Boring or penetrating the earth – Cutter element laterally shiftable below ground – With shifting mechanism spring biased to operative position
Patent
1987-08-18
1989-06-27
Kisliuk, Bruce M.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
With shifting mechanism spring biased to operative position
175281, 175284, 175286, 175321, 175325, 166 98, 166173, 166174, 166217, 166241, E21B 1032, E21B 1710, E21B 3120
Patent
active
048420824
ABSTRACT:
An apparatus for use in energy exploration is disclosed which is used where a radially expanding device is required, for example in a stabilizer, retriever or an underreamer. The apparatus comprises a support tubular member for connection to a drilling string, the member supporting a movable member which is axially movable along the member. A further member which may either be fixedly secured or also axially movable along the member is axially spaced from the movable member. The movable member and, optionally, the further member have tapered outer surfaces which cooperate with a taper on a radially movable member. The arrangement is such that movement of the movable member in the axial direction is such that the cooperating tapers cause the radially movable member to expand or contact in the radial direction. Various means for securing and performing radial movement are disclosed.
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Kisliuk Bruce M.
Smith International (North Sea) Limited
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