DEVICE FOR CONTROL OF MUD CIRCULATION IN WELL Russian patent published in 1997 - IPC

FIELD: drilling of oil, gas and geothermal wells, in particular, devices for control of mud circulation in construction of wells under complicated conditions. SUBSTANCE: retainer of position of flushing plugs relative to body is made in form of branch pipe concentrically located relative to body and locked relative to body and installed for conjugation in initial position with flushing plugs and axial motion or rotation motion relative to body with radial motion of flushing plugs that provides for simultaneous opening of all flushing channels. EFFECT: higher efficiency. 2 cl, 3 dwg