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A plunger suitable for horizontal wells, comprising a plurality of single plunger unit bodies and a fishing head, wherein the single plunger unit body includes a gas guiding device, a direction changing device, and a spiral system. The gas guiding device is a gas guiding groove with a gas guiding groove The plunger cylinder; the direction changing device includes thick stubs, thin stubs, and universal joints; the helical system includes helical blades, fixed rings, and bearings. The bottom and top are connected in sequence, the spiral blades are symmetrically distributed around the fixed ring, the bearing is embedded in the fixed ring, and is sleeved on the thin short section. The influence of structural changes on the sealing performance of the plunger ensures the sealing performance of the plunger when it passes through the curved well section; the helical blade is used to generate strong turbulent flow, thereby effectively ensuring the sealing performance of the plunger during operation;
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