Long spiral three-blade drilling bit suitable for broken pebble stratum

• Main Authors: SHAN BAOXUE, ZHANG XIAOFEI, NI XIAORONG, LIU ZHONGXUE, SONG QIANKUN, LYU LINDONG, YAN ZHIYING, ZHAO WENQIANG, WEI WENHUI, XIE XIANG, LIU CHAOHUI, WU HUIMIN
• Format: Patent
• Language: Chinese; English
• Published: 11.01.2022
• 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

A long spiral three-blade drilling bit suitable for a broken pebble stratum relates to the field of building construction, and comprises a drill body steel cylinder, drill bit sheets uniformly welded at the lower part of the drill body steel cylinder at intervals along the annular direction, alloy teeth uniformly welded at the bottom edges of the drill bit sheets at intervals, and lower-layer cutting knives uniformly welded at the middle part of the drill body steel cylinder along the annular direction at intervals, and the upper-layer cutting knives are uniformly welded on the upper part of the drill body steel cylinder at intervals along the circumferential direction. The lower-layer cutting knife is an upward trapezoidal plate-shaped cutting knife and is welded on the outer side surface of the drill body steel cylinder, and the trapezoidal bevel edge of the lower-layer cutting knife is connected with the drill body steel cylinder in a full welding manner; the included angle between the plane where the dril