Identification and control of downhole vibration based on surface data

Identification and control of vibrations of drill strings are of great importance to eliminate drilling accidents and protect drilling bits from premature failure. Globally, economic losses related to failure and damages induced by drill string vibration are up to 300 million every year. Such losses can be reduced significantly as long as rock-breading conditions can be monitored in real time and hazardous vibration of drill strings can be identified and controlled effectively. In this paper, existing researches and applications related to drilling vibration both at home and abroad were reviewed, and mechanisms for generation of such drill-tool vibrations and their relationship with surface data were discussed. Based in energy density optimization, a package of techniques for identification and control of downhole vibration on the baisis of surface data were developed. Field application results show that the vibration identification and control techniques can accurately detect downhole vibration. Through continuous optimization of drilling parameters, the techniques can help to eliminate downhole bottleneck factors so as to fully explore the potential of improving drilling speed. These techniques may provide new alternatives to enhance drilling speeds and to minimize relevant costs.