Device and method of electromagnet control intelligent ball injection for horizontal well multistage fracturing

The invention discloses a device and method of electromagnet control intelligent ball injection for horizontal well multistage fracturing. The device comprises an annular pipeline, a ball injection module, a ball injection detecting device (6) and a fluid collecting device (14). The annular pipeline comprises a fracturing fluid main pipeline, a special-shaped connecting pipe (4), an annular connecting pipe (18) and a straight connecting pipe (17), and the special-shaped connecting pipe (4), the annular connecting pipe (18) and the straight connecting pipe (17) are sequentially communicated to form a U-shaped through pipe. The fracturing fluid main pipeline comprises a fracturing fluid main pipeline large-diameter segment (9) and a fracturing fluid main pipeline small-diameter segment (10), one side of the fracturing fluid main pipeline large-diameter segment (9) is communicated with the special-shaped connecting pipe (4), and the special-shaped connecting pipe (4) is communicated with the fluid collecting device (14). The ball injection module is arranged above the special-shaped connecting pipe (4). The device and method have the advantages that under the condition of not stopping a pump, remote control and ball injection sequence adjustment of multiple times of ball injection in multistage fracturing are achieved, the success rate of ball injection is high, use is convenient, and the device can be repeatedly used.