Apparatus for centralizing pipe in a wellbore
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United States of America Patent
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Jan 10, 1995
Issued Date -
N/A
app pub date -
Apr 20, 1993
filing date -
Sep 16, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A system for centralizing casing pipe in a wellbore includes lateral pistons in the side wall of the casing string which are movable by force applied to their inner end, from a retracted position within the maximum exterior profile of the casing pipe string to a predetermined extended position which will move the casing pipe string toward a central position in the borehole. Various well operations can be performed using the pistons in addition to the centralizing function. When a predetermined deploying force is applied to the pistons, they are released from their retracted position for movement to a fixed extended position. The deploying force is accurately determined by a simple retaining mechanism involving a snap ring and groove on the pistons.
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