WELL MAGNETIC FISHING TOOL

摘要

FIELD: well drilling. SUBSTANCE: well magnetic fishing tool has circular cylindrical case with adaptor and mill crown, magnetic system installed in the case and washing passages placed on peripheral magnetic circuit. Magnetic system has peripheral magnetic circuit and coaxial central magnetic circuit made of magnetically soft material, and permanent magnets placed between. Central magnetic circuit is made in the form of a cone or pyramid the bases of which faces lower butt of the fishing tool. The fishing tool is additionally provided with protective non-magnetic plates placed from top and bottom of the magnetic circuit. EFFECT: high efficiency.