TOM OCONNOR (5300, EAST), 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
41
with a page here
Operators
1
Value, all time
$71.3 M
66% of the register's 62
Discovered
1952-07-15
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 41 leases in this field that have a page here — 66% of the register's 62 — 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
Oil400 bbl0 mcfcasinghead8,096 bblsince discovery
Gas600 mcf0 bblcondensate27,488,824 mcfsince 1970

This field filed no production for 2025. It remains on the Commission's schedules.

The discovery well's oil measured 33.6° API gravity.

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
GasB2003-02-28330 ft660 ft2006,000 ft

Commission remarks: ADDING NEW RULE 1 AND RENUMBERING RULES 1,2, AND 3 OF THE FIELD

County

Leases in this field

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

LeaseOperatorValue
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$14.4 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$9.4 M
REILLY, ANNIE ET VIRHILCORP ENERGY COMPANY$9.2 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$9.0 M
HEARD, CLEMENTHILCORP ENERGY COMPANY$5.3 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$4.2 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$3.4 M
REILLY, ANNIE ET VIRHILCORP ENERGY COMPANY$2.1 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$1.7 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$1.1 M
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$1.0 M
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$982 k
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$962 k
HEARD, CLAUDE E.HILCORP ENERGY COMPANY$921 k
O'CONNOR, THOMAS 'C'HILCORP ENERGY COMPANY$903 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$791 k
O'CONNOR, THOMAS 'C'HILCORP ENERGY COMPANY$750 k
M. F. LAMBERTHILCORP ENERGY COMPANY$624 k
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$610 k
BAUER, MARY CLAIRE ET VIRHILCORP ENERGY COMPANY$600 k
HEARD, MRS. FANNIE V. W.HILCORP ENERGY COMPANY$492 k
O'CONNOR, THOMAS 'A'HILCORP ENERGY COMPANY$399 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$314 k
REILLY, ANNIE ET VIRHILCORP ENERGY COMPANY$302 k
HEARD, FANNIE V. W. MRSHILCORP ENERGY COMPANY$238 k
HEARD, FANNIE V. W. MRSHILCORP ENERGY COMPANY$217 k
O'CONNOR, THOMAS 'C'HILCORP ENERGY COMPANY$201 k
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$171 k
HEARD, CLEMENTHILCORP ENERGY COMPANY$153 k
LAMBERT, M. F.HILCORP ENERGY COMPANY$130 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$113 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$107 k
HEARD, CLAUDE E. ET ALHILCORP ENERGY COMPANY$101 k
O'CONNOR, THOMAS "C"HILCORP ENERGY COMPANY$55 k
WILLIAMS, MAUDE ET AL "B"HILCORP ENERGY COMPANY$49 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$33 k
HEARD, IRA "A"HILCORP ENERGY COMPANY$31 k
LAMBERT GAS UNITHILCORP ENERGY COMPANY$27 k
O'CONNOR, THOMAS "A"HILCORP ENERGY COMPANY$14 k
O'CONNOR, THOMAS 'A'HILCORP ENERGY COMPANY$4 k
HEARD, CLAUDE E. ET ALHILCORP ENERGY COMPANY$2 k

Field number 90534600, from the Railroad Commission's field register. The register's own index resolves 62 leases and 65 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.