ROBOMOLE Russian patent published in 1995 - IPC

FIELD: forming of slim cased holes. SUBSTANCE: robomole has working member, drilling head, slip forms and supporting members. Drilling head consists of front and rear sections interconnected by controlled deflecting tool. Slip forms is made in form of two concentric cylinders on front section. Front and rear supporting members are installed on rear section. Supporting member is made in form of skids with barrel-shaped outer surface and concave spherical inner surface. Outer surfaces of skids have splines. Secured to inner surface of skids is pin. Made on sphere segment is recess to receive pin. Mounted on each pin of the front supporting member is flexible member. Flexible member is made of material with modulus of elasticity lower than that of material of pin. EFFECT: higher efficiency. 2 cl, 6 dwg