Casing hanger and annulus sealing device running tool for deepwater drilling, and method for using the same

A casing hanger and annulus sealing device running tool for deepwater drilling, comprising:

• a hollow spindle, wherein an upper part of an outer wall of the spindle is hermetically connected to a hollow suspension structure via a hollow torque transmission structure, one end of the spindle away from the torque transmission structure slidably passes through a piston, and an outer wall of the piston is connected to a lower part of an inner wall of the suspension structure in a sealed manner, and an inner cavity of the suspension structure communicates with an inner cavity of the torque transmission structure to form a piston cavity, one end of the piston away from the torque transmission structure is located outside the piston cavity, the piston cavity and the piston form a hydraulic piston structure;
• a communication valve structure is provided between an inner wall of the torque transmission structure and the outer wall of the spindle, and the communication valve structure communicates the piston cavity and an inner cavity of the spindle;
• the suspension structure comprises a suspension cylinder capable of rotating with the spindle around a central axis, a bottom of an outer wall of the suspension cylinder is provided with an elastic pin capable of rotating to hook to and rotating to release an annulus sealing device, and the elastic pin is capable of expanding and contracting in a radial direction;
• a lower part of an inner wall of the suspension cylinder is fixedly connected with a rotating cylinder in a sealed manner, the rotating cylinder is capable of rotating with the suspension cylinder, and an inner wall of the rotating cylinder is connected to the outer wall of the piston via a thread, the piston and the rotating cylinder form a lead screw nut structure;
• one end of the piston away from the torque transmission structure is sleeved with an open type lock ring, the open type lock ring is capable of opening radically to hook to a casing hanger and contracting radically to release the casing hanger.