PACKER PLUG Russian patent published in 2006 - IPC E21B33/12 

FIELD: oil industry, particularly to perform repair works in oil wells.

SUBSTANCE: packer plug to be lowered in well by flow string or drill string comprises spring-loaded triggering device and predeformed spring fixed to triggering device body with lock. The triggering device cooperates with sliding packer dies. Packer comprises sealing member and sliding dies. Packer is arranged on triggering device body and connected with it by shear connection pins and stuffing box seal. Lower end of triggering device body is arranged over the packer, has circulation orifice and cap connected to it by springing ring. Distance between packer and above orifice exceeds projection length of pipe string to which packer plug is fastened for packer plug lowering in well. The projection length is defined by shear stress of connection pins. Bush is arranged inside triggering device body. Upper bush end is adapted to close lock of predeformed spring, lower end thereof is provided with ring seal, seat for free fall shutoff ball and circulation orifice aligned with circulation orifice of triggering device body in working position.

EFFECT: unloading of production string during cement solution forcing into reservoir for high-pressure cement plug creation.

3 dwg