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Analysis on rotary valve hydraulic torque of drilling fluid continuous wave signal generator
JIA Peng1, FANG Jun1, SU Yi nao2, LI Lin2
(1.College of Mechanical and Electronic Engineering in China University of Petroleum, Dongying 257061, China;2.Drilling Research Institute, CNPC, Beijing 100097, China)
Abstract:
The backflow occurred behind the rotor blades when the rotor rotated and the inlet velocity angle of the rotor varied with rotor 's motion,which lead to the great change of the hydraulic torque on the rotary valve, and the dynamic performance of the rotary valve was influenced. A theoretical calculation model of the hydraulic torque on the rotary valve was established based on the theorem of momentum moment, and then the three dimensional flow field inside the experimental prototype was simulated by CFD method, and the simulation analysis of several influence factors of the hydraulic torque on the rotary valve was made. The results show that the hydraulic torque on the rotary valve tends to open the rotary valve in the starting stage of the closure, and tends to close the rotary valve in other stages. The hydraulic torque can be changed mildly using the curved orifice, and the hydraulic torque can be decreased and the control performance of the motor can be improved by increasing the gap between the stator and rotor or increasing the number of the valve lobe or decreasing the thickness of the valve lobe.
Key words:  measurement while drilling  drilling fluid continuous wave  jet angle  hydraulic torque  CFD method