INSERT FOR CUTTING FACILITY Russian patent published in 1998 - IPC

FIELD: bore-hole drilling machinery and equipment. SUBSTANCE: this is intended for drilling deep bore-holes, primarily for oil and gas recovery. Cutting facility incorporates turbo-drill. Body of turbine section of turbo-drill is connected through adapter to lower pipe of drilling string. Attached to shaft of trubo-drill spindle by threading is diamond drilling bit. Body of turbo-drill turbine section and body of turbo-drill spindle are centered in bore-hole being drilled by means of centralizers. Lower nipple-type reamer-stabilizer is provided with external rock-crushing surface. Tangential line to longitudinal cross-section of rock-crushing surface is at any point located at angle of at least 45 deg. to turbo-drill axis. Outer diameter of diamond drilling bit is equal to or by 2-5 mm larger than diameter of rock-crushing surface of lower nipple-type reamer-stabilizer. Shaft of turbo-drill spindle is eccentrically displaced relative to axis of turbine section shaft. EFFECT: higher efficiency. 2 dwg