BOTTOMHOLE HYDROMECHANICAL PACKER Russian patent published in 2004 - IPC

FIELD: oil and gas industry, particularly for building and repairing wells, for isolating productive beds arranged closely one to another and for preventing water inflow during well repairing.

SUBSTANCE: packer comprises body, sealing collar, anchoring unit, packing mechanism and shear bushing with seat for shutoff member. Anchoring unit includes anchor and conical bushings. Packing mechanism has fixers with buttress thread formed on inner surface thereof. Buttress thread of packing mechanism engages buttress thread of outer body surface. Control bushing arranged in body is connected with anchor bushing by pins inserted in longitudinal body cuts. Conical bushing has outer conical surface with cone angle of less than 5^o to provide cooperation thereof with anchoring bushing. Conical bushing also has inner conical surface to provide cooperation thereof with fixers. Arranged on upper body part is check valve having left-handed trapezoidal thread for connection thereof with circulation valve formed as left-handed disconnector. All packer members are made of easy-drillable materials.

EFFECT: increased reliability of bed isolation; possibility to leave packer into well.

3 cl, 1 dwg