METHOD AND SYSTEM FOR IMPROVING DRILLING SPEED BY USING DRILL STRING VIBRATION

摘要

A system for improving a drilling speed by using drill string vibration comprises a downhole drill string vibration-reduction and supercharging device, and an ultra-high pressure bit device used for a downhole supercharger. The downhole drill string vibration-reduction and supercharging device comprises a high-pressure runner (16). The ultra-high pressure bit device used for the downhole supercharger comprises an ultra-high pressure drilling fluid transmission runner. The ultra-high pressure drilling fluid transmission runner comprises an ultra-high pressure drilling fluid runner (25), a high-pressure resisting hose (28) and a high-pressure resisting rigid tube (30). The high-pressure runner (16) is connected to the ultra-high pressure drilling fluid runner (25); an end of the high-pressure resisting hose (28) is connected to the ultra-high pressure drilling fluid runner (25), and the other end of the high-pressure resisting hose (28) is connected to the high-pressure resisting rigid tube (30); and the other end of the high-pressure resisting rigid tube (30) is connected to an ultra-high pressure drilling fluid nozzle (31). Also disclosed is a method for improving a drilling speed by using drill string vibration. The system structure is stable and reliable. Meanwhile, the power source in the method is the bit pressure fluctuation at the shaft bottom during drilling, and the injection pressure of the drilling fluid at the shaft bottom is improved by using energy obtained due to decrease of the bit pressure fluctuation. The adverse effect of the bit pressure fluctuation on the drilling procedure is reduced, which ensures construction safety and improves injection pressure of the drilling fluid at the shaft bottom, thereby improving the drilling speed.