WELL CHAMBER FOR REMOVABLE VALVES Russian patent published in 2007 - IPC E21B23/03 E21B34/06 

FIELD: downhole equipment, particularly for fluid production and working agent injection in well penetrating one or several reservoirs.

SUBSTANCE: well chamber comprises jacket, lower mouth with lower pipe thread, upper mouth with upper pipe thread and inner mandrel adapted to rotate and guide rope tool, namely cantilever reamer. Well chamber also has depression with inner borings, seating surfaces and with one or several pass channels. Lower and upper mouths are connected with lower and upper jacket ends correspondingly. Depression is eccentrically fixedly arranged in inner surface of the jacket to establish hydraulic communication of depression interior with space outside the jacket through one or several pass channels. Jacket is formed of cylindrical pipe. Pipe ends are provided with outer or inner or outer and inner connection threads. The mouths have mating connection threads to connect the mouths to jacket by means of threads or by means of threads and welds. Upper mouth has inner thrust collar and one or several inner slots or projections. Inner mandrel of upper mouth has thrust collar and one or several mating outer projections or slots to support the mandrel and to prevent mandrel rotation inside the mouth. One or several pass channels of the depression, which are located outside cylindrical pipe extend in longitudinal, transversal directions or at an angle thereto. Protective case is installed over the pass channels to change medium flow direction at depression outlet. Guiding member for removable valve receiving is provided over the jacket depression. The guiding member is made as semi-spherical body or composed of two longitudinal plates fixedly connected to inner surface of cylindrical pipe. Cylindrical pipe used as the jacket may be formed as tubing string or drill pipes. The mouths may have end guiding grooves. Outer surface of the depression may have inner guiding end, which is opened or closed.

EFFECT: simplified structure, manufacturing technology and increased operational reliability.

5 cl, 18 dwg