KEYSTONE (SAN ANDRES), District 08, 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
13
Value, all time
$96.2 M
63% of the register's 65
Discovered
1960-07-05
Oil

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 — 63% of the register's 65 — 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
Oil52911,178 bbl932 mcfcasinghead5,836,743 bblsince discovery

The discovery well's oil measured 37.4° API gravity, perforated at 4,465 ft.

Hydrogen sulphide

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
OilB1994-10-31330 ft660 ft402,100 ft
OilO1994-10-31330 ft660 ft202,100 ft

Commission remarks: 4. ALLOCATION BASED ON 100% ACREAGE.

County

Leases in this field

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

LeaseOperatorValue
WALTON, J. B., -C-HILCORP ENERGY COMPANY$33.0 M
WADDELLFORMENTERA OPERATIONS LLC$18.6 M
MCCUTCHEN, W.A.TEKE PRODUCTION LLC$8.1 M
K.D.PALADIN PETROLEUM III, L.L.C.$7.2 M
EAST KEYSTONE(SAN A HOLT UNIT)FORMENTERA OPERATIONS LLC$2.9 M
TAYLOR,MACK"A"GRUY PETROLEUM MANAGEMENT CO.$2.9 M
TAYLOR, MACK "B"GRUY PETROLEUM MANAGEMENT CO.$2.7 M
MOSS,JOHN H. "A"GRUY PETROLEUM MANAGEMENT CO.$2.1 M
MOSS,JOHN H.GRUY PETROLEUM MANAGEMENT CO.$2.1 M
MOSS-TAYLOR UNITGRUY PETROLEUM MANAGEMENT CO.$1.7 M
STONEGATEPALADIN PETROLEUM III, L.L.C.$1.7 M
MOSS, J. H. "B"GRUY PETROLEUM MANAGEMENT CO.$1.4 M
WALTON ESTATEGRUY PETROLEUM MANAGEMENT CO.$1.3 M
WARD, M. B.GRUY PETROLEUM MANAGEMENT CO.$1.1 M
TAYLOR, MACKGRUY PETROLEUM MANAGEMENT CO.$982 k
JENKINSFULFER OIL AND CATTLE CO.$933 k
MOSS, J. H. -C-GRUY PETROLEUM MANAGEMENT CO.$904 k
HANKS-TAYLOR UNITPRIZE OPERATING COMPANY$669 k
TRINITY "A" UNITFORMENTERA OPERATIONS LLC$631 k
HANKS, NELLIE "A"GRUY PETROLEUM MANAGEMENT CO.$547 k
J.J. PERKINS "C"FORMENTERA OPERATIONS LLC$539 k
TAYLOR 'A' MOSS UNITGRUY PETROLEUM MANAGEMENT CO.$531 k
HANKS-WARD UNITCIMAREX ENERGY CO. OF COLORADO$528 k
SMITH-WALTON UNITGRUY PETROLEUM MANAGEMENT CO.$424 k
WALTON ESTATE "A"FORMENTERA OPERATIONS LLC$378 k
TAYLOR-MOSS UNITPIONEER RESOURCES PRODUCING, L.P$369 k
HANKS "A" UNITGRUY PETROLEUM MANAGEMENT CO.$306 k
HANKS, NELLIEGRUY PETROLEUM MANAGEMENT CO.$258 k
BRADISH MOSS UNITGRUY PETROLEUM MANAGEMENT CO.$241 k
TAYLOR HANKS "A" UNITGRUY PETROLEUM MANAGEMENT CO.$206 k
UTF MORETONPALADIN PETROLEUM III, L.L.C.$203 k
SMITH, LUCYGRUY PETROLEUM MANAGEMENT CO.$138 k
TAYLOR-SMITH UNITGRUY PETROLEUM MANAGEMENT CO.$134 k
M. E. CRUM UNITGRUY PETROLEUM MANAGEMENT CO.$119 k
RUST 24FORMENTERA OPERATIONS LLC$118 k
TAYLOR HANKS UNITGRUY PETROLEUM MANAGEMENT CO.$80 k
KEYSTONE CATTLE CO. 14TILTED J OIL COMPANY$40 k
WALTON, J. B.HILCORP ENERGY COMPANY$31 k
KEYSTONE CATTLE CO.BCP RESOURCES, LLC$18 k
TAYLOR, MACKHALLWOOD PETROLEUM, INC.$10 k
WALTON, J. B. -A-XTO ENERGY INC.$5 k

Field number 49129594, from the Railroad Commission's field register. The register's own index resolves 65 leases and 165 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.