METHOD FOR REPAIR AND ISOLATION WORK IN WELLS Russian patent published in 1996 - IPC

FIELD: well repairs. SUBSTANCE: made in flow string are filling holes. Main and additional packer members are installed in filling string before its lowering. Number of additional packer members should correspond to the number of producing formations. They are installed between producing formations. Then, filling string is run into well and filling string-to-casing annulus is separated. Separation is effected in zone of producing formations and in zone of special holes. Isolation material is injected under pressure. Injection is accomplished concurrently with separation of filling string-to-casing annulus. Duration of separation, at least, equals the duration of injection of isolation material. EFFECT: higher efficiency of repair and isolation work in zone of producing formations distributed over the well bore. 2 dwg