A logging tool assembly comprises an elongate sensor assembly, a plurality of sensor transportation apparatuses for transporting the elongate sensor assembly through a wellbore, and an orientation structure. The sensor transportation apparatuses are spaced apart along the elongate sensor assembly. Each sensor transportation apparatus comprises an engagement structure to connect the sensor transportation apparatus to the elongate sensor assembly and prevent relative rotation between the sensor transportation apparatus and the elongate sensor assembly, and one or more pairs of wheels arranged to rotate on an axis of rotation substantially perpendicular to a longitudinal axis of the elongate sensor assembly. The axes of rotation of the pairs of wheels of said transportation apparatuses are parallel. The orientation structure is connected to the elongate sensor assembly to prevent relative rotation between the orientation structure and the elongate sensor assembly. The orientation structure comprises at least one radially extending orientation projection. In a transverse outline of the logging tool assembly a said orientation projection extends between the pair of wheels so that the shortest distance between a centre of gravity of the elongate sensor assembly and the wellbore wall is when the pair of wheels of the transportation apparatus is in contact with the wellbore wall.

A device for injecting a fluid into a mechanical system that may undergo heating, comprising at least one body containing a thermally triggered charge generating combustion gas, ignition of the charge being able to be triggered under the action of an ignition command and/or under the effect of a heat contribution, from a heating area of the body toward the charge, a reservoir containing the fluid, means for fastening the device to the mechanical system, the fastening means adapted to put the reservoir in fluid communication with the mechanical system, and means for delivering pressurized fluid outside the reservoir through the action, directly or through intermediate means, of the combustion gases. Within the device, the fastening means comprise at least one injection sleeve provided with an outer thread coated with an anti-loosening adhesive film. The invention also relates to a mechanical system equipped with at least one such device.

A device for injecting a fluid into a mechanical system that may undergo heating, comprising at least one body containing a thermally triggered charge generating combustion gas, ignition of the charge being able to be triggered under the action of an ignition command and/or under the effect of a heat contribution, from a heating area of the body toward the charge, a reservoir containing the fluid, means for fastening the device to the mechanical system, the fastening means adapted to put the reservoir in fluid communication with the mechanical system, and means for delivering pressurized fluid outside the reservoir through the action, directly or through intermediate means, of the combustion gases. Within the device, the fastening means comprise at least one injection sleeve provided with an outer thread coated with an anti-loosening adhesive film. The invention also relates to a mechanical system equipped with at least one such device.

A sensor transportation apparatus to convey a sensor assembly through a wellbore. The apparatus comprising has an engagement structure to connect the sensor transportation apparatus to the sensor assembly, and one or more 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. An orientation structure defining a form having a transverse outline which has a rotational centre, wherein the rotational centre is offset from a centroidal axis of the elongate sensor assembly.

A sensor transportation apparatus to convey a sensor assembly through a wellbore. The apparatus comprising has an engagement structure to connect the sensor transportation apparatus to the sensor assembly, and one or more 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. An orientation structure defining a form having a transverse outline which has a rotational center, wherein the rotational center is offset from a centroidal axis of the elongate sensor assembly.

Disclosed is a supply device for supplying a consumer with a viscous medium, in particular a lubricant supply device, including at least a reservoir for the viscous medium including a follower piston which includes a ring seal at its circumferential edges and is supported on the viscous medium and which separates the reservoir into a space supplied with a viscous medium and an air space, and a feed pump for feeding the viscous medium from the reservoir to a medium outlet, such that further in the reservoir at least one opening is provided which serves to receive a ventilation apparatus via which the reservoir is in air-exchanging contact with the exterior surroundings, such that the opening is arranged in the reservoir such that in a determined filling state of the reservoir the ring seal at least partially overrides the opening so that the space supplied with a viscous medium is in fluidic connection with the opening.

Disclosed is a supply device for supplying a consumer with a viscous medium, in particular a lubricant supply device, including at least a reservoir for the viscous medium including a follower piston which includes a ring seal at its circumferential edges and is supported on the viscous medium and which separates the reservoir into a space supplied with a viscous medium and an air space, and a feed pump for feeding the viscous medium from the reservoir to a medium outlet, such that further in the reservoir at least one opening is provided which serves to receive a ventilation apparatus via which the reservoir is in air-exchanging contact with the exterior surroundings, such that the opening is arranged in the reservoir such that in a determined filling state of the reservoir the ring seal at least partially overrides the opening so that the space supplied with a viscous medium is in fluidic connection with the opening.

A lubricant delivery apparatus for installation on a device that includes a moving component that is actuated by an actuating fluid from an actuating fluid source is disclosed. The apparatus includes a lubricant supply reservoir and a pump operably coupled to the reservoir for receiving a pre-determined amount of lubricant from the reservoir and for discharging the pre-determined amount of lubricant from the apparatus. The apparatus has a non-actuated state, wherein the predetermined amount of lubricant is disposed within the pump and an actuated state wherein the predetermined amount of lubricant is discharged from the pump. While the apparatus is installed on the device, the pump is operably coupled to the actuating fluid source such that actuation of the moving component is with effect that the apparatus transitions from the non-actuated state to the actuated state such that the predetermined amount of lubricant is delivered to the moving component.

A lubricant delivery apparatus for installation on a device that includes a moving component that is actuated by an actuating fluid from an actuating fluid source is disclosed. The apparatus includes a lubricant supply reservoir and a pump operably coupled to the reservoir for receiving a pre-determined amount of lubricant from the reservoir and for discharging the pre-determined amount of lubricant from the apparatus. The apparatus has a non-actuated state, wherein the predetermined amount of lubricant is disposed within the pump and an actuated state wherein the predetermined amount of lubricant is discharged from the pump. While the apparatus is installed on the device, the pump is operably coupled to the actuating fluid source such that actuation of the moving component is with effect that the apparatus transitions from the non-actuated state to the actuated state such that the predetermined amount of lubricant is delivered to the moving component.

A reciprocating pump comprises a cylinder, an inlet check valve, a piston, an outlet check valve and a purge circuit. The cylinder has a first end and a second end. The inlet check valve is disposed proximate a first end of the cylinder. The piston is disposed within the cylinder between the inlet check valve and the second end. The outlet check valve is disposed within the piston. The purge circuit extends across the inlet check valve and the outlet check valve to fluidly couple the first end and the second end.