GRETA (4400), 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
9
Value, all time
$217.7 M
49% of the register's 63
Discovered
1963-05-22
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 — 49% of the register's 63 — 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
Oil561883,928 bbl31,394 mcfcasinghead58,151,205 bblsince discovery
Gas000 mcf0 bblcondensate2,466,218 mcfsince 1970

The discovery well's oil measured 24.0° API gravity, perforated at 4,400 ft.

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
GasB2020-12-08330 ft0 ft4099,999 ft
GasO2020-12-08330 ft0 ft2599,999 ft
OilB2020-12-08330 ft0 ft4099,999 ft
OilO2020-12-08330 ft0 ft2599,999 ft

Commission remarks: CHANGED MIN. ACRES FROM 25 TO 40, AND ADDED OPTIONAL ACRES.

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, J. F. B.DORCHESTER OPERATING COMPANY LLC$41.3 M
HEARD, FANNIE V. W.DORCHESTER OPERATING COMPANY LLC$31.5 M
O'BRIEN, J. M.DORCHESTER OPERATING COMPANY LLC$20.8 M
HEARD, J. F. B.- TEXGRETA OPERATING COMPANY LLC$19.9 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$19.6 M
HEARD, F. V. W.GRETA OPERATING COMPANY LLC$14.8 M
OBRIEN, J. J., -B-GRETA OPERATING COMPANY LLC$10.1 M
OCONNOR, THOS.GRETA OPERATING COMPANY LLC$9.3 M
LAMBERT, M. F.HILCORP ENERGY COMPANY$8.8 M
OBRIEN, J. J., -A-GRETA OPERATING COMPANY LLC$4.4 M
J.M. O'BRIEN JLBSOUTH TEXAS OPERATING COMPANY$4.3 M
OBRIEN, J. M.SOUTH TEXAS OPERATING COMPANY$4.2 M
OBRIEN, J. J., -A-GRETA OPERATING COMPANY LLC$4.1 M
OBRIEN,J.M.,-A- EAST 101 AC. 6DEWBRE PETROLEUM CORPORATION$3.7 M
OBRIEN, J. M.PRIMROSE OPERATING COMPANY$3.4 M
O'CONNORGRETA OPERATING COMPANY LLC$3.1 M
O'CONNOR, THOMASDORCHESTER OPERATING COMPANY LLC$2.7 M
J.F.B. HEARD-ARCOGRETA OPERATING COMPANY LLC$2.6 M
OCONNOR, THOS.ACOCK/ANAQUA OPERATING CO., LP$2.0 M
OCONNOR, T.ACOCK/ANAQUA OPERATING CO., LP$1.7 M
HEARD, J. F. B.ACOCK/ANAQUA OPERATING CO., LP$1.7 M
OBRIEN, J. M., -B-ACOCK/ANAQUA OPERATING CO., LP$1.6 M
J.M. O'BRIEN 'J'GRETA OPERATING COMPANY LLC$669 k
JFB HEARD - HTEX #2HGRETA OPERATING COMPANY LLC$540 k
JFB HEARD - HTEX #1HGRETA OPERATING COMPANY LLC$275 k
THOMAS O'CONNORACOCK/ANAQUA OPERATING CO., LP$224 k
OBRIEN, J. M., -D-EXXON CORP.$111 k
OBRIEN, J. M., -B-DEWBRE PETROLEUM CORPORATION$30 k
W. J. FOX "A"HILCORP ENERGY COMPANY$7 k
OBRIEN, J. M., -B-GRETA OPERATING COMPANY LLC$2 k
OBRIEN, J. M., -J & L-CHILTON ENERGY$566

Field number 36867780, from the Railroad Commission's field register. The register's own index resolves 63 leases and 296 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.