Multi-bend casing directional drilling device with controllable build-up rate

• Main Authors: JIANG YAFENG, HAN ZELONG, CHOI SUK YOUNG, CHEN GENLONG, REN QIWEI, ZHAO MING, NIU QINGLEI, CHEN XIAOJUN, SONG GANG, ZHANG XIN, TIAN YINGYING
• Format: Patent
• Language: Chinese; English
• Published: 27.02.2024
• 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

The invention discloses a multi-bend casing directional drilling device with a controllable build-up rate, and relates to the technical field of drilling equipment.The outer drilling tool assembly comprises a locker outer sleeve, a straight casing, a multi-bend casing and an outer drill bit which are sequentially connected in the drilling direction, and a plurality of bending points are arranged on the multi-bend casing; the inner drilling tool assembly comprises a locker inner core, a non-magnetic drill collar, a screw motor, a universal joint and an inner drill bit which are sequentially connected in the drilling direction, the locker inner core is fixedly connected with the locker outer sleeve, the inner drill bit is in transmission connection with the outer drill bit, and the universal joint is arranged corresponding to the multi-bend casing; the outer drilling tool combination is used as a screw motor bent shell, so that a screw motor in the inner drilling tool combination does not need to extend out of