DRILLING TOOL

• Main Authors: NAKAMURA KAZUYOSHI, HISADA KIMIYA
• Format: Patent
• Language: English
• Published: 16.08.2012
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

PROBLEM TO BE SOLVED: To provide a drilling tool for performing smooth boring at lower costs.SOLUTION: A drilling tool in the present invention comprises a casing top 1 that is connected to the tip of a casing pipe; and a ring bit 3 which is attached to the tip of a casing top 1 coaxially therewith...