PACKER Russian patent published in 2003 - IPC

FIELD: equipment and technology for well remedial jobs. SUBSTANCE: packer consists of hollow body, packering member (collar) and stops. Located inside body above packering member is lever-operated piston with shear bushing and locking ball. Piston levers are hinged with racks. Made in wall of hollow body or inside it, in the form of tube, are longitudinal bypass channels with inlet and outlet, respectively, above and below packering member. Bypass channels have valves on inlet or outlet, or on both inlet and outlet of fluid flow. EFFECT: provision of invert (reverse) fluid flow in well for treatment of bottom-hole zone with reverse mud circulation. 2 dwg