The utility model provides a device in pit of polymer is annotated in concentric layering, it includes nested each other phi 48.26mm nitridation oil pipe, phi 88.9mm nitridation oil pipe and sleeve pipe, and phi 48.26mm nitridation oil pipe, phi 88.9mm nitridation oil pipe and sleeve pipe dispose with one heart, the intraductal bottom of phi 88.9mm nitridation oil pipe is provided with inserts sealed ware, is located the phi 88.9mm nitridation oil pipe from the bottom up who inserts sealed ware upper end and has set gradually Y221 packer, scalping screen pipe and Y111 packer, insert sealed ware for be used for the shutoff be located Y221 packer below first annular space insert sealed ware, first annular space be the space of encirclement between phi 48.26mm nitridation oil pipe and the phi 88.9mm nitridation oil pipe, the Y111 packer is for being used for the shutoff to be located the packer of the second annular space of oil reservoir top, and the second annular space be the space of encirclement between phi 88.9mm nitridation oil pipe and the sleeve pipe.