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, the arm assembly having an arm member connected with the tool housing in one end, an arm activation assembly
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, the arm assembly having an arm member connected with the tool housing in one end, an arm activation assembly arranged in the tool housing for moving the arm assembly between the retracted position and the projecting position, and a pump for circulating hydraulic fluid. The arm assembly has a hydraulic mechanism arranged in connection with the arm member, and a fluid influx channel provided in the arm member, the fluid influx channel being in fluid communication with the hydraulic mechanism for supplying hydraulic fluid from the pump to the hydraulic mechanism.
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, the arm assembly comprising an arm member connected with the tool housing in one end, the arm assembly
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, the arm assembly comprising an arm member connected with the tool housing in one end, the arm assembly including a rotational part to propel the downhole tool in a well, the rotational part including a wheel ring structured to provide traction against a side wall of a well casing,an arm activation assembly arranged in the tool housing for moving the arm assembly between the retracted position and the projecting position, anda pump for circulating hydraulic fluid, wherein the arm assembly comprises a hydraulic mechanism at least partly arranged in the rotational part, and an internal fluid influx channel provided in the arm member and extending to the wheel ring, the internal fluid influx channel being in fluid communication with the hydraulic mechanism for supplying hydraulic fluid from the pump to the hydraulic mechanism for retracting and projecting the arm assembly, driving said hydraulic mechanism and rotating said rotational part and the wheel ring. 2. A downhole tool according to claim 1, wherein the hydraulic mechanism is a hydraulic motor or a hydraulic cylinder, and the fluid influx channel is fluidly connected with the hydraulic motor or hydraulic cylinder for supplying hydraulic fluid from the pump to the hydraulic mechanism. 3. A downhole tool according to claim 2, wherein the rotational part is connected with the hydraulic motor, whereby the rotational part is rotated by the hydraulic motor to propel the downhole tool in a well. 4. A downhole tool according to claim 3, the arm assembly further comprising a motor housing arranged at one end of the arm member, and the motor housing and the rotational part defining an inner space in which the hydraulic motor is arranged, wherein an outlet of the fluid influx channel and an inlet of the fluid reflux channel are fluidly connected to the inner space. 5. A downhole tool according to claim 4, the motor housing comprising a circumferential housing wall constituted by a protruding part of the arm member, whereby the motor housing is provided as an integrated part of the arm member. 6. A downhole tool according to claim 3, wherein the rotational part forms a sealed closure for a housing of the hydraulic mechanism. 7. A downhole tool according to claim 1, wherein a fluid reflux channel is provided in the arm member, the fluid reflux channel being in fluid communication with the hydraulic mechanism to drain hydraulic fluid from the hydraulic mechanism. 8. A downhole tool according to claim 1, the arm member further comprising a through hole extending from one side of the arm member to another, thereby defining a circumferential wall, and the arm activation assembly further comprising a torque member recieved in the through hole, thereby connecting the arm member with the arm activation assembly. 9. A downhole tool according to claim 8, wherein an inlet of the fluid influx channel and an outlet of the fluid reflux channel are arranged in the circumferential wall encircling the through hole. 10. A downhole tool according to claim 8, wherein the circumferential wall encircling the through hole comprises multiple grooves and protrusions extending from one side of the arm member to another, and wherein the multiple grooves of the circumferential wall are adapted to receive corresponding protrusions provided in the torque member. 11. A downhole tool according to claim 8, the torque member comprising a first fluid channel fluidly connected to the fluid influx channel of the arm member and a second fluid channel fluidly connected to the fluid reflux channel of the arm member. 12. A downhole tool according to claim 8, the arm activation assembly comprising a piston chamber and a piston member movable in the longitudinal direction of the downhole tool and arranged inside the piston chamber, wherein the torque member is rotated by the piston member to move the arm assembly between the retracted position and the projecting position. 13. A downhole tool according to claim 8, the arm assembly further comprising a tube member arranged in a bore provided in the arm member, the bore extending from one side of the arm member to the through hole, wherein a first end of the tube member extends through the bore and into engagement with one of the fluid channels of the torque member recieved in the through hole, whereby the torque member is secured in the through hole of the arm member. 14. A downhole tool according to claim 13, the tube member comprising an inner bore extending between an inlet arranged in the first end of the tube member and an outlet provided in a side wall of the tube member, wherein the tube member fluidly connects the first fluid channel of the torque member and the fluid influx channel of the arm member. 15. 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. 16. A downhole system according to claim 15, wherein the operational tool is a stroker tool, a key tool, a milling tool, a drilling tool, or a logging tool. 17. A downhole tool according to claim 1 further comprising a plurality of arm assemblies and a hydraulic mechanism for each arm assembly.
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이 특허에 인용된 특허 (2)
Post, Roger A.; Sheiretov, Todor K.; Roy, Carl J.; Cordera, Joseph F., Bi-directional grip mechanism for a wide range of bore sizes.
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