US 11,913,291 B2
Device for centering a sensor assembly in a bore
Stephen Peter McCormick, Auckland (NZ); and Benno Frank Smit, Auckland (NZ)
Assigned to PETROMAC IP LIMITED, Auckland (NZ)
Appl. No. 17/437,649
Filed by PETROMAC IP LIMITED, Auckland (NZ)
PCT Filed Aug. 5, 2021, PCT No. PCT/NZ2021/050123
§ 371(c)(1), (2) Date Sep. 9, 2021,
PCT Pub. No. WO2022/031176, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 766888 (NZ), filed on Aug. 6, 2020.
Prior Publication US 2022/0298870 A1, Sep. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 17/10 (2006.01); E21B 23/14 (2006.01)
CPC E21B 17/1021 (2013.01) [E21B 17/1057 (2013.01); E21B 23/14 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A device for centering a sensor assembly in a bore, the device comprising:
a mandrel;
a first support member and a second support member axially spaced apart along a central longitudinal axis of the device, one or both of the first and second support members is adapted to move axially along the mandrel;
a plurality of arm assemblies spaced circumferentially apart around the central longitudinal axis of the device and connected between the first and second support members, each arm assembly comprising:
a first arm pivotally connected to the first support member by a first pivot joint having a first pivot axis,
a second arm pivotally connected to the second support member by a second pivot joint having a second pivot axis, the first and second arms pivotally connected together via a third pivot joint having a third pivot axis,
wherein the mandrel comprises a plurality of facets spaced apart around an outer surface of the mandrel and the first and/or second support member has a corresponding plurality of facets spaced apart around an inner surface of the support member, to rotationally key the first and/or second support member to the mandrel, and
the third pivot axis is located on a first side of a plane coincident with the central longitudinal axis of the device and the first pivot axis and the second pivot axis are located on an opposite second side of the plane.