WELL DEVIATION DEVICE Russian patent published in 2012 - IPC E21B7/08 

FIELD: mining.

SUBSTANCE: well deviation device includes rock-destructing tool, downhole motor with a shaft and housing, and deflection element installed on lower end of downhole motor housing. At that, deflection element is made in the form of upper and lower sleeves adjacent to a gap by means of their lower and upper splined inclined end surfaces with possibility of adjusting the deflection angle by means of restrictors installed into the gap. Upper sleeve is equipped with an arrester and replaceable breaking out supports of variable height, which are located on opposite side from the restrictor for prevention of the layout from the action of rotary moment of the bit. Inside the deflection element there installed is shaft of splined hinge assembly, which has hemispherical end surface and is connected to the motor shaft by means of housing of splined hinged assembly and splined assembly with possibility of its back movement in axial direction, and to rock destructing tool by means of a half-hinge and an adapter. And restrictors installed into a gap can be made in the form of support washers.

EFFECT: increased smooth and adjustable drift angle in the design range, high and stable intensity of i curvature, accurate construction of shaft according to the optimum calculated well profile, drift angle at the specified interval of the shaft at maintaining the layout straightness at its lowering and lifting.