REMOVABLE WEDGE DEFLECTOR Russian patent published in 2011 - IPC E21B7/08 

FIELD: oil and gas production.

SUBSTANCE: device consists of guiding wedge with high pressure hose installed in it, of support unit in lower part of guiding wedge and of hydraulic chamber. The support unit consists of inclined surfaces convergent to axis of the deflector downward in form of a prism. A hollow bush with windows movable and spring-loaded from top envelops inclined surfaces. Dies are mounted on axles in the windows. A hydraulic cylinder made with a piston chamber axially actuates the bush from beneath, thus facilitating interaction of dies with inclined surfaces. A piston cavity of the cylinder is communicated with the central channel. Diametres of axial orifices of the dies exceed diametres of axles at value as high, as maximum possible radial travel of the dies. Also, the dies are of different diametres; at installation they facilitate an upper part of the wedge, with its side opposite to working surface, interacting with the wall of the well.

EFFECT: reliability of deflector arrangement when dies are wedged and simultaneously upper end of deflector is pressed to wall of well.

8 dwg