Patent ID: 9745809
Date: 2017-08-29
CPC Classifications: E21B

Claim:
1. A liner hanger top packer, comprising a body, wherein the liner hanger top packer further comprises an adjusting sleeve, a retaining apparatus, a base-sealing apparatus, a base-hanging apparatus and a locking mechanism which are sleeved sequentially from top to bottom on the body, wherein, the locking mechanism is arranged between the base-sealing apparatus and the base-hanging apparatus, the locking mechanism comprising: a locking ball sleeve sleeved on the base-sealing apparatus with an upper end abutting against the base-sealing apparatus; a ball socket arranged at a junction of the base-sealing apparatus, the locking ball sleeve and the base-hanging apparatus, and which is formed of a first ball socket arranged in the base-sealing apparatus, a second ball socket arranged in the locking ball sleeve and a third ball socket arranged in the base-hanging apparatus; and a steel ball arranged in the ball socket to restrict the axial relative movement between the base-sealing apparatus, the locking ball sleeve and the base-hanging apparatus, wherein when the base-sealing apparatus moves downward relative to the body, the steel ball falls into a ring slot in an outer surface of the body, thereby removing the restriction to the axial relative movement between the base-sealing apparatus, the locking ball sleeve and the base-hanging apparatus.