HIGH-RELIABILITY FLEXIBLE DRILL ROD

WIPO Patent Application WO/2022/206896

A1

A high-reliability flexible drill rod, comprising a plurality of transmission units (1) which are connected end to end. Each transmission unit comprises a drill collar housing (11), a mandrel (12), a bit pressure transmission structure (13) and a torque transmission structure (14), wherein the bit pressure transmission structure and the torque transmission structure are arranged independently from each other to achieve separate transmission of bit pressure and torque of a directional drilling tool. The structure is simple, and the development costs of a multilayer oil field are significantly reduced. A deflection center of the bit pressure transmission structure and a deflection center of the torque transmission structure coincide with each other, and during design, the length of the transmission unit can be shortened to the greatest extent, such that the requirements of short-radius and ultra-short-radius drilling are met, the difficulty of well deviation control in a rotary drilling process is reduced while high-build-rate rotary directional drilling is achieved, and the reliability and the deflecting stability of an apparatus are improved.

XU ZICHEN (CN)
YANG ZHONGHUA (CN)
WAN XIAOYUE (CN)

PCT/CN2022/084419

October 06, 2022

March 31, 2022

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WAN XIAOYUE (CN)

E21B17/02; E21B7/06; E21B17/16

CN215213337U	2021-12-17
CN112392410A	2021-02-23
CN107676040A	2018-02-09
CN110617011A	2019-12-27
CN102606073A	2012-07-25
CN101832105A	2010-09-15
CN103775001A	2014-05-07
US20060254827A1	2006-11-16

HAIHONG JIACHENG INTELLECTUAL PROPERTY & PARTNERS (CN)

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