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Title:
COMPOSITE SHOCK ABSORBER FOR PDC DRILL BIT
Document Type and Number:
WIPO Patent Application WO/2021/232709
Kind Code:
A1
Abstract:
A composite shock absorber for a PDC drill bit, comprising a drill body (1), an impact body (14), a disc spring group (4), a torsion bar spring (5), and an annular press sleeve (6). A drill bit vibration impact force is transferred between the drill body (1) and the impact body (14) by means of a torque transmission joint. The impact body (14) is provided at the lower end of the drill body (1) and forms a shock absorbing cavity. The drill body (1) is provided with a water inlet (2) and the impact body (14) is provided with a water outlet (13). The torsion bar spring (5) is cylindrical. The upper end of the torsion bar spring (5) is provided with an external thread, and the lower portion thereof is provided with a spline (7). The torsion bar spring (5) is located within the shock absorbing cavity. The upper end of the torsion bar spring (5) is threadedly connected to the drill body (1), and the lower portion thereof extends into the impact body (14) and is connected to the impact body (14) by means of the spline. The disc spring group (4) is sleeved on the outer side of the torsion bar spring (5). The annular press sleeve (6) is provided at the lower end of the disc spring group (4). A bearing group (8) is provided between the lower end face of the annular press sleeve (6) and an annular step of the impact body (14) located in the drill body (1). The composite shock absorber can weaken a damage of the slippage effect to a PDC cutting tooth and absorb axial vibration from a drill string, thus effectively prolonging the service life of a drill bit.

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Inventors:
XU, Jinchao (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
LI, Wei (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
LI, Siqi (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
GAI, Jingming (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
SUN, Wenfeng (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
ZHAO, Huan (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
Application Number:
PCT/CN2020/128906
Publication Date:
November 25, 2021
Filing Date:
November 16, 2020
Export Citation:
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Assignee:
NORTHEAST PETROLEUM UNIVERSITY (High-tech Development ZoneDaqing, Heilongjiang 8, CN)
International Classes:
E21B17/07
Attorney, Agent or Firm:
BEIJING DONGFANG SHENGFAN IP AGENT FIRM GP (Beijing 0, CN)
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