OCONNOR RANCH (FRIO CONS.), District 02, 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
81
with a page here
Operators
8
Value, all time
$231.2 M
94% of the register's 86
Discovered
2000-08-09
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 81 leases in this field that have a page here — 94% of the register's 86 — 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
Oil000 bbl0 mcfcasinghead224 bblsince discovery
Gas148303 mcf0 bblcondensate35,367,178 mcfsince 1970

The discovery well's oil measured 40.0° API gravity, perforated at 3,944 ft.

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
GasB2000-09-28467 ft1,200 ft400 ft

Commission remarks: TWO PART ALLOCATION FORMULA.

County

Leases in this field

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

LeaseOperatorValue
RIVER RANCH CCHARRO OPERATING, L.L.C.$17.0 M
RIVER RANCHCHARRO OPERATING, L.L.C.$11.2 M
RIVER RANCH DCHARRO OPERATING, L.L.C.$9.6 M
RIVER RANCHCHARRO OPERATING, L.L.C.$8.1 M
THWING GAS UNITAMERICO ENERGY RESOURCES, LLC$8.1 M
RIVER RANCHCHARRO OPERATING, L.L.C.$8.0 M
RIVER RANCH CCHARRO OPERATING, L.L.C.$7.5 M
O'CONNOR RANCH "B"PROLINE ENERGY RESOURCES INC$7.4 M
RIVER RANCHCHARRO OPERATING, L.L.C.$7.2 M
O'CONNOR RANCHPROLINE ENERGY RESOURCES INC$7.2 M
O'CONNOR RANCH "R"PROLINE ENERGY RESOURCES INC$6.8 M
RIVER RANCH ECHARRO OPERATING, L.L.C.$6.0 M
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$6.0 M
O'CONNOR RANCH "B"PROLINE ENERGY RESOURCES INC$5.6 M
RIVER RANCH BCHARRO OPERATING, L.L.C.$5.5 M
O'CONNOR RANCHPROLINE ENERGY RESOURCES INC$4.7 M
RIVER RANCH ECHARRO OPERATING, L.L.C.$4.4 M
DONOGHUEEDGE PETROLEUM OPER. CO., INC.$4.3 M
O'CONNOR RANCHPROLINE ENERGY RESOURCES INC$4.2 M
DONOGHUESMITH OPERATING AND MGMT CO.$4.0 M
O'CONNOR RANCH "T"PROLINE ENERGY RESOURCES INC$3.7 M
RIVER RANCH ACHARRO OPERATING, L.L.C.$3.6 M
O'CONNOR RANCH "B"PROLINE ENERGY RESOURCES INC$3.4 M
O'CONNOR RANCH "B"CHEVRON U. S. A. INC.$3.4 M
HANLEY HICKSEDGE PETROLEUM OPER. CO., INC.$3.3 M
O'CONNOR COUNTSEDGE PETROLEUM OPER. CO., INC.$3.3 M
O'CONNOR RANCH "R"MILAGRO EXPLORATION, LLC$3.2 M
O'CONNOR COUNTSEDGE PETROLEUM OPER. CO., INC.$3.1 M
DONOGHUEEDGE PETROLEUM OPER. CO., INC.$3.0 M
RIVER RANCH "F"CHARRO OPERATING, L.L.C.$3.0 M
BURROWS GAS UNITAMERICO ENERGY RESOURCES, LLC$2.9 M
RIVER RANCH BCHARRO OPERATING, L.L.C.$2.9 M
DONOGHUE GAS UNITEDGE PETROLEUM OPER. CO., INC.$2.7 M
O'CONNOR RANCHPROLINE ENERGY RESOURCES INC$2.5 M
O'CONNOR RANCH "Q"CHEVRON U. S. A. INC.$2.1 M
RIVER RANCHCHARRO OPERATING, L.L.C.$2.0 M
RIVER RANCH "F"CHARRO OPERATING, L.L.C.$2.0 M
MCCAMPBELLMILAGRO EXPLORATION, LLC$2.0 M
RIVER RANCHCHARRO OPERATING, L.L.C.$2.0 M
RIVER RANCHCHARRO OPERATING, L.L.C.$1.9 M
O'CONNOR RANCH "R"CHEVRON U. S. A. INC.$1.7 M
RIVER RANCHCHARRO OPERATING, L.L.C.$1.6 M
O'CONNOR RANCHPROLINE ENERGY RESOURCES INC$1.6 M
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$1.6 M
O'CONNOR RANCH "B"CHEVRON U. S. A. INC.$1.6 M
O'CONNOR RANCHKCS RESOURCES, INC.$1.5 M
RIVER RANCHCHARRO OPERATING, L.L.C.$1.5 M
RIVER RANCHCHARRO OPERATING, L.L.C.$1.5 M
RIVER RANCHCHARRO OPERATING, L.L.C.$1.5 M
O'CONNOR RANCH "G"CHEVRON U. S. A. INC.$1.4 M
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$1.3 M
O'CONNOR RANCHKCS RESOURCES, INC.$1.2 M
DONOGHUE FSMITH OPERATING AND MGMT CO.$1.2 M
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$1.1 M
O'CONNOR RANCH "O"CHEVRON U. S. A. INC.$1.0 M
O'CONNOR RANCHKCS RESOURCES, INC.$983 k
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$975 k
RIVER RANCHCHARRO OPERATING, L.L.C.$868 k
RIVER RANCH BCHARRO OPERATING, L.L.C.$744 k
O'CONNOR RANCH "M"MILAGRO EXPLORATION, LLC$742 k
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$721 k
O'CONNOR RANCH "J"CHEVRON U. S. A. INC.$655 k
HENSLEY, J. W. ET AL, TR.CHEVRON U. S. A. INC.$645 k
O'CONNOR RANCHKCS RESOURCES, INC.$634 k
DONOGHUEAMERICO ENERGY RESOURCES, LLC$629 k
O'CONNOR RANCH "C"CHEVRON U. S. A. INC.$619 k
O'CONNOR RANCHKCS RESOURCES, INC.$433 k
DONOGHUEEDGE PETROLEUM OPER. CO., INC.$374 k
O'CONNOR COUNTSEDGE PETROLEUM OPER. CO., INC.$356 k
RIVER RANCH ACHARRO OPERATING, L.L.C.$270 k
RIVER RANCH ECHARRO OPERATING, L.L.C.$268 k
PARKS RANCHCHARRO OPERATING, L.L.C.$250 k
O'CONNOR RANCHMILAGRO EXPLORATION, LLC$215 k
PARKS RANCHCHARRO OPERATING, L.L.C.$192 k
O'CONNOR RANCHKCS RESOURCES, INC.$82 k
PARKS RANCHCHARRO OPERATING, L.L.C.$63 k
O'CONNOR COUNTSEDGE PETROLEUM OPER. CO., INC.$58 k
O'CONNOR RANCHKCS RESOURCES, INC.$55 k
RIVER RANCHCHARRO OPERATING, L.L.C.$51 k
DONOGHUEEDGE PETROLEUM OPER. CO., INC.$13 k
PARKS RANCHCHARRO OPERATING, L.L.C.$12 k

Field number 66710200, from the Railroad Commission's field register. The register's own index resolves 86 leases and 86 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.