Method for determining viscosity characteristics of oil-water emulsification system by considering phase separation behavior

Abstract

The invention relates to a method for determining viscosity characteristics of an oil-water emulsification system by considering phase separation behaviors. The method comprises the following steps: 1, identifying phase inversion characteristics of the oil-water emulsification system; 2, establishing a relationship between the water content of the original homogeneous-state oil-water emulsification system and the dispersion phase and continuous phase holdup; 3, describing phase separation characteristic parameters of the oil-water emulsification system and constructing a mutual relation of thephase separation characteristic parameters; 4, oil-water emulsification system viscosity expression considering a phase separation behavior; and 5, determining the holdup and physical properties of each phase of the oil-water emulsification system under a phase separation state under a certain temperature mixed transportation condition. According to the method, the bottleneck that the oil-water emulsion is uniformly used as a homogeneous system for characterization is broken through. Based on possible different layering forms such as a free oil phase-homogeneous emulsion phase, a homogeneousemulsion phase-free water phase and a free oil phase-homogeneous emulsion phase-free water phase, mathematical expression suitable for describing the viscosity characteristics of the oil-water emulsification system under the conditions of different temperatures and different original water contents is effectively constructed.

Description

Technical field: [0001] The invention relates to a crude oil multi-phase system pipeline transportation technology, in particular to a method for determining viscosity characteristics of an oil-water emulsification system considering phase separation behavior. Background technique: [0002] Under the background of supply-side reform, oilfield development needs to combine the specific production process to explore effective ways to reduce investment and control costs from multiple dimensions. Among them, oil-water mixed transportation is a simplification for the oilfield surface production system to implement energy saving and consumption reduction, and promote cost reduction and efficiency increase. craft mode. In particular, with the development of oilfields gradually entering the medium-high water cut period, and the exploration and development of deep-sea oilfields, oil-water mixed transportation has become an efficient and inevitable process choice (Kang Wanli (Kang Wanl...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for determining the viscosity characteristics of an oil-water emulsion system that considers phase separation behavior. This method for determining the viscosity characteristics of an oil-water emulsion system that considers phase separation behavior is used to solve the problems of mixed pipeline design, operation plan optimization, and shutdown and restart. The problem of quantitative description of the flow characteristics of the oil-water emulsion system in the start-up pressure estimation link, especially to solve the problem that the determination of the viscosity parameter characterizing the flow characteristics of the oil-water emulsion system is stuck at the occurrence of unbound phase separation behavior and the oil-water mixture is qualitatively a homogeneous system Generalized questions

Images