Tool for washing perforations in cased well bore

摘要: Disclosed is a tool for injecting into or washing perforations in cased well bore. The includes an outer housing and inner mandrel with fluid passage therebetween. Perforations are cleaned by discharging from the region between closely spaced cups maintaining pressure. Also disclosed valve system whereby of can be performed either pumping down casing tubing string. discharged enters circulated behind until reentering bore through other above below cups. returned to surface entering bottom ports which communication mandrel.