Special setting ball seat for fracture of horizontal well

The utility model relates to a special setting ball seat for the fracture of a horizontal well, which is mainly used for the fracture transformation of the horizontal well in the exploration process of an oil and gas field. The ball seat consists of an upper joint, a connection sleeve, an external cylinder, a ball seat, a pin, a split ring and a lower joint. In the descending process, the top and bottom of the ball seat are communicated by the upper and lower through holes in the connection sleeve; and a pipe column is communicated with an annulus at the moment, so that the grouting and circulation are convenient; during setting operation, a ball is placed at a proper place; and a valve ball plugs the ball seat, so that an oil pipe holds pressure instantly; the pin is cut through; the ball seat is pushed to move downwards by pressure; the split ring is blocked in a circumferential groove on the external wall of the ball seat to realize locking; at the moment, the connection channels of the upper and lower through holes are plugged; and the packer setting of the pipe column can be realized by continuous pressurizing. The ball seat has a simple structure, and is safe and reliable and suitable for the staged fracturing construction of the horizontal well.