Liner hanger

A liner hanger comprising a hanger body, wherein the liner hanger further comprises:

• an outer tube assembly (1) which includes a first outer tube (11) and a second outer tube (12) axially inserted with each other, and the second outer tube (12) is connected with the hanger body;
• an inner tube (2) which is sleeved inside the outer tube assembly (1);
• and
• a torque transfer assembly (3) which is disposed between the outer tube assembly (1) and the inner tube (2), the torque transfer assembly (3) comprising:
• a first torque transmitting mechanism (31) which is fixedly arranged on an outer wall of the inner tube (2);
• a second torque transmitting mechanism (32) which is fixedly disposed on an inner wall of the first outer tube (11), and the second torque transmitting mechanism (32) is axially slidably engaged with the first torque transmitting mechanism (31);
• a transmission nut (33) and a reverse-thread nut (34) which are axially slidably engaged with the first torque transfer mechanism (31), and the outer peripheries of the transmission nut (33) and the reverse-thread nut (34) are threadedly connected to the first outer tube (11) and the second outer tube (12) respectively, wherein the thread-rotating direction between the reverse-thread nut (34) and the second outer tube (12) is opposite to the thread-rotating direction between the transmission nut (33) and the first outer tube (11), and the inner tube is configured to be capable of rotating forward, thereby moving the reverse-thread nut upward to disengage from the second outer tube.