HYDROMECHANICAL PACKER Russian patent published in 2004 - IPC

FIELD: mining industry, particularly for closing axial channel of casing pipes under perforation space for isolation of bottom liquid against water.

SUBSTANCE: packer comprises shaft connected with pipe string through adapter. Arranged on adapter is case of hydraulic cylinder located from outside and forming annular chamber in which piston with releasing cone is installed. Case of hydraulic cylinder has metal sealing shell. Packer shaft comprises split collet with heads extending into metal sealing shell and surrounding releasing cone. Teeth of anchor member are disposed on outer side of split collet below metal sealing shell. Installed in axial channel is stepped spring-loaded bushing having seat and ball valve. Check valve is located in axial channel of stepped spring-loaded bushing. Radial orifices are formed in shaft body below seat. Stepped spring-loaded bushing is connected to shaft by means of thoriated shear member. Packer installation is carried out by placing ball valve on seat and applying overpressure to piston along with introducing releasing cone between split collet heads and deforming thereof and metal sealing shell up to contacting with casing pipe wall. Teeth of anchor means are depressed in pipe body, which results in packer fixing.

EFFECT: increased duration of well bore bridging, possibility of isolation mix feeding into under-packer area, blocking hydrodynamical communication with under-packer area after pressure relief.

3 dwg