PACKER ( VARIANTS ) Russian patent published in 2001 - IPC

FIELD: equipment to survey and repair boreholes. SUBSTANCE: invention specifically refers to packers for search and remedy points of loss of leak-tightness of operational string in wells. Proposed packer has shaft and packer units with sealing members, hydraulic cylinder, piston and system of intercommunicated holes. It is fitted with relief valve with case made in the form of turned over sleeve. It houses guiding bushing with ducts in walls and shut-off member. Bottom of case has several through holes and several holes with outlet into side wall. Packer units according to first variant are installed for opposite movement of hydraulic cylinders. In agreement with second variant shaft can carry one packer unit with upward-downward travel of hydraulic cylinder. EFFECT: expanded capabilities and prolonged service life of packer. 3 cl, 3 dwg