DOWNHOLE CHAMBER Russian patent published in 2009 - IPC E21B23/02 

FIELD: oil-and-gas production.

SUBSTANCE: downhole chamber contains hollow casing connected to end top and bottom nozzles, allowing longitudinal channels for connection of chambers to pipes located in hollow casing guide ways, helical surface for orientation of valve relative to pocket, operating for its location in chamber and allowing cross channels, communicating inner cavity of pocket to space, enveloping chamber, herewith helical surface for orientation of valve is implemented on bottom butt of top nozzle so, that its external surface contacts external surface of mounting hardware of top nozzle to hollow casing in point through which pass plane of longitudinal section of chamber, inner pass of helical surface is implemented co-axial to longitudinal channels of top and bottom switchers, and hollow casing is separated by solid insert, which is implemented with additional channel, located co-axial to longitudinal channels of end nozzles of chamber, and parallel to it channel of less cross-section, in which it is implemented pocket for valve, herewith in walls of channel of less cross-section there are implemented cross channels, axis of cross channels, placed in plane of cross-section of solid insertion, form to each other blunt angle, and solid insertion is implemented with two side hollows, at that one of vertical walls of each side hollow forms one of external walls of channel of less cross-section, and other vertical wall - is parallel to axis of cross channels, to which it is communicated particular side hollow.

EFFECT: reliability enhancement of operation of downhole chamber.

4 cl, 4 dwg