Patent ID: 10494901

Abstract:
A ball-dropping sliding sleeve with a removable ball seat, comprising an outer barrel (1), an inner sliding sleeve (6) and a removable ball seat assembly; an inner ring downward facing shoulder (2) is disposed at an upper end of the outer barrel (1), a lower joint (3) is fixedly mounted in a lower end of the outer barrel (1), a sliding groove (4) is formed in the outer barrel (1) between the downward facing shoulder (2) and the lower joint (3), and at least one fracturing lateral hole (5) is distributed on a circumference of the outer barrel (1) at an upper side of the sliding groove (4). The structure of the present invention is reasonable and compact, and its usage is convenient. Through the coiled tubing, a connecting sleeve (10), a ball seat sleeve (7) and a ball seat (15) which are located inside the inner sliding sleeve (6) can be lifted up and taken out, which widens the inner channel of the sliding sleeve, eliminates the restriction of the inner diameter of the ball seat (15), and facilitates the post-processing of the complex situations; the pressure relieving channel formed by the pressure relieving holes in the ball seat (15) and the ball seat circular groove (17) can relieve the pressure and facilitating the lifting.