Abstract:

The linear motor combined with the oil pump is deployed in downhole for lifting.This new method can increase the system efficiency and save energy greatly compared with beam pumping technology.Numerical stimulation for the flow field is carried out according to the structure of linear motor pump system.The dynamic mesh technology and UDF mode of the Fluent is introduced to simulate the motion of valve and piston.The distributions of velocity are obtained at different work times.The evolution progress，flow field configuration and hydrodynamic characteristics of the complex unsteady flow can be reflected in the barrel during the piston motion.As a result，the study with the method of the computational fluid dynamics and the technology of dynamic mesh during researching new oil pump can be regarded as reference and evidence.

Key words: linear motor pump, piston motion, valve motion, dynamic mesh method, flow field