3661205 is referenced by 65 patents and cites 4 patents.

An illustrative embodiment of the invention includes upper and lower anchoring members for temporarily securing a well tool in a well bore. The upper and lower anchoring members are pivotally supported from the central body member of the tool and respectively coupled to upper and lower movable slide blocks or driven pistons. The slide blocks are, in turn, moved by a two phase hydraulic transmission system whose pressure is controlled by a movable driving piston having two different cross sectional piston areas. The driving piston's motion is provided by a reversible electric motor via a gear box and threaded driving screw. This arrangement provides for low pressure fast moving initial deployment of the anchoring means followed by subsequent high pressure, low displacement anchoring force.

Title
Well tool anchoring system
Application Number
05/134,775
Publication Number
3661205
Application Date
April 16, 1971
Publication Date
May 9, 1972
Inventor
Belorgey Roger
Assignee
Schlumberger Technology Corporation
IPC
E21b 23/00
E21b 43/00
G01V 11/00
E21B 47/00
E21B 47/09
E21B 23/04
E21B 23/00
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