民航乘务英语实用会话 第3版
- 作者范建一编著
- 出版社北京：中国民航出版社
- 标注页数246 页
- 文件页数253 页
- 文件大小31.56 MB
- 出版时间2014
- ISBN9787512802063
A Shell Drilling Damper with Elevated FlexibilityA. S. Velichkovich; S. V. Velichkovich · 2002
Elastic spindle for a bottom-hole motorA. S. Velichkovich; S. V. Velichkovich · 2000
System for Protecting Well Rod Pumping Plants from Vibratory, Inertial, and Impact LoadsA. S. Velichkovich; S. V. Velichkovich; V. M. Shopa · 2002
The elastic element in a damper for drilling under anomalous thermal conditionsA. S. Velichkovich; S. V. Velichkovich · 1998
Double-action vibration damper for controlling the drilling string dynamic modeA. S. Velichkovich; S. V. Velichkovich · 1997
Bottom-hole vibration damper with a sheathed variable-rigidity elastic elementA. S. Velichkovich; S. V. Velichkovich · 1994
Improving the reliability, durability, and efficiency of drill-rig shock absorbers with shell-type elastic elementsA. S. Velichkovich; S. V. Velichkovich · 2000
Drill string vibration damper for wells in corrosive mediaS. V. Velichkovich · 1991