A Method for Characterizing Flow Patterns of Oil-Water Two-Phase Fluids

Abstract

The present invention provides a method for characterizing the flow pattern of oil-water two-phase fluid, which includes the following steps: Step 1, dividing the specific temperature and pressure conditions of oil-water two-phase fluid to obtain different sub-temperature and pressure conditions; 2. Under the same sub-temperature and pressure conditions, the flow pattern of the oil-water two-phase fluid is measured with the flow velocity and water holdup of the oil-water two-phase fluid as independent variables, so as to obtain the flow pattern of the oil-water two-phase fluid at different flow rates and different holdups. The corresponding flow pattern under the condition of water rate; step 3, under the same sub-temperature and pressure conditions, draw the flow velocity-water holdup chart used to characterize the flow pattern of the oil-water two-phase fluid to determine the oil-water two-phase fluid flow pattern boundaries. The above method can intuitively and accurately characterize the oil-water two-phase flow patterns under different conditions, laying a foundation for the study of the two-phase flow law of oil-water two-phase fluids, so as to improve the situation that oil is difficult to lift or shut down in vertical wellbore .

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for characterizing the flow pattern of oil-water two-phase fluid. Background technique [0002] In the process of oil production, the temperature and pressure at different depths of the vertical wellbore are different. When the oil is lifted in the vertical wellbore, the temperature and pressure in the wellbore decrease accordingly, which increases the viscosity of the oil, resulting in The oil will gradually lose its fluidity. In addition, the oil will mix with the water from the formation to form an emulsion-like oil-water two-phase fluid. The viscosity of the mixed fluid will further increase, and the lifting friction will further increase, making it difficult to lift the oil in the wellbore, and even There is a phenomenon of wellbore shutdown. Oil-water two-phase fluids will exhibit different flow patterns due to their different physical properties a...

AI Technical Summary

Problems solved by technology

[0004] In order to solve all or part of the above problems, the present invention provides a method for characterizing the law of oil-water two-phase flow, which can intuitively and accurately characterize the flow patterns of oil-water two-phase under different conditions, so as to provide a basis for the study of the two-phase flow of oil-water two-phase fluid. Flow law lays the groundwork to improve oil lift difficulties or stop production in vertical wellbores

Images