Perforation circulating washer

摘要: Disclosed is an improved tool for washing the perforations in oil or gas well bore casing. The includes a tubular mandrel having orifices, between pairs of pressure sealing packer cups, discharging cleaning fluid into area and longitudinal spacing cups variable by means length spacer sleeves placed cups. axial internal by-pass tube passing debris through mandrel. telescoping section accommodating elongation contraction due to temperature changes. also permits entering casing eliminating vacuum build-up