In the process of downhole oil-water separation, the traditional liquid-liquid separation hydrocyclone (LLSH) is
used in conjunction with screw pumps, which makes the hydrocyclone rotating around its own axis. The rotation of wall
of hydrocyclone affects its internal flow characteristics and separation properties directly. The orthogonal experiment of
the downhole oil-water separation hydrocyclone (DOWSH) is designed to analyze the effect of flowrate, rotating speed
and split ratio on separation efficiency and pressure drop, The primary and secondary factors of operation parameters have
been studied, and the optimum condition and reasonable working range of DOWSH have been obtained. It provides reliable
basis for process of practical application of DOWSHso as to guide the production.