Abstract: Oil-gas mixture transport is a crucial technology in crude petroleum and natural gas industry. Rotodynamic multiphase pumps have the advantages of compact structure, wide operation range, and good abrasion resistance. The research on rotodynamic multiphase pumps in China started late and developed slowly. Systematic studies were few and the design theory was immature. The energy performance of a multiphase pump is influenced by inlet gas volume fraction (GVF), rotating speed, and fluid viscosity. This paper summarizes the operation performance of the multiphase pump under different working conditions, describes its typical structure, and expounds the research status of its hydraulic design method and performance optimization. This paper also reviews recent advances in the research of two-phase flow patterns, interphase force, and pressure fluctuation of multiphase pumps. In the end, it suggests some topics for future multiphase pump research.

Key words: multiphase pump, liquid-gas two phase, energy performance, design and optimization, two-phase flow pattern, interphase force