The Research on the Necessity of Oil and Gas Separator in Downhole Electric Pump Unit of SZ Heavy Oil Field

There are problems of low pump efficiency and unstable operations of the artificial lifting in the SZ heavy oil area of Bohai Oilfield. Firstly, the performance of downhole oil and gas separator under different conditions is analyzed, especially for the applicability and necessity of the downhole separator under conditions of low gas-liquid ratio. Secondly, the feasibility of removing separator is demonstrated and compared in low gas-liquid ratio oil wells, and the working condition of separator cancellation are also determined. Good results have been achieved in practical application. The research results will play an important role in the optimization of artificial lifting for similar heavy oilfields.