Skip to content
Royalty Clerk

Texas oil lease

Producing

SWILLEY SAND /COCKFIELD/ UNIT

Swilley Sand /Cockfield/ Unit is an oil lease in Liberty County, Texas, operated by MBX Operating LLC in the Moss Hill, North (Cockfield) field.

5 wells

4,845bbl oil, last 12 months−32% vs prior year
Operator
MBX Operating LLC
County
Liberty County
Field
Moss Hill, North (Cockfield)
RRC lease
03-06366

Is your check right?

Check my statement

Where it sits

This county

Liberty CountyLibertySan JacintoChambersHardinJasperJeffersonMontgomeryTylerHarrisPolkLiberty County
Liberty County
Oil in Jul 2026
259 bbl
Reporting since
Jan 2020

Checks stopped on this lease?

  • Operator

    Operator changed: MBX Operating LLC took over from Cooper Oil & Gas, LLC in Dec 2024.

SourceRailroad Commission production, P-5 and P-4 records, data through Jul 2026.

See why checks stop on this lease

Production by month

Oil output fell 32% over the last 12 months

  • Oil (bars)
  • Last 12 months
Oil output fell 32% over the last 12 monthsMonthly oil production for SWILLEY SAND /COCKFIELD/ UNIT, Aug 2023 to Jul 2026. Oil output fell 32% over the last 12 months. 4,845 bbl in the 12 months through Jul 2026, against 7,075 bbl in the 12 months before.Last 12 months: 4,845 bblbbl per month02505007501,0001,250Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 32% over the last 12 monthsMonthly oil production for SWILLEY SAND /COCKFIELD/ UNIT, Aug 2023 to Jul 2026. Oil output fell 32% over the last 12 months. 4,845 bbl in the 12 months through Jul 2026, against 7,075 bbl in the 12 months before.Last 12 monthsbbl per month02505007501,0001,250Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

No gas disposition reported for this lease

The operator has not reported where the gas went in the months we hold.

Who has run this lease

The operator changed once, most recently in Dec 2024

Operators of this lease over timeCooper Oil & Gas, LLC, Jan 2020 to Nov 2024; MBX Operating LLC, Dec 2024 to Jul 20262020202120222023202420252026Changed Dec 2024Cooper Oil & Gas, LLCJan 2020 to Nov 2024MBX Operating LLCDec 2024 to now
Operators of this lease over timeCooper Oil & Gas, LLC, Jan 2020 to Nov 2024; MBX Operating LLC, Dec 2024 to Jul 20262020202120222023202420252026Changed Dec 2024Cooper Oil & Gas, LLCJan 2020 to Nov 2024MBX Operating LLCDec 2024 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

5 wells on this lease

Wells on SWILLEY SAND /COCKFIELD/ UNIT
API numberWell no.Status
42-291-003051Shut-in
42-291-003072Active
42-291-003093Active
42-291-003114Shut-in
42-291-817285Active

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Amj INCOilGathers50Aug 11, 2025–
Truth Resources, L.p.OilGathers50Aug 11, 2025–
Amj INCOilGathers100Apr 1, 2024Aug 11, 2025
Blue Jay Logistics INCOilGathers50Sep 1, 2022Apr 1, 2024
Energy Trans Crude Marketing LLCOilGathers50Oct 10, 2022Apr 1, 2024
Ace Gathering, Inc.OilGathers50Sep 1, 2022Oct 10, 2022
Ace Gathering, Inc.OilGathers100Jul 1, 2019Sep 1, 2022
Gulfmark Energy, Inc.OilGathers100Mar 1, 2019Jul 1, 2019

SourceRailroad Commission Form P-4 file, Sep 24, 2026 (source).

Who buys my oilOil price check

What the drilling permits say

  • Good to know

    The state has no unit acreage for this lease

    Ask the operator for the acreage on your well's division order and unit plat.

Check your decimal on this lease
Permits for Swilley Sand /Cockfield/ Unit
API numberWell no.Acreson the permit
42-291-003051–
42-291-003072–
42-291-003093–
42-291-003114–
42-291-817285–

SourceRailroad Commission drilling permits, Oct 3, 2026 (source 1, source 2).

Unit decimal checker

Estimate your royalty

36 months, newest first

Ledger for SWILLEY SAND /COCKFIELD/ UNIT
MonthOil producedbblOil soldbblWTI$/bblHenry Hub$/MMBtu
Jul 2026MBX Operating259176$80.46$2.89
Jun 2026MBX Operating271372$84.81$3.15
May 2026MBX Operating254182$102.13$2.94
Apr 2026MBX Operating156161$100.32$2.77
Mar 2026MBX Operating292347$91.38$3.04
Feb 2026MBX Operating431355$64.51$3.62
Jan 2026MBX Operating572669$60.04$7.72
Dec 2025MBX Operating211171$57.97$4.26
Nov 2025MBX Operating490665$60.06$3.79
Oct 2025MBX Operating606495$60.89$3.19
Sep 2025MBX Operating645814$63.96$2.97
Aug 2025MBX Operating658707$64.86$2.91
Jul 2025MBX Operating653537$68.39$3.20
Jun 2025MBX Operating631532$68.17$3.02
May 2025MBX Operating712692$62.17$3.12
Apr 2025MBX Operating727704$63.54$3.42
Mar 2025MBX Operating451498$68.24$4.12
Feb 2025MBX Operating597882$71.53$4.19
Jan 2025MBX Operating2110$75.74$4.13
Dec 2024MBX Operating00$70.12$3.01
Nov 2024Cooper Oil845832$69.95$2.12
Oct 2024Cooper Oil540535$71.99$2.20
Sep 2024Cooper Oil960721$70.24$2.28
Aug 2024Cooper Oil748865$76.68$1.99
Jul 2024Cooper Oil8601,058$81.80$2.07
Jun 2024Cooper Oil8961,015$79.77$2.54
May 2024Cooper Oil898683$80.02$2.12
Apr 2024Cooper Oil937848$85.35$1.60
Mar 2024Cooper Oil840994$81.28$1.49
Feb 2024Cooper Oil920673$77.25$1.72
Jan 2024Cooper Oil8911,057$74.15$3.18
Dec 2023Cooper Oil929910$71.90$2.52
Nov 2023Cooper Oil766672$77.69$2.71
Oct 2023Cooper Oil1,0011,165$85.64$2.98
Sep 2023Cooper Oil979825$89.43$2.64
Aug 2023Cooper Oil1,0641,182$81.39$2.58

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Oct 2, 2026.

How to check your stub against this lease Checks stopped on this lease? See the likely reasons

Do your checks match this lease?

Check my statement

Nearby

This lease belongs to

OperatorMBX Operating LLCFieldMoss Hill, North (Cockfield)CountyLiberty County

MBX Operating LLC in Liberty County

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

Moss Hill, North (Cockfield) field

No other producing leases in this field are in our data yet.

Leases within 10 km

Drilling permits within 10 km