| 摘要 |
The present invention relates to a downhole tubing cutter tool for submerging into a casing or a drill pipe in a wellbore and separating an upper part of the casing from a lower part of the casing by cutting the casing from within, the tool extending in a longitudinal direction, comprising a tool housing having a first and a second housing part, a cutting arm which is pivotably connected with the first housing part and has a cutting edge in a first end, said arm being movable between a retracted position and a projected position in relation to the tool housing, an arm activation assembly for moving the cutting arm between the retracted position and the projected position, and a rotatable shaft arranged in the second housing part and connected with the first housing part for rotating the cutting arm, wherein the arm activation assembly comprises a piston housing arranged in the first housing part and comprising a piston chamber, a piston member arranged inside the piston chamber and engaged with the cutting arm to move the cutting arm between the retracted position and the projected position, the piston member being movable in the longitudinal direction of the downhole tool and having a first piston face and a second piston face, the piston member being capable of applying a projecting force on the cutting arm by applying hydraulic pressure on the first piston face and moving the piston in a first direction. The invention also relates to downhole system comprising a downhole tubing cutter tool according to the invention, and a driving unit for moving the downhole tubing cutter tool forward in the casing. |
