Invention Grant
- Patent Title: Method of protecting a top drive drilling assembly and a top drive drilling assembly modified in accordance with this method
- Patent Title (中): 保护根据该方法修改的顶部驱动钻井组件和顶部驱动钻井组件的方法
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Application No.: US12625920Application Date: 2009-11-25
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Publication No.: US08381840B2Publication Date: 2013-02-26
- Inventor: Shawn James Nielsen , Sinisa Dobrijevic
- Applicant: Shawn James Nielsen , Sinisa Dobrijevic
- Agency: Davis & Bujold, PLLC
- Main IPC: E21B3/02
- IPC: E21B3/02 ; E21B19/18
Abstract:
A method of protecting a top drive drilling assembly includes incorporating a shock absorbing sub incorporated in the top drive drilling assembly. The shock absorbing sub comprises a first body and a second body capable of relative axial movement, with a shock absorbing medium disposed between the first body and the second body to absorb any reactive axial force exerted upon the top drive drilling assembly.
Public/Granted literature
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