CONTROLLED DRILLING LAYOUT Russian patent published in 2012 - IPC E21B7/08 

FIELD: mining.

SUBSTANCE: controlled drilling layout comprising a bit and a downhole motor has a projection in the form of a blade on the housing, the periphery radius of which is larger than bit radius. The above projection is equipped with cutting-shearing elements on the side facing the bit, which cover the distance between periphery radii of projection and bit in radial direction. In order to improve stability of the layout in the well above the projection with cutting-shearing elements on opposite half of the downhole motor housing the provision is made for one more projection.

EFFECT: invention allows increasing technical and economic parameters at drilling of controlled directional wells and horizontal wells.

6 cl, 13 dwg