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Abstract

A continuous flow well bore perforation washing tool is shown of the type having a tubular mandrel with sidewalls defining a flow passage, an upper end for connection in a pipe string and a lower end with means for blocking the flow of fluid from the pipe string through the mandrel. Upper and lower pressure responsive packer assemblies are carried on opposite ends of the mandrel. An outer setting sleeve surrounds the mandrel between the packer assemblies to define an annular chamber between the mandrel and setting sleeve. A continuous flow passage communicates the mandrel interior, the annular chamber, and the well bore. Selectively sized orifices in the setting sleeve form a restriction in a portion of the continuous flow passage. By selectively sizing the orifices, a back pressure buildup can be created in the annular chamber which is used to set the packer assemblies as fluid is continuously flowed through the continuous flow passage.

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First Claim