Experiment on lateral vibration characteristics of horizontal rotary drilling string

Key words:  drilling  horizontal rotary drilling string  weight on bit  rotary speed  lateral vibration  experiment

Abstract:

By using horizontal well drilling string simulation experiment device, experiments on lateral vibration characteristics of horizontal rotary drilling string were curried out under different weight on bit and rotary speed. The results show that the weight on bit and rotary speed are the main factors affecting the lateral vibration characteristics of the horizontal rotary drilling string. With the increase of the rotary speed, the two lateral vibration frequencies become large, and the phase difference between the two lateral vibrations becomes small. The relationship between two lateral vibration frequency and the drilling string rotation frequency is linear. The increase of weight on bit has little influence on the two lateral vibration frequencies, but the phase difference of the two lateral vibrations becomes small. In actual drilling, the drilling string is always in the low right part of the wellbore and the rotary speed 52.1r/min should be avoided.