Abstract: A centering device is connected to a rotating sensor assembly located at the bottom end of a tool string. The device comprises a centraliser with a plurality of arms spaced circumferentially apart around a longitudinal central axis of the device, and a shaft with a mount for fixing the shaft to the rotating sensor assembly. The shaft extends below the rotating sensor assembly, and the shaft and rotating sensor assembly rotate together on the longitudinal central axis. The centraliser is rotationally mounted to the shaft to allow the shaft to rotate within the centraliser and with the centraliser positioned below the rotating sensor assembly.

Abstract: A device for centering a sensor assembly in a bore comprises a plurality of arm assemblies spaced circumferentially apart around a central longitudinal axis of the device and connected between first and second support members. Each arm assembly comprises 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, and the first and second arms pivotally connected together via a third pivot joint having a third pivot axis. The first pivot axis and the third pivot axis are located on a first side of a plane coincident with the central longitudinal axis of the device, and the second pivot axis is located on an opposite second side of the plane to achieve an improved mechanical advantage.

Abstract: A centraliser comprises arm assemblies pivotally connected between first and second support members. Each arm assembly comprises a first arm pivotally attached to one of the first and second support members by a first pivot joint having a first pivot axis, a second arm assembly pivotally attached to the other one of the first and second support members by a second pivot joint having a second pivot axis, the first and second arms pivotally attached together via a third pivot joint having a third pivot axis. The first arm comprises a fork section extending around opposite sides of the respective first or second support member to position the first pivot axis radially within an outer diameter of a mandrel on which one or both support members move.

Abstract: A sensor transportation apparatus to convey a sensor assembly through a bore comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, one or more wheels each arranged to rotate on a bearing about an axis of rotation substantially perpendicular to a longitudinal axis of the bore in use, and a lubrication system. The lubrication system comprises a reservoir with an elastomer diaphragm, with an exterior side of the elastomer diaphragm subjected to an ambient bore pressure.

Abstract: A device for transporting a sensor assembly down a bore of a known diameter comprises a pair of wheels offset in a radial direction by a first radial distance from a longitudinal axis of the sensor assembly and at least one eccentric weight. The first radial distance and a lateral distance between the wheels and a diameter of the wheels configures the device so that, in use, a longitudinal axis of the sensor assembly is substantially coincident with a longitudinal axis of the bore when the wheels are in contact with a wall of the bore.

Abstract: A centraliser comprises arm assemblies pivotally connected between first and second support members. Each arm assembly comprises a first arm pivotally attached to one of the first and second support members by a first pivot joint having a first pivot axis, a second arm assembly pivotally attached to the other one of the first and second support members by a second pivot joint having a second pivot axis, the first and second arms pivotally attached together via a third pivot joint having a third pivot axis. The first arm comprises a fork section extending around opposite sides of the respective first or second support member to position the first pivot axis radially within an outer diameter of a mandrel on which one or both support members move.

Abstract: A sensor transportation apparatus to convey an elongate sensor assembly through a wellbore, the sensor transportation apparatus comprises a pair of axles and a pair of wheels corresponding with the pair of axles with each wheel mounted on a respective said axle to rotate about an axis of rotation perpendicular to a longitudinal axis of the elongate sensor assembly. A protection structure extends longitudinally around each wheel to prevent a side of the wheel from contacting a wall of the wellbore. Each wheel extends above and below the protection structure to contact a side of the wellbore.

Abstract: A device for centering a sensor assembly in a bore comprises a first support and a second support axially spaced apart along a central longitudinal axis of the device, one or both of the first and second supports configured to slide axially along the central longitudinal axis, and a plurality of arm assemblies, each arm assembly pivotally connected to the first and second supports by a respective pivot joint. One or both supports comprise an adjustment mechanism configured to set a maximum outer diameter of the device.

Abstract: A device for transporting a tool string down a bore comprises a body with a connection at one or both ends for in-line connection in a tool string, and a pair of wheels mounted to rotate relative to the body on a rotational axis perpendicular to a longitudinal axis. The device defines an outer form configured to orient the device in the bore during use so that a radial extremity of the wheels contacts a low side of a wall of the bore. The device further comprises an adjustment mechanism configured to provide for an angular orientation of the outer form of the device relative to an adjacent tool string section to be set, and a locking mechanism configured to lock the angular orientation relative to the adjacent tool string section so that the outer form of the device orients the device and adjacent tool string section in the bore.

Abstract: A device for centering a sensor assembly in a bore has three or more bow-spring assemblies spaced circumferentially apart around a longitudinal axis of the device and pivotally attached between first and second support members. Each bow-spring assembly comprises two or more bow-springs stacked together in a bow-spring stack, with each bow-spring in the bow-spring stack extending between first and second pivot members pivotally attached to the first and second support members.

