Quantitative analysis method for interfacial tension performance of petroleum crude oil ternary compound system and determination method of ternary compound system

Abstract

The invention discloses a quantitative analysis method for interfacial tension performance of a petroleum crude oil ternary compound system and a determination method of the ternary compound system. The method comprises the following steps: adding reference oil into a prepared to-be-measured ternary compound system, measuring various parameters of interfacial tension by utilizing an interfacial tension meter so as to calculate an interfacial tension value, drawing a curve of the interfacial tension value along with time change, and finding the lowest interfacial tension value sigma<min> in the curve and the corresponding ultra-low interfacial tension action time delta t so as to obtain an incidence relation among the interfacial tension performance parameters, the lowest interfacial tension value and the ultra-low interfacial tension action time, wherein the incidence relation is used for analyzing the interfacial tension performance of the ternary compound system; and obtaining the oil displacement efficiency through the interfacial tension performance indexes, and determining the ternary compound system. According to the method, the interfacial tension performance of the ternary compound system is comprehensively analyzed in a quantitative mode, guidance is quantitatively provided for determination of the ternary compound system, and the method is simple in process, objective and scientific in result and high in repeatability.

Description

technical field [0001] The invention relates to an analysis method for the interfacial tension performance of a composite system and a method for determining the composite system, in particular to a quantitative analysis method for the interfacial tension performance of a petroleum crude oil ternary composite system and a method for determining the ternary composite system. Background technique [0002] At present, the ternary compound system is a method of injecting a certain proportion of alkali, surfactant, polymer and other substances into the formation for oil recovery, especially suitable for tertiary oil recovery. In the process of oil recovery, petroleum crude oil and ternary composite system form an emulsion liquid with oil and water under the mixing action of underground porous rock and stirring of petroleum and natural gas; The interfacial tension system can also form milky liquid through strong collision and friction. This method can not only play the role of al...

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Problems solved by technology

[0003] In the prior art, the interfacial tension performance of the composite system is analyzed with the equilibrium interfacial tension value. The equilibrium interfacial tension refers to the steady-state interfacial tension value when the petroleum crude oil / composite system is contacted for a certain period of time and reaches equilibrium, but this analysis method only It can evaluate the interfacial tension performance of the stabilized petroleum crude oil / composite system, but it is not suitable for the analysis of the interfacial tension performance of the oil-water two-phase fusion process; and the interfacial tension performance is not only related to the interfacial tension value, but also related to the action time, etc. The current method cannot quantitatively analyze the performance of the interfacial tension. Therefore, in order to better guide the practical application and provide a more scientific theoretical basis for the selection of the ternary composite system, it is urgent to establish a three-component system for crude oil. A quantitative analysis method for the interfacial tension performance of the element composite system, and use it to guide the determination of the ternary composite system

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