Wells – Processes – Placing fluid into the formation
Patent
1975-07-01
1977-02-01
Novosad, Stephen J.
Wells
Processes
Placing fluid into the formation
166245, 166250, E21B 4326
Patent
active
040057500
ABSTRACT:
The orientation of hydraulically-induced fractures in relatively deep subterranean earth formations is normally confined to vertical projections along a plane parallel to the maximum naturally occurring (tectonic) compressive stress field. It was found that this plane of maximum compressive stress may be negated and, in effect, re-oriented in a plane projecting generally orthogonal to the original tectonic stress plane by injecting liquid at a sufficiently high pressure into a wellbore fracture oriented in a plane parallel to the plane of tectonic stress for the purpose of stressing the surrounding earth formation in a plane generally orthogonal to the plane of tectonic stress. With the plane of maximum compressive stress re-oriented due to the presence of the induced compressive stress, liquid under pressure is injected into a second wellbore disposed within the zone influenced by the induced compressive stress but at a location in the earth formation laterally spaced from the fracture in the first wellbore for effecting a fracture in the second wellbore along a plane generally orthogonal to the fracture in the first wellbore.
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Carlson Dean E.
Larcher Earl L.
Novosad Stephen J.
The United States of America as represented by the United States
Zachry David S.
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