Metal-based dissolvable ball seat, setting system and setting method

A metal-based dissolvable ball seat, comprising a mandrel, a tail base, a sliding body, a slip and a sealing ring, wherein

• the tail base is coupled to a lower end of the mandrel so that the mandrel can be disengaged from the tail base under a predefined shearing force, the sliding body is disposed to sleeve the mandrel and located above the tail base;
• the slip is disposed outside the mandrel and between the tail base and the sliding body, and the slip is slidably abutted against the tail base and the sliding body respectively;
• the slip and the sliding body are slidably abutted against each other through a first conical surface structure, and/or the slip and the tail base are slidably abutted against each other through a second conical surface structure;
• the sealing ring is coupled to the slip, and is able to move along an axial direction of the mandrel together with the slip,
• the metal-based dissolvable ball seat is configured so that when the sliding body and the tail base are approaching each other, the slip is opened up and the sealing ring is expanded outward;
• and
• that when the sliding body and the tail base are close to each other to a predefined position, the sliding body and the slip are locked to each other,
• wherein a substrate of the slip, the sliding body and the tail base are all made of dissolvable metal materials, and
• wherein the dissolution rates of the tail base, the sliding body, a substrate of the slip and the sealing ring descend in sequence.