Abstract: A device for centering a sensor assembly in a bore comprises a plurality of arm assemblies connected first and second support members. Each arm assembly comprises a first arm pivotally connected to the first support member, a second arm pivotally connected to the second support member, and a third arm pivotally connected between the first and second arms. The third arm is pivotally connected to a third support member positioned axially between the first and second support members. The third arm extends across the longitudinal axis of the device so that in use each arm assembly contacts opposite sides of the bore to centralise the sensor assembly in the bore.

Abstract: A device for centering a sensor assembly in a bore comprises a plurality of arm assemblies spaced circumferentially apart around a central longitudinal axis of the device and connected between first and second support members. Each arm assembly comprises 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, and the first and second arms pivotally connected together via a third pivot joint having a third pivot axis. The first pivot axis and the third pivot axis are located on a first side of a plane coincident with the central longitudinal axis of the device, and the second pivot axis is located on an opposite second side of the plane to achieve an improved mechanical advantage.

Abstract: A device for centering a sensor assembly in a bore comprises a first support and a second support axially spaced apart along a central longitudinal axis of the device, one or both of the first and second supports configured to slide axially along the central longitudinal axis, and a plurality of arm assemblies, each arm assembly pivotally connected to the first and second supports by a respective pivot joint. One or both supports comprise an adjustment mechanism configured to set a maximum outer diameter of the device.

Abstract: A device for transporting a tool string down a bore comprises a single unitary part mandrel comprising a connection at each end of the mandrel for in-line connection of the device in a tool string and a single unitary part annular body rotationally mounted to the mandrel to rotate relative to the mandrel about a longitudinal axis of the mandrel or tool string. A pair of wheels is rotationally mounted to the annular body to rotate relative to the mandrel on a rotational axis perpendicular to the longitudinal axis of the tool string. A collar is releasably coupled to the mandrel to allow for assembly of the annular body onto the mandrel from one end of the mandrel when the collar is disassembled from the mandrel and axially retain the annular body on the mandrel when the collar is assembled to the mandrel.

Abstract: A device for transporting a sensor assembly along a bore comprises an axle extending through a body of the device and mounted to rotate on a rotational axis perpendicular to a central longitudinal axis of the device. A wheel fixed to each end of the axle. The device has a conduit through the body for accommodating an electrical conductor to extend through the device from end-to-end. The conduit comprises a non-linear portion extending around the axle between the ends of the device.

Abstract: A sensor transportation apparatus to convey an elongate sensor assembly through a wellbore, the sensor transportation apparatus comprises a pair of axles and a pair of wheels corresponding with the pair of axles with each wheel mounted on a respective said axle to rotate about an axis of rotation perpendicular to a longitudinal axis of the elongate sensor assembly. A protection structure extends longitudinally around each wheel to prevent a side of the wheel from contacting a wall of the wellbore. Each wheel extends above and below the protection structure to contact a side of the wellbore.

Abstract: A centraliser comprises a mandrel, a first support member, a second support member, and a plurality of arm assemblies connected between the first and second support members. Each arm assembly comprises a first arm pivotally connected to the first support member at a first pivot axis and a second arm pivotally connected to the second support member at a second pivot axis, and the first and second arms pivotally connected together at a third pivot axis. The mandrel comprises a plurality of facets spaced apart around an outer surface of the mandrel to rotationally key the first and/or second support member to the mandrel, and each arm assembly is arranged so that the third pivot axis is located on a first side of a plane coincident with a central axis of the device and the first and second pivot axes are located on an opposite second side of the plane.

Abstract: The disclosure relates to a sensor transportation apparatus to convey an elongate sensor assembly through a wellbore. The sensor transportation apparatus comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, and a pair of wheels arranged to rotate about an axis of rotation substantially perpendicular to a longitudinal axis of the sensor assembly when the transportation apparatus is connected to the sensor assembly, and an orientation structure comprising at least one orientation projection, in a transverse outline of the sensor transportation apparatus a said orientation projection extending between the pair of wheels so that the shortest distance between a centre of mass of the elongate sensor assembly and the wellbore wall is when the pair of wheels are in contact with the wellbore wall.

Abstract: A device for centering a sensor assembly in a bore comprises a plurality of arm assemblies connected first and second support members. Each arm assembly comprises a first arm pivotally connected to the first support member, a second arm pivotally connected to the second support member, and a third arm pivotally connected between the first and second arms. The third arm is pivotally connected to a third support member positioned axially between the first and second support members. The third arm extends across the longitudinal axis of the device so that in use each arm assembly contacts opposite sides of the bore to centralise the sensor assembly in the bore.

Abstract: A centraliser comprises arm assemblies pivotally connected between first and second support members. Each arm assembly comprises a first arm and a first pivot joint having a first pivot axis, a second arm and a second pivot joint having a second pivot axis, the first and second arms pivotally attached together via a third pivot joint having a third pivot axis. The arm assemblies are arranged in diametrically opposed pairs. In some embodiments the first arm comprises a fork section to position the first pivot axis coincident with the central longitudinal axis of the device, or so that the first pivot axis and the third pivot axis are positioned on opposite sides of a plane coincident with the central longitudinal axis of the device.