DRILLABLE PACKER Russian patent published in 2007 - IPC E21B33/12 

FIELD: oil and gas industry, particularly to plug hole annuity and to isolate productive reservoirs.

SUBSTANCE: packer comprises hollow cylindrical shaft with sealing member and extrusion washers, as well as upper and lower supports with conical surfaces installed on the shaft. Packer also has fixer, upper and lower slips made as annular sectors. Outer slip surfaces are provided with teeth. Fixer is made as body with boring adapted to receive a set of split spring washers pressed with nut. The nut is installed to cooperate with upper support. Split spring washers may contact with annular grooves made in outer surface of hollow cylindrical shaft. Annular sectors of upper and lower slips are connected with each other by means of connection rings and have annular grooves made in outer sides thereof. Longitudinal slots are made in inner slip surfaces to provide reliable serial breakage of connection rings because of decreased area of slip contact with conical surfaces of upper and lower supports.

EFFECT: increased reliability of hole annuity plugging and increased load-bearing ability of the packer.

2 dwg