Horizontal well two-stage relay type plunger lifting device and method and movable ball core plunger

The invention provides a horizontal well two-stage relay type plunger lifting device, a horizontal well two-stage relay type plunger lifting method and a movable ball core plunger. The horizontal well two-stage relay type plunger lifting device sequentially comprises a first pressure control type check valve, a first plunger buffer, a movable ball core plunger, a second plunger buffer, a second pressure control type check valve, a third pressure control type check valve, a third plunger buffer, a common plunger and a common plunger lifting wellhead device from bottom to top. According to the two-stage relay type plunger lifting production method for the horizontal well, one-time well closing and one-time well opening can serve as a production cycle. Pressure changes of all parts in a well can be achieved through stratum natural energy or other energy, reciprocating motion of the movable ball core plunger at the two ends of a horizontal section oil pipe is achieved, then accumulated liquid near a horizontal se