BALL SEAT ASSEMBLY AND BALL THROWING SLIDING SLEEVE TYPE FRACTURING DEVICE

摘要

A ball seat assembly and a ball throwing sliding sleeve type fracturing device. The ball throwing sliding sleeve type fracturing device comprises an inner sleeve (1), an outer sleeve (2), a fracturing ball (5) and a ball seat assembly (6). The inner sleeve (1) is slidably sleeved in the outer sleeve (2), the inner sleeve and the outer sleeve are respectively provided with a fracturing window, and the inner sleeve slides to open or close the fracturing window; the inner surface of the outer sleeve (2) is provided with a fracturing ball release groove (231), and the fracturing ball (5) is thrown to the ball seat assembly (6); when the ball seat assembly moves to the fracturing ball release groove, the fracturing ball generates a downward pushing force under the action of an external force and pushes multiple ball seat supports (61) to move outward in the radial direction, so that the fracturing ball passes through the ball seat assembly and drops to a next segment of the ball throwing sliding sleeve type fracturing device. The device achieves the purpose of fracturing an unlimited number of layers and segments by throwing only one ball, and can reduce construction costs, improve per-well production, and overcome the defect of level difference limitation of a cracking sliding sleeve used in the prior art and the defect that the sliding of the inner sleeve is affected after a shear pin is cut off.