The use of a multiphase specific speed for the analysis and improvement of the designs of blade machines for working on gas-liquid mixtures

To increase the oil recovery factor, the bottom-hole pressure is reduced, which is accompanied by an increase in the free gas and mechanical impurities content at the pump inlet. As a rule, the serial equipment is not providing reliable and efficient operation in such conditions. In oil producing wells with the high free gas content, efficiency of the multiphase modules blade stages could be increased by correct selection of the serial equipment and introduction of the new design solutions. The paper analyzes specifics of the gas-liquid mixture flow in the flow path of the blade multiphase stages pumping the gas-liquid mixtures. Recommendations are provided for improving the flow path taking into account the multiphase specific speed coefficient formula. It is proposed to use the multiphase coefficient along with the cavitation specific speed coefficient in development of the blade pumps operating under the steam cavitation conditions.