WELDING DEFLECTING DEVICE WITH PRACTICALLY BALANCED PRESSURE ANNULAR COMPACT NODE Russian patent published in 2018 - IPC E21B23/12 E21B7/08 E21B33/12 

FIELD: instrument engineering.

SUBSTANCE: group of inventions refers to a downhole deflection device, a well system and a method for sealing an annular gap. Deflector device comprises a deflector, and an annular compact node, located externally and longitudinally movable on the deflecting device in response to the pressure drop, applied over the entire annular compact node. Downhole system comprises a deflector device located in the casing, the deflecting device comprising a deflector and an annular compact node, which seals the annular gap between the borehole deviation device and the casing, wherein the pressure drop across the entire annular compact node is reduced by moving the annular compact node to the downhole deflector. Method of sealing an annular gap formed between a downhole deflector and a casing, may include positioning the annular compact node on the mandrel, the annular compact node slidingly and hermetically engaged with the outer surface of the mandrel, connecting the mandrel with the deflector, and installing a downhole deflector device comprising an annular compact node, a mandrel and a deflector within the casing.

EFFECT: technical result is to increase the efficiency of the downhole deflector.

20 cl, 4 dwg