SHANNON (SAN ANDRES), District 7C, Texas

A field is the Railroad Commission's unit of geology and of regulation. Its spacing rule is what decides how many wells an acreage can hold.

Leases
66
with a page here
Operators
13
Value, all time
$103.2 M
72% of the register's 92
Discovered
1943-03-01
Oil and gas

Our estimate: volumes the operator filed with the Commission, valued at the EIA first-purchase price for that month. It is not a payment anyone received, and it is not a royalty. It sums the 66 leases in this field that have a page here — 72% of the register's 92 — so it understates the field.

Production, 2025

The Railroad Commission's Oil and Gas Annual Report for 2025, its most recent. These are the state's figures for the whole field, not ours.

WellsIn the fieldProducingProduced in 2025Also producedCumulative
Oil20011340,189 bbl0 mcfcasinghead14,698,931 bblsince discovery
Gas100 mcf0 bblcondensate14,576 mcfsince 1970

The discovery well's oil measured 25.0° API gravity, perforated at 2,406 ft.

Hydrogen sulphide

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
OilB2011-05-24330 ft933 ft402,100 ft
OilO2011-05-24330 ft933 ft201,500 ft
GasB330 ft933 ft400 ft

Commission remarks: SEE COMM. LETTER 1/22/65 FOR TESTING

County

Leases in this field

Every lease here files this field's number with the Commission and has a page on this site.

LeaseOperatorValue
SHANNON ESTATE -B-CLARK OIL CO.$56.3 M
HOOVER, A. C.CLARK OIL CO.$8.3 M
HOOVER, A. C. -A-CLARK OIL CO.$8.2 M
SHANNON ESTATECLARK OIL CO.$6.0 M
SHANNON WATERFLOOD UNITCLARK OIL CO.$3.4 M
TODD RANCHCLARK OIL CO.$2.4 M
SHANNON, J. M., EST. -E-SUNDOWN ENERGY LP$2.2 M
SHANNON, J. M., EST. -A-SUNDOWN ENERGY LP$2.2 M
GRAHAM -B-REMUDA OPERATING COMPANY$1.5 M
BIG STATE RANCH "10"HOOVER PETROLEUM COMPANY, LLC$1.4 M
GRAHAM -A-REMUDA OPERATING COMPANY$1.2 M
SOHIO-SHANNONCLARK OIL CO.$1.1 M
MOORE, ETAL, FEE NO. 1CLARK OIL CO.$801 k
SHANNON, J. M. ESTATE -B-SUNDOWN ENERGY LP$693 k
SHANNON /SOHIOSUNDOWN ENERGY LP$675 k
BIG STATE RANCHHOOVER PETROLEUM COMPANY, LLC$652 k
GRAHAM -C-REMUDA OPERATING COMPANY$571 k
SHANNONSUNDOWN ENERGY LP$496 k
SHANNON-PHILLIPSCLARK OIL CO.$489 k
HOOVER, A. C.PHARAOH OIL & GAS, INC.$377 k
SHANNONM.A.R.S. ENERGY$354 k
HOOVER, A. C. -A-TROJAN OIL COMPANY, LLC$295 k
SHANNON, J. M., ESTATE -C-SUNDOWN ENERGY LP$292 k
SHANNON 2SUNDOWN ENERGY LP$272 k
BIG STATE RANCH "10" AENDEAVOR ENERGY RESOURCES L.P.$248 k
SHANNON, J. M. EST. -B-SUNDOWN ENERGY LP$240 k
HOOVER, A. C. -E-PHARAOH OIL & GAS, INC.$210 k
SHANNON-DYCOCLARK OIL CO.$207 k
GRAHAM, WM. A.SUNDOWN ENERGY LP$206 k
BIG STATE RANCH INC.HOOVER PETROLEUM COMPANY, LLC$193 k
HOOVER, A. C. "A"PHARAOH OIL & GAS, INC.$191 k
SHANNON -V-SUNDOWN ENERGY LP$152 k
HOOVER, A. C. -B-PHARAOH OIL & GAS, INC.$137 k
SHANNON 'A'SUNDOWN ENERGY LP$136 k
HOOVER, A. C. -K-HOOVER PETROLEUM COMPANY, LLC$131 k
SHANNAMCLARK OIL CO.$114 k
SHANNAM #3CLARK OIL CO.$97 k
BIG STATE RANCH "2"HOOVER PETROLEUM COMPANY, LLC$91 k
SHANNON ESTATE "A"SUNDOWN ENERGY LP$72 k
HOOVER, A. C. -M-HOOVER PETROLEUM COMPANY, LLC$67 k
HOOVER -G-ENERGY PRODUCTION CORPORATION$65 k
SHANNON, J. M. EST. "E"M.A.R.S. ENERGY$62 k
BISHOP, CHARLES H.HOOVER PETROLEUM COMPANY, LLC$55 k
SHANNON SOHIO "A"ENERGY PRODUCTION CORPORATION$51 k
BIG STATE RANCH "4"HOOVER PETROLEUM COMPANY, LLC$44 k
HOOVER "A"PHARAOH OIL & GAS, INC.$40 k
HOOVER, A. C. -D-ENERGY PRODUCTION CORPORATION$36 k
MARTIN, MARY LYNN ROYALTY TRUSTRSK OIL COMPANY$34 k
HOOVER, A. C. -I-ENERGY PRODUCTION CORPORATION$34 k
SHANNON - DYCOCLARK OIL CO.$28 k
SHANNON ESTATE -F-SUNDOWN ENERGY LP$23 k
SHANNON SOHIO "B"ENERGY PRODUCTION CORPORATION$18 k
SHANNON -C-ENERGY PRODUCTION CORPORATION$15 k
HOOVER -3-O & O OPERATORS, LLC.$10 k
SHANNON /AMERADA/RSK OIL COMPANY$9 k
HOOVER -16-HOOVER PETROLEUM COMPANY, LLC$7 k
SHANNON, J. M., ESTATE -D-RSK OIL COMPANY$7 k
SHANNON, J. M. ESTATE -D-CLARK OIL CO.$5 k
TODD STATECLARK OIL CO.$4 k
HOOVER, A. C. "C"ENERGY PRODUCTION CORPORATION$2 k
HOOVER, A. C. -H-SOUTHWEST ROYALTIES, INC.$491
HOOVER, A. C. -B-RSK OIL COMPANY$475
HOOVER -13-ENERGY PRODUCTION CORPORATION$270
GRAHAMRSK OIL COMPANY$15
BIG STATE RANCH -B-SUNMARK SERVICES CORPORATION
BIG STATE RANCHSUNMARK SERVICES CORPORATION

Field number 82663568, from the Railroad Commission's field register. The register's own index resolves 92 leases and 473 wells to this field by name, over every lease in Texas rather than only those with a page here. It resolves a lease by NAME and refuses an ambiguous one, so it counts nothing for a field that shares its name with another — which is why the lease count above comes from the field number instead.