Separate stifled device towards sand -washing well

The utility model provides a separate stifled device towards sand -washing well, including an oil pipe, an oil pipe lies in the pit shaft, has first annular space district between an oil pipe and thepit shaft, and first annular space is equipped with first packer in the district, has offered the export of first flush fluid on an oil pipe's the pipe wall, is equipped with interconnect's the 2nd oil pipe, second packer in the oil pipe and washes the head, has second annular space district between the 2nd oil pipe and the oil pipe, second flush fluid export has been seted up to the tip that washes the head, and the second packer is used for sitting in second annular space district to form between setting position downside in second annular space district and the shaft bottom upside sit sealregional so that the flush fluid from flow through in the 2nd oil pipe export of second flush fluid to sit seal the region in, again from sit seal the first flush fluid export of flowing through in the region extremely first a