Title:
HIGH-STABILITY SHORT-RADIUS SLANT DRILLING TOOL
Document Type and Number:
WIPO Patent Application WO/2022/048666
Kind Code:
A1
Abstract:
A high-stability short-radius slant drilling tool, comprising a drill bit (100), a guiding nipple (200) and a self-reset flexible drill pipe (300). The self-reset flexible drill pipe (300) comprises multiple mutually hinged transmission nipples (310, 320) such that the drill pipe (300) is bent easily and flexibly while weight-on-bit and torque are transmitted. The transmission nipples (310, 320) provide, by means of a straightening structure (330), a restoring force to a hinge structure (340) located at a hinging point thereof so as to remain coaxial and guide the guiding tool of the guiding nipple (200) under an extremely low guiding force. The straightening mechanism (330) is arranged in the axial direction of the transmission nipples (310, 320), and at least one end of the straightening mechanism (330) slides in the axial direction of the transmission nipples (310, 320), such that the straightening mechanism (330) is not tensioned or pressed when the drill pipe (300) is bent, and the design difficulty of the straightened mechanism (300) is reduced.
Inventors:
XU ZICHEN (CN)
WAN XIAOYUE (CN)
YANG ZHONGHUA (CN)
WAN XIAOYUE (CN)
YANG ZHONGHUA (CN)
Application Number:
PCT/CN2021/116719
Publication Date:
March 10, 2022
Filing Date:
September 06, 2021
Export Citation:
Assignee:
WAN XIAOYUE (CN)
International Classes:
E21B7/08; E21B17/20
Foreign References:
| CN212508131U | 2021-02-09 | |||
| CN214118082U | 2021-09-03 | |||
| CN207161002U | 2018-03-30 | |||
| US20030024742A1 | 2003-02-06 | |||
| CN109882083A | 2019-06-14 |
Attorney, Agent or Firm:
HAIHONG JIACHENG INTELLECTUAL PROPERTY & PARTNERS (CN)
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