Numerical Calculation of Internal Flow Field of the New Type Rigid Blade Motor of the Down-hole Dynamic Drilling Tool

Along with the development of ocean oil and gas exploration to the deep-water, the down-hole temperature is more and more higher with the drilling depth increasing. The down-hole hydraulic dynamic drilling tool does not adapt to the needs of the offshore deep-water drilling. Therefore, development of high resistant temperature, excellent oriented performance down-hole motor is imminent. The author designed a new type rigid blade down-hole power drilling tool, its slipping blade belongs to the rigid blade, which has the advantages of large output torque and high reliability compared with the domestic and foreign down-hole dynamic drilling tool. This paper mainly carried on the numerical simulation calculation to the 178mm down-hole motor. The calculation model was established based on characteristics of the new type blade dynamic drilling tool. The fluent software was used to calculate different pressure and velocity distribution at the different flow rate and different speed of rotator. The calculation results show that when the drilling fluid flow rate from 30 to 35L/s and the rotator speed is 180rpm, the dynamic drilling tool can achieve the best efficiency, and the abrasion of the motor blade and other parts is minimum. The results can provide the basis for the optimization of the structure parameters and working parameters of the new type down-hole dynamic drilling tool.