Wells – Processes – Cleaning or unloading well
Patent
1979-08-10
1981-07-21
Leppink, James A.
Wells
Processes
Cleaning or unloading well
166147, 166187, E21B 3700, E21B 33124
Patent
active
042793068
ABSTRACT:
A well washing tool which may comprise: a tubular mandrel; first and second packer assemblies carried on the mandrel at opposite ends thereof; an outer tubular body surrounding the mandrel between the packer assemblies; an annular chamber between the mandrel and the surrounding tubular body; and a valve assembly carried within the annular chamber. The tubular mandrel is adapted for connecting the tool in a pipe string extending to the surface of the well and the lower end may be adapted for blocking flow of fluids from the pipe string through the mandrel flow passage. Ports are provided in the walls of the mandrel and the tubular body permitting fluid communication between the mandrel flow passage and the exterior of the tool. The valve assembly prevents such fluid communication by blocking one or more of the ports. The packer assemblies are actuated by a predetermined pressure and the valve assembly is responsive to a higher predetermined pressure to unblock the ports permitting fluid communication between the mandrel flow passage and the exterior of the tool through the annular chamber.
REFERENCES:
patent: 1802525 (1931-04-01), Newlin
patent: 1808958 (1931-06-01), Lane et al.
patent: 2633200 (1953-03-01), Humason
patent: 2715444 (1955-08-01), Fewel
patent: 2998721 (1961-09-01), Gawlik
patent: 3059699 (1962-10-01), Brown
patent: 3169580 (1965-02-01), Bateman
patent: 3199598 (1965-08-01), Loomis
Berryhill Bill B.
Leppink James A.
Top Tool Company, Inc.
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