A method for characterizing the gelation and nucleation kinetics of waxy crude oil emulsion

Abstract

The invention relates to a method of representing a gelation nucleating kinetics process of waxy crude oil emulsion. The method comprises steps of (1) determining latent heat released in cooling gelation; (2) according to a law of thermodynamics, establishing a relationship between latent heat released by a waxy crude oil emulsion system and quantity of gelation cores formed by wrapping dispersedphase water droplets by precipitated wax crystal, and determining cooling gelation nucleating quantity; (3) establishing a relationship between latent heat of cooling gelation and temperature and gelation nucleating rate; (4) creating a dispersed phase water droplet size and mas fraction distribution determining method; and (5) quantitatively representing cooling gelation nucleating rate of waxy crude oil emulsion. Impact of the oil-water emulsification role on the waxy crude oil gelation nucleating behavior is associated and represented according to the full correlation of thermodynamic property of the waxy crude oil emulsion and a cooling gelation characteristic parameter of the waxy crude oil emulