Well washing tool and method

USRE31842E · kind E · reissue

Assignee

• Top Tool Company, Inc. · US

Inventor

• Robert Weitz · Cologne, DE

Key dates

• Filing date: Sep 3, 1982
• Grant date: Mar 5, 1985
• Expiry date: Sep 3, 2002

Classification

• Technology area (CPC —): General

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.