This right-hand set PT packeris one kind of Packer which has slip structure, high load and compressible setting method. It could keep the high differential pressure from one side of casing. ThisPacker has larger by pass area below elements, which could reduce suction in running tools and balance two sides of pressure before setting. The by pass is closed by sealing valve. Well testing apply large by pass structure firstly, then apply hydraulic hold-down slip top coupling structure.