, 1.5% of the gas was flared. 18 months went above 3%, which we mark in the ledger below.

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.

Endeavor Natural Gas, LP has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeEndeavor Natural Gas, LP, Jul 2022 to Jul 20262023202420252026Endeavor Natural Gas, LPJul 2022 to nowthrough Jul 2026
Operators of this lease over timeEndeavor Natural Gas, LP, Jul 2022 to Jul 20262023202420252026Endeavor Natural Gas, LPJul 2022 to nowthrough Jul 2026

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

Wells

7 wells on this lease

Every well the Railroad Commission links to oil lease 20667 in district 01. The API number is the state’s ID for a well.
Wells on AMMANN
API numberWell no.Status
42-127-384755502HActive
42-127-38678401HActive
42-127-38679403HActive
42-127-38898405HActive
42-127-388995504HActive
42-127-390095506HActive
42-127-390105508HActive

SourceTexas Railroad Commission Wellbore Query, district 01, lease 20667.

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

    Harvest Marketing & Trading, LLC gathers it.

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

  • Gas from oil wells

    Upstream Energy Services buys it; Texas Pipeline LLC gathers it.

    Upstream Energy Services buys it: 100% of it, on the list since Jul 13, 2022 · Texas Pipeline LLC gathers it: 100% of it, on the list since Jun 1, 2023

Companies that used to be listed: Gulfmark Energy, Inc. (gathers it, until Apr 1, 2025); Springfield Pipeline LLC (gathers it, until Jun 1, 2023); Plains Marketing, L.p. (gathers it, until Jun 1, 2023).

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

1,180 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
77 not plugged
Horizontal
7
First completion
Jul 13, 2022
Latest permit
Feb 5, 2025

7 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 Ammann
API numberWell no.Acreson the permit
42-127-390095506H1,180
42-127-390105508H1,180
42-127-38898405H1,180
42-127-388995504H1,180
42-127-38678401H1,180
42-127-38679403H1,180
42-127-384755502H1,180

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.

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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 AMMANN 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.

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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 AMMANN
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3Flaredmcf, code 4WTI$ per bblHenry Hub$ per MMBtu
Jul 2026Endeavor Natural8,5168,14425,39724,6830$80.46$2.89
Jun 2026Endeavor Natural8,7658,90323,17122,439183$84.81$3.15
May 2026Endeavor Natural9,1888,71624,44024,1410$102.13$2.94
Apr 2026Endeavor Natural9,1959,61625,15324,602446$100.32$2.77
Mar 2026Endeavor Natural10,52910,63628,59028,156181$91.38$3.04
Feb 2026Endeavor Natural11,04711,41027,33126,96696$64.51$3.62
Jan 2026Endeavor Natural12,18211,97328,79427,756379$60.04$7.72
Dec 2025Endeavor Natural13,82313,81532,45030,189573$57.97$4.26
Nov 2025Endeavor Natural14,08814,16632,69531,852221$60.06$3.79
Oct 2025Endeavor Natural17,82617,80040,94839,546384$60.89$3.19
Sep 2025Endeavor Natural20,31520,43241,48039,2451,152$63.96$2.97
Aug 2025Endeavor Natural23,35523,59438,89436,2641,976$64.86$2.91
Jul 2025Endeavor Natural20,00919,14521,90617,1823,857$68.39$3.20
Jun 2025Endeavor Natural4,5294,84017,36413,3183,164$68.17$3.02
May 2025Endeavor Natural6,8757,18023,41721,588982$62.17$3.12
Apr 2025Endeavor Natural9,2868,94823,80820,9692,019$63.54$3.42
Mar 2025Endeavor Natural8,5028,19824,31422,4101,052$68.24$4.12
Feb 2025Endeavor Natural9,6039,98925,74224,454593$71.53$4.19
Jan 2025Endeavor Natural10,0799,60325,52223,6691,178$75.74$4.13
Dec 2024Endeavor Natural13,06313,06033,97832,690431$70.12$3.01
Nov 2024Endeavor Natural14,29314,57835,73332,301648$69.95$2.12
Oct 2024Endeavor Natural13,79513,85830,94629,276418$71.99$2.20
Sep 2024Endeavor Natural6,4796,61624,86223,810242$70.24$2.28
Aug 2024Endeavor Natural10,42710,31038,15534,8952,104$76.68$1.99
Jul 2024Endeavor Natural12,54012,27043,17939,7002,544$81.80$2.07
Jun 2024Endeavor Natural21,67021,45566,82162,3993,429$79.77$2.54
May 2024Endeavor Natural29,52729,76658,24346,03811,382$80.02$2.12
Apr 2024Endeavor Natural5,3415,0385,7735,013250$85.35$1.60
Mar 2024Endeavor Natural4,7354,80711,4209,931857$81.28$1.49
Feb 2024Endeavor Natural7,4597,51720,93619,513580$77.25$1.72
Jan 2024Endeavor Natural9,90110,41927,67726,081607$74.15$3.18
Dec 2023Endeavor Natural10,46810,46728,05224,6921,368$71.90$2.52
Nov 2023Endeavor Natural12,03211,45327,66022,1663,215$77.69$2.71
Oct 2023Endeavor Natural12,23412,42434,87230,0452,229$85.64$2.98
Sep 2023Endeavor Natural15,80616,57838,93234,5872,771$89.43$2.64
Aug 2023Endeavor Natural20,10119,75244,95235,4078,473$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

OperatorEndeavor Natural Gas, LPFieldHugh Fitzsimmons (San Miguel)CountyDimmit County

Endeavor Natural Gas, LP in Dimmit County

No other producing leases from this operator in this county are in our data yet.

Hugh Fitzsimmons (San Miguel) 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 20667, 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.