SALLIE ANN (SPRABERRY-WOLFCAMP), 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
113
with a page here
Operators
20
Value, all time
$3.59 bn
90% of the register's 125
Discovered
2004-12-13
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 113 leases in this field that have a page here — 90% of the register's 125 — 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.
Wells
In the field
Producing
Produced in 2025
Also produced
Cumulative
Oil
599
374
382,457 bbl
1,980,174 mcfcasinghead
43,118,187 bblsince discovery
Gas
1
1
647 mcf
354 bblcondensate
6,905 mcfsince 1970
The discovery well's oil measured 41.8° API gravity, perforated at 10,097 ft.
Spacing rule
What the Commission requires of a well on this field.
Field number 79820800, from the Railroad Commission's field register. The register's own index resolves 125 leases and 849 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.