Abstract
As a new type of oil production machinery, the metal progressing cavity pump has good adaptability for the working conditions of heavy oil thermal recovery. Because the stator and rotor of the metal progressing cavity pump are made of metal, the clearance fit is adopted. This paper analyzes the working principle of the metal progressing cavity pump, studies the clearance of the stator and rotor of the metal progressing cavity pump. Based on the Reynolds equation, the mathematical model of the clearance flow is established. The equivalent model of the axial clearance is established, the friction force and the flow are studied in depth, and the basis for analyzing the leakage and fatigue wear of the metal progressing cavity pump is provided.
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