TOM OCONNOR (5450 SAND), 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
31
with a page here
Operators
4
Value, all time
$42.4 M
79% of the register's 39
Discovered
1963-10-02
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 31 leases in this field that have a page here — 79% of the register's 39 — 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
Oil251955 bbl202 mcfcasinghead5,107,807 bblsince discovery
Gas600 mcf0 bblcondensate3,710,358 mcfsince 1970

The discovery well's oil measured 32.0° API gravity, perforated at 5,540 ft.

Spacing rule

What the Commission requires of a well on this field.

The register files no field rule here. Statewide spacing applies.

County

Leases in this field

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

LeaseOperatorValue
WILLIAMS, MAUDE, ET AL -A-HILCORP ENERGY COMPANY$13.5 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$6.8 M
OCONNOR, THOMAS -A-HILCORP ENERGY COMPANY$6.7 M
HEARD, FANNIE V. W. MRS.HILCORP ENERGY COMPANY$2.2 M
O'CONNOR, THOMAS -C-HILCORP ENERGY COMPANY$2.1 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$2.1 M
WILLIAMS, MAUDE, ET AL -B-HILCORP ENERGY COMPANY$1.9 M
HEARD, FANNIE V. W. MRS.HILCORP ENERGY COMPANY$1.8 M
O'CONNOR, THOMAS,-C-HILCORP ENERGY COMPANY$1.1 M
LAMBERT, MARY F.HILCORP ENERGY COMPANY$725 k
REILLY, ANNIE ET VIRHILCORP ENERGY COMPANY$558 k
HEARD, FANNIE V. W. MRS.HILCORP ENERGY COMPANY$502 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$398 k
O'CONNOR, THOMAS 'C'HILCORP ENERGY COMPANY$300 k
OCONNOR, THOMAS -A-T-C OIL COMPANY, LLC$291 k
BAUER, MARY CLAIRE ET VIRHILCORP ENERGY COMPANY$242 k
IRA HEARD "B"HILCORP ENERGY COMPANY$228 k
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$168 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$127 k
HEARD, CLAUDE E. ET ALHILCORP ENERGY COMPANY$98 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$85 k
HEARD, FANNIE V. W. MRS.HILCORP ENERGY COMPANY$69 k
O' CONNOR, THOMAS "C"QUINTANA PET. CORP.$68 k
O'CONNOR, THOMAS -C-HILCORP ENERGY COMPANY$62 k
HEARD, FANNIE V.W. MRS.HILCORP ENERGY COMPANY$50 k
WILLIAMS, MAUDE ET AL -C-HILCORP ENERGY COMPANY$33 k
HEARD, CLAUDE E. ET ALHILCORP ENERGY COMPANY$14 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$5 k
O'CONNOR, THOMAS "C"QUINTANA PET. CORP.$2 k
HEARD, MRS. FANNIE V. W.QUINTANA PET. CORP.$2 k
LAMBERT, M. F.DEVON ENERGY PRODUCTION CO, L.P.

Field number 90534700, from the Railroad Commission's field register. The register's own index resolves 39 leases and 84 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.