DEVICE FOR BOTTOM-HOLE ORIENTATION Russian patent published in 1995 - IPC

FIELD: equipment for directional well drilling. SUBSTANCE: device for bottom-hole orientation has cylindrical hollow body with hole for passage of drilling mud and accommodated in body upper and lower supports with holes for passage of drilling mud; eccentric weight installed between supports for rotation round device longitudinal axis. Eccentric weight has hollow on the side of lower support and valve whose seat is located in lower support; orientation angle reading circle is installed on inner surface of lower support for rotation round device longitudinal axis; shutoff member of valve in form of ball and freely locates in hollow of eccentric weight; lower support has annular recess, and body hole is made at the level of annular recess in lower support. EFFECT: higher efficiency. 3 dwg