PACKERING HYDROMECHANICAL DEVICE Russian patent published in 2002 - IPC

FIELD: drilling and major repairs of oil and gas wells. SUBSTANCE: packering hydromechanical device consists of upper and lower sealing units interconnected by pipes and valve unit between them. Upper sealing unit is made in the form of stem with sealing collars located between supports. Lower support is made in the form of cylinder connected by means of pipe with valve unit. Cylinder accommodates piston secured to stem of upper sealing unit. Hydraulic anchor is installed under lower sealing unit. Claimed device is designed for interval treatment of producing formations by method of selective injection of isolating materials and reagents to preset intervals of formation, and also for directional injection of isolating materials to borehole zone through process holes in casing string in elimination of casing string-borehole annulus overflows. Technical result of invention consists in reduction of labor input and increased efficiency of free removal of spacer fluid from interval of repair, shutoff by sealing units of a part of casing string in selective injection under pressure of preset volume of isolating materials into formation and casing string-borehole annulus and subsequent washing out of their excess. EFFECT: higher efficiency. 3 dwg