Method for representing flow pattern of oil-water two-phase fluid

Abstract

The invention provides a method for representing the flow pattern of an oil-water two-phase fluid. The method comprises the following steps that 1, the specific temperature and pressure conditions ofthe oil-water two-phase fluid are divided to obtain different sub-temperature and pressure conditions; 2, under the same sub-temperature and pressure condition, the flow velocity and specific retention of the oil-water two-phase fluid simultaneously serve as independent variables to measure the flow pattern of the oil-water two-phase fluid so as to obtain the corresponding flow patterns of the oil-water two-phase fluid under different flow velocities and different specific retention conditions; and 3, under the same sub-temperature and pressure condition, a flow velocity-specific retention chart used for representing the flow pattern of the oil-water two-phase fluid is drawn to determine a flow pattern boundary of the oil-water two-phase fluid. Through the method, the oil-water two-phase flow patterns under the different conditions can be intuitively and accurately represented, and the foundation is laid for the study of the two-phase flow rule of the oil-water two-phase fluid so as torelieve the situations of difficult lifting and halt production of oil liquid in a 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