BOREHOLE WALL PROTECTION ASSEMBLY, DEVICE, AND METHOD

WIPO Patent Application WO/2021/102829

A1

A borehole wall protection assembly (100), a borehole wall protection device (200) comprising the same, and a borehole wall protection method. The borehole wall protection assembly (100) is used together with a drilling tool (60). The borehole wall protection assembly (100) comprises N wall protection sleeves (10) and N-1 position-limiting members (20), N being a natural number greater than 1. An inner diameter of an (N-1)-th wall protection sleeve (10) is equal to or greater than an outer diameter of an N-th wall protection sleeve (10). An (N-1)-th wall protection sleeve (10) comprises a first end (101) and a second end (102) opposite each other. When the (N-1)-th wall protection sleeve (10) is sleeved on the N-th wall protection sleeve (10), an (N-1)-th position-limiting member (20) is used to restrict movement of an N-th wall protection sleeve (10) in a direction from the first end (101) to the second end (102). The borehole wall protection assembly (100) maintains the stability of a borehole wall during hole boring, and prevents a borehole from adverse changes such as shrinking, breaking, chipping, and collapsing, thereby ensuring smooth hole boring.

JP3452084	[Title of Invention] Drilling device
JP2000104475	UNDERGROUND BORING MACHINE

XIE HEPING (CN)
GAO MINGZHONG (CN)
ZHANG GUOQING (CN)
CHEN LING (CN)
ZHU JIANBO (CN)
LI CUNBAO (CN)

PCT/CN2019/121686

June 03, 2021

November 28, 2019

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UNIV SHENZHEN (CN)
UNIV SICHUAN (CN)

E21B7/20; E21B12/00; E21B23/00

WO2005124091A1

2005-12-29

CN110485969A	2019-11-22
CN103906889A	2014-07-02
CN107191143A	2017-09-22
CN109057795A	2018-12-21
CN205823215U	2016-12-21
CN105804654A	2016-07-27

SCIHEAD IP LAW FIRM (CN)

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