EQUIPMENT FOR SELECTIVE TREATMENT OF BEDS Russian patent published in 2019 - IPC E21B33/12 

FIELD: technological processes.

SUBSTANCE: invention relates to equipment for selective treatment of formations. Equipment for selective treatment of formations comprises upper and lower cup packers, cups of which are fixed by divergent parts towards each other, centralizers, central and annular passage channels formed by two concentrically installed pipes – external and internal. Inner pipe is installed in adapter equipped with transverse channels connecting central pass channel of inner pipe with space above upper cup packer, and vertical holes connecting annular passage channel with inner cavity of tubing string. Annular passage channel by means of radial openings is connected to the outer space between the cups. Annular passage channel below radial holes is sealed by means of sealing device installed on lower part of inner pipe. Above the adapter there is a circulating valve with radial channels in the housing, covered with a bushing installed on the valve body by means of shear pins, and with an inner protrusion for installation of the releasable insert. A plug is fixed in the lower part of the bushing using shear elements. A drain valve is installed above the circulation valve.

EFFECT: possibility of bringing working fluid to machined interval on circulation.

1 cl, 4 dwg