CPC E21B 17/1021 (2013.01) [E21B 23/04 (2013.01); E21B 43/117 (2013.01); E21B 43/119 (2013.01)] | 14 Claims |
1. A centralizing device configured to centralize/decentralize an associated tool in a well, the centralizing device comprising:
a body that extends along a longitudinal axis, the body having a bore that extends from one end to another end of the body;
a first piston shaped as a cylinder and provided around a central portion of the body;
a second piston shaped as a cylinder and provided around the central portion of the body;
a bridge provided around the central portion of the body, between the first and second pistons; and
a pair of arms, each arm being attached with one end to a corresponding one of the first and second pistons and with another end to each other,
wherein the second piston, the bridge, and the central portion of the body define a first sealed chamber containing a gas that exerts a pressure tending to separate the first piston and the second piston.
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