TOM OCONNOR, 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
51
with a page here
Operators
6
Value, all time
$106.2 M
52% of the register's 98
Discovered
1934-12-31
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 51 leases in this field that have a page here — 52% of the register's 98 — 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
Oil47250,694 bbl340 mcfcasinghead333,450,882 bblsince discovery
Gas600 mcf0 bblcondensate16,180,949 mcfsince 1970

The discovery well's oil measured 38.0° API gravity, perforated at 5,950 ft.

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
GasB2005-05-10150 ft300 ft100 ft
OilB2005-05-10150 ft300 ft100 ft

Commission remarks: AND FIELD CLASSIFIED AS SALVAGE.

County

Leases in this field

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

LeaseOperatorValue
OCONNOR, THOMAS -A-HILCORP ENERGY COMPANY$36.8 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$18.5 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$8.9 M
OCONNOR, THOS. -D-HILCORP ENERGY COMPANY$5.5 M
HEARD, CLAUDE E., ET ALHILCORP ENERGY COMPANY$5.4 M
OCONNOR, THOMAS -E-T-C OIL COMPANY, LLC$3.7 M
WILLIAMS, MAUDE, ETAL -A-HILCORP ENERGY COMPANY$3.7 M
LAMBERT, M.F.H & D OPERATING COMPANY$2.8 M
WILLIAMS, MAUDE, ETAL -B-HILCORP ENERGY COMPANY$2.4 M
O'CONNOR, THOMAS 'B'HILCORP ENERGY COMPANY$2.2 M
HEARD, FANNIE V. W., MRS.HILCORP ENERGY COMPANY$2.1 M
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$1.8 M
WILSON HEARD 'B'HILCORP ENERGY COMPANY$1.7 M
OCONNOR, THOMAS -C-HILCORP ENERGY COMPANY$1.5 M
OCONNOR, THOMAS -B-T-C OIL COMPANY, LLC$1.4 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$1.3 M
OCONNOR, THOMAS -D-T-C OIL COMPANY, LLC$1.2 M
WILLIAMS, MAUDE ET AL -C-HILCORP ENERGY COMPANY$1.2 M
HEARD, IRA "B"HILCORP ENERGY COMPANY$666 k
HEARD, IRA 'A'HILCORP ENERGY COMPANY$484 k
HEARD, WILSON "B"HILCORP ENERGY COMPANY$454 k
HEARD, FANNIE V.W. MRS.HILCORP ENERGY COMPANY$448 k
LAMBERT, M. F.HILCORP ENERGY COMPANY$327 k
HEARD, WILSON "B"HILCORP ENERGY COMPANY$279 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$191 k
LAMBERT, M. F.HILCORP ENERGY COMPANY$171 k
HEARD, WILSON "A"HILCORP ENERGY COMPANY$127 k
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$125 k
ANNIE REILLYHILCORP ENERGY COMPANY$107 k
BAUER, MARY CLAIRE ET VIRHILCORP ENERGY COMPANY$100 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$96 k
O'CONNOR, THOMAS 'C'HILCORP ENERGY COMPANY$89 k
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$86 k
BAUER, MARY CLAIRE ET VIRHILCORP ENERGY COMPANY$80 k
NORDAN, L. A.-OCONNOR, THOS. ESTT-C OIL COMPANY, LLC$76 k
HEARD, FANNIE V. W., MRS.HILCORP ENERGY COMPANY$51 k
NORDAN & MORRIS-THOS. O'CONNORT - C OIL COMPANY$40 k
HEARD, CLAUDE E. ET ALHILCORP ENERGY COMPANY$28 k
HEARD, FANNIE V. W. MRS.HILCORP ENERGY COMPANY$27 k
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$25 k
WILLIAMS, MAUDE ET AL "A"QUINTANA PET. CORP.$19 k
LAMBERT, M. F.DEVON ENERGY PRODUCTION CO, L.P.$14 k
MAUDE WILLIAMS ET AL 'A'HILCORP ENERGY COMPANY$13 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$10 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$9 k
HEARD, IRA 'A'HILCORP ENERGY COMPANY$5 k
O'CONNER, THOMAS -A-T-C OIL COMPANY, LLC$3 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$3 k
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$964
WILLIAMS, MAUDE ET AL "A"QUINTANA PET. CORP.
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY

Field number 90534001, from the Railroad Commission's field register. The register's own index resolves 98 leases and 672 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.