PACKER Russian patent published in 2003 - IPC

FIELD: technology of well drilling, equipment and repairs. SUBSTANCE: packer has body with stops, cylindrical centralizers and sealing members. Each sealing member is made of, at least, two concentrically arranged with clearance flexible cylindrical shells. They are provided at their ends with additional U- shaped collar with circular cavity accommodating ends of said flexible cylindrical shell so that U-shaped collars form rectangular shape of cross- section of sealing member wall. Separating rings are secured to collar bases of both shells. Centering rings are made with circular projections sunk between shells. Made on opposite sides of said circular projections are circular grooves engageable by means of cylindrical centralizers with body stops. Transmitting link from flexible material is located in gap between shells. Surface layer of external and internal sides of sealing member has modulus of elasticity higher than that of core of flexible cylindrical shell. EFFECT: extended functional potentialities of packer and increased well sealing pressure with reduced process power intensity. 7 cl, 6 dwg