Research And Application Of Ground Power Rotary Drilling Downhole Drill String Conditions Analysis And Hydraulic Pressure Shock Absorber

On the basis of analyzing the working circumstance and prosperity of downhole drilling string of the surface dynamic rotating drilling vertical well, the force prosperity and failure forms of downhole drilling string are focused on. And further research has been done on the vibration damage of downhole drilling string as well as the construction and work prosperity of vibrating-proof hydraulic shocker absorber.Several conclusions, curves and formulas in this pager not only have some academic value, but also have some guidance on field engineering construction.In chapter one, engineering flow and current research results in domestic and international of the surface dynamic rotating drilling have been generalized. Furthermore, the engineering value and significance of motion of the surface dynamic rotating drilling downhole drilling string have been illustrated.In chapter two, the prosperity of the motion, force and screwed joint of the surface dynamic rotating drilling downhole drilling string has been discussed.Chapter three discusses the vibration forms of the surface dynamic rotating drilling downhole drilling string,analyzes the damage of low frequency ancf fongif ucfi'na/ vibration to downhole drilling string, and set up a set of math models of the longitudinal and torsional vibration.Chapter four investigates some typical examples of the damage of drilling string in DaQing oil field recent years. And on the basis of the analysis of the prosperity and form of the damage of drilling string, the main factors of the damage of downhole drilling string and the preventive measures have been presented.In chapter five, the vibration of downhole near-bit drilling string was described and the design as well as the in-situ situation of hydraulic shock absorber was introduced.