DEVICE FOR SECONDARY OPENING AND CREATING DEPRESSION UPON A LAYER Russian patent published in 2004 - IPC

FIELD: oil extracting industry. SUBSTANCE: device has body, depression and slag-accumulating chambers with reciprocal valve, compacting and shear elements, means for lowering and raising and perforated shank. Body is made with a shelf on upper part and with two rows of radial channels which are overlapped by upper spring-loaded bushing in default position, and is also equipped with a nipple. Radial channels are separated by solid transversal wall. Nipple is made with upper and lower ring- shaped stops, between which through apertures are made with fixing balls mounted in them. Nipple is connected to perforated shank and is also telescopically connected to the body. In default position fixing balls are engaged with lower bushing on the outer side. Lower bushing is connected to the nipple by a shear element, and spherical grooves are made on outer surface of body. Upper and lower bushings are made with cylindrical groove on inner surface and are mounted with possible longitudinal displacement. Lower ring-shaped stop of nipple is equipped with packing elements, and its outer diameter is selected to fit inner diameter of mounting bushing. Perforated shank is equipped with solid stop with a shelf and fixing ring on outer surface. Mounting bushing is connected to body of supporting assembly by a shear element, said body being a part of casing string. Outer diameter of solid stop is selected to fit inner diameter of condensing funnel. As depression and slag-accumulating chambers means for lowering and raising of device is used. Condensing funnel is mounted in cylindrical bore of mounting bushing of supporting assembly and is connected to it by shear element for engaging solid plugs mounted in casing string oppositely to productive layer. EFFECT: increased functional capabilities. 1 dwg