US 11,933,112 B2
Hydraulically powered centralizer device for borehole and method
Dennis Roessler, Fort Worth, TX (US)
Assigned to GEODYNAMICS, INC., Millsap, TX (US)
Filed by GEODYNAMICS, INC., Millsap, TX (US)
Filed on Jun. 1, 2021, as Appl. No. 17/335,351.
Claims priority of provisional application 63/035,899, filed on Jun. 8, 2020.
Prior Publication US 2021/0381322 A1, Dec. 9, 2021
Int. Cl. E21B 17/10 (2006.01); E21B 23/04 (2006.01); E21B 43/117 (2006.01); E21B 43/119 (2006.01)
CPC E21B 17/1021 (2013.01) [E21B 23/04 (2013.01); E21B 43/117 (2013.01); E21B 43/119 (2013.01)] 14 Claims
OG exemplary drawing
 
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.