Texas oil lease

Producing

SIMPSON-MANN "A"

Name: SIMPSON-MANN "A" monthly oil and gas production, Tom Green County, Texas
Creator: Texas Railroad Commission

Simpson-Mann "A" is an oil lease in Tom Green County, Texas, operated by Core Petro, LLC in the Atkinson, W. (San Angelo) field.

6 wells

26bbl oil, last 12 months−7% vs prior year

Operator: Core Petro, LLC
County: Tom Green County
Field: Atkinson, W. (San Angelo)
RRC lease: 7C-12127

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Where it sits

This county

Tom Green County

Oil in Jul 2026: 4 bbl
Reporting since: Jan 2020

Checks stopped on this lease?

Sales
No sales reported for the last 12 months of state data (through Jul 2026).

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

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Production by month

Oil output fell 7% over the last 12 months

Oil (bars)
Last 12 months

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 Jun 2021

Core Petro, LLC Jun 2021 to now
Armor Petroleum, Inc. Jan 2020 to May 2021

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

6 wells on this lease

Wells on SIMPSON-MANN "A"
API number	Well no.	Status
42-451-31749	5	Active
42-451-31757	6	Active
42-451-31769	7	Active
42-451-31771	10	Shut-in
42-451-31853	9	Active
42-451-31874	8	Active

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
Company	Product	Role	Share%	From	Until
Energy Trans Crude Marketing LLC	Oil	Gathers	100	Jul 1, 2021	–
Sunoco Ptnrs. Mktg.&terminals LP	Oil	Gathers	100	Apr 1, 2002	Jul 1, 2021

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

Who buys my oil Oil price check

47.40 acres on the newest permit

Good to know
The wells on this lease state different acreage
The permits state between 45.6 and 59.48 acres. Use the acres from your own division order for the well you are paid on.
Worth asking
A substandard-acreage flag is in the permit records
The RRC permit records include a substandard-acreage flag. Ask which acreage applies to your well and how it was used in your decimal.
Worth asking
A Rule 37 case is listed
The RRC permit records list a Rule 37 case. This does not establish your royalty share. Ask for the permit and unit plat for your well.

Check your decimal on this lease

Permits for Simpson-Mann "A"
API number	Well no.	Permit issued	Completed	Acreson the permit	Type
42-451-31874	8	May 4, 1988	Jan 1, 1989	47.40	Vertical
42-451-31853	9	Mar 10, 1988	Jul 8, 1988	46.37	Vertical
42-451-31771	10	Apr 3, 1987	Jun 2, 1987	59.48	Vertical
42-451-31769	7	Jan 12, 1987	Mar 12, 1987	51.60	Vertical
42-451-31757	6	Nov 24, 1986	Feb 13, 1987	51	Vertical
42-451-31749	5	Sep 26, 1986	Feb 13, 1987	45.60	Vertical

SourceRailroad Commission drilling permits, Sep 26, 2026 (source 1, source 2).

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36 months, newest first

Ledger for SIMPSON-MANN "A"
Month	Operator	Oil producedbbl	WTI$/bbl	Henry Hub$/MMBtu
Jul 2026Core Petro,	Core Petro, LLC	4	$80.46	$2.89
Jun 2026Core Petro,	Core Petro, LLC	2	$84.81	$3.15
May 2026Core Petro,	Core Petro, LLC	2	$102.13	$2.94
Apr 2026Core Petro,	Core Petro, LLC	4	$100.32	$2.77
Mar 2026Core Petro,	Core Petro, LLC	2	$91.38	$3.04
Feb 2026Core Petro,	Core Petro, LLC	1	$64.51	$3.62
Jan 2026Core Petro,	Core Petro, LLC	2	$60.04	$7.72
Dec 2025Core Petro,	Core Petro, LLC	2	$57.97	$4.26
Nov 2025Core Petro,	Core Petro, LLC	3	$60.06	$3.79
Oct 2025Core Petro,	Core Petro, LLC	1	$60.89	$3.19
Sep 2025Core Petro,	Core Petro, LLC	2	$63.96	$2.97
Aug 2025Core Petro,	Core Petro, LLC	1	$64.86	$2.91
Jul 2025Core Petro,	Core Petro, LLC	3	$68.39	$3.20
Jun 2025Core Petro,	Core Petro, LLC	3	$68.17	$3.02
May 2025Core Petro,	Core Petro, LLC	2	$62.17	$3.12
Apr 2025Core Petro,	Core Petro, LLC	3	$63.54	$3.42
Mar 2025Core Petro,	Core Petro, LLC	4	$68.24	$4.12
Feb 2025Core Petro,	Core Petro, LLC	3	$71.53	$4.19
Jan 2025Core Petro,	Core Petro, LLC	2	$75.74	$4.13
Dec 2024Core Petro,	Core Petro, LLC	1	$70.12	$3.01
Nov 2024Core Petro,	Core Petro, LLC	2	$69.95	$2.12
Oct 2024Core Petro,	Core Petro, LLC	2	$71.99	$2.20
Sep 2024Core Petro,	Core Petro, LLC	1	$70.24	$2.28
Aug 2024Core Petro,	Core Petro, LLC	2	$76.68	$1.99
Jul 2024Core Petro,	Core Petro, LLC	2	$81.80	$2.07
Jun 2024Core Petro,	Core Petro, LLC	2	$79.77	$2.54
May 2024Core Petro,	Core Petro, LLC	2	$80.02	$2.12
Apr 2024Core Petro,	Core Petro, LLC	1	$85.35	$1.60
Mar 2024Core Petro,	Core Petro, LLC	1	$81.28	$1.49
Feb 2024Core Petro,	Core Petro, LLC	2	$77.25	$1.72
Jan 2024Core Petro,	Core Petro, LLC	5	$74.15	$3.18
Dec 2023Core Petro,	Core Petro, LLC	2	$71.90	$2.52
Nov 2023Core Petro,	Core Petro, LLC	3	$77.69	$2.71
Oct 2023Core Petro,	Core Petro, LLC	1	$85.64	$2.98
Sep 2023Core Petro,	Core Petro, LLC	2	$89.43	$2.64
Aug 2023Core Petro,	Core Petro, LLC	3	$81.39	$2.58

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

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