Mechanism Modeling for Multiphase Flow Entering Pump Process

doi:10.3901/JME.2020.12.214

Abstract

Abstract: From the perspective of change of the mass ratio of oil-gas-water multiphase flow in the lifting process, the change law of dissolved gas-oil mass ratio with the pressure is determined. The compressibility of the gas in the pump barrel, dissolved gas separation, local resistance of the pump valve and vibration of the sucker rod string are comprehensively considered. The new mathematical model for oil-gas-water multiphase flow entering pump process is set up, which is the mathematical model describing interrelationship of the pressure in the pump barrel, the fluid flow into the pump barrel, the volume of the fluid in the pump barrel and the movement of the plunger piston. The field application showed that the relative error between the simulation value of pump efficiency and the real value is less than 10%, the geometric characteristics of simulated surface and pump dynamometer card conformed to the production activity, and the model precision met the engineering requirement. The new model is suitable to the pump efficiency calculation, the optimal design and the fault diagnosis of the sucker rod pumping system.

Key words: oil well, pump efficiency, volumetric efficiency, multiphase flow, dynamometer card, mechanism modeling

CLC Number:

N945

LI Xiangyu, GAO Xianwen, YUAN Chunhua, HOU Yanbin. Mechanism Modeling for Multiphase Flow Entering Pump Process[J]. Journal of Mechanical Engineering, 2020, 56(12): 214-221.

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