A downhole tool extending in a longitudinal direction includes a tool housing; an arm assembly movable between a retracted position and a projecting position in relation to the tool housing; and an arm activation assembly arranged in the tool housing for moving the arm assembly between the retracted
A downhole tool extending in a longitudinal direction includes a tool housing; an arm assembly movable between a retracted position and a projecting position in relation to the tool housing; and an arm activation assembly arranged in the tool housing for moving the arm assembly between the retracted position and the projecting position. The arm activation assembly has a piston chamber extending in the longitudinal direction of the downhole tool, and a piston member arranged inside the piston chamber and movable in the longitudinal direction of the downhole tool. The arm activation assembly further includes a torque member with a first fluid channel for supplying hydraulic fluid from a pump to the arm assembly, the torque member being connected with the arm assembly. The torque member is rotated by the movement of the piston member, whereby the arm assembly is moved.
대표청구항▼
1. A downhole tool extending in a longitudinal direction, comprising: a tool housing;an arm assembly movable between a retracted position and a projecting position in relation to the tool housing; andan arm activation assembly arranged in the tool housing for moving the arm assembly between the retr
1. A downhole tool extending in a longitudinal direction, comprising: a tool housing;an arm assembly movable between a retracted position and a projecting position in relation to the tool housing; andan arm activation assembly arranged in the tool housing for moving the arm assembly between the retracted position and the projecting position, the arm activation assembly comprising: a piston chamber extending in the longitudinal direction of the downhole tool, anda piston member arranged inside the piston chamber and movable in the longitudinal direction of the downhole tool, wherein the arm activation assembly further comprises a torque member comprising a first fluid channel for supplying hydraulic fluid from a pump to the arm assembly, the torque member being connected with the arm assembly and wherein the torque member is rotated by the movement of the piston member, whereby the arm assembly is moved. 2. A downhole tool according to claim 1, wherein the torque member is a cylindrical member having an external surface extending in a periphery of the cylindrical member, the torque member further having a first and a second end face, and wherein the first fluid channel extends between an inlet provided in the first end face of the torque member and an outlet provided in the external surface. 3. A downhole tool according to claim 1, the torque member comprising a second fluid channel extending between a second inlet and a second outlet. 4. A downhole tool according to claim 3, wherein the inlet of the second fluid channel is provided in the external surface of the torque member and the outlet of the second fluid channel is provided in the second end face. 5. A downhole tool according to claim 1, the arm assembly comprising an arm member connected with the torque member, a hydraulic motor, and a rotational part, the hydraulic motor being arranged at an end of the arm member and rotationally connected with the rotational part to rotate the rotational part and thereby drive the downhole tool forward. 6. A downhole tool according to claim 5, the arm member comprising a fluid influx channel fluidly connected with the first fluid channel of the torque member, whereby hydraulic fluid may be supplied from the first fluid channel in the torque member and into the first fluid channel in the arm member. 7. A downhole tool according to claim 6, wherein the arm member comprises a through hole extending from one side of the arm member to another and defining a circumferential wall, wherein a part of the torque member constituting an arm member interface extending in a longitudinal direction of the torque member, and wherein the outlet of the first fluid channel of the torque member is arranged in the arm member interface and an inlet of the fluid influx channel is arranged in the circumferential wall defined by the through hole, the arm member interface being adapted to engage with the through hole, so that the outlet and the inlet are fluidly connected. 8. A downhole tool according to claim 6, the arm member further comprising a fluid reflux channel fluidly connected with the second fluid channel of the torque member. 9. A downhole tool according to claim 7, wherein the through hole has a cross-sectional shape, in a direction transverse to the extension of the through hole, corresponding to a cross-sectional shape of the arm member interface, in a direction transverse to the longitudinal direction of the torque member, the cross-sectional shape of both the though hole and the arm member interface being two-sided, trilateral, triangular, rectangular, multilateral, or oval. 10. A downhole tool according to claim 7, wherein the through hole has a geometry comprising multiple faces and the arm member interface has a geometry comprising multiple faces and the outlet and the inlet of both the through hole and the arm member interface are arranged on separate faces. 11. A downhole tool according to claim 6, the arm assembly further comprising a tube member arranged in a bore in the arm member for fluidly connecting the first fluid channel of the torque member with the fluid influx channel of the arm member, whereby the tube member provides a fluid communication between the first fluid channel and the fluid influx channel. 12. A downhole tool according to claim 2, the tool housing comprising a fluid supply channel and wherein the first fluid channel of the torque member is fluidly connected with the fluid supply channel of the tool housing by the first end face of the torque member extending into the tool housing. 13. A downhole tool according to claim 12, the tool housing comprising a first tool housing part and a second tool housing part, wherein a fluid return channel is provided in the second tool housing part and the fluid supply channel is provided in the first tool housing part, and wherein the second fluid channel of the torque member is fluidly connected with the fluid supply channel by the second end face of the torque member extending into the second tool housing part. 14. A downhole system comprising the downhole tool according to claim 1 and an operational tool connected with the downhole tool for being moved forward in a well or borehole.
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이 특허에 인용된 특허 (1)
Gissler Robert W. ; Holcombe Michael W. ; Purkis Daniel,GBX, Downhole tractor.
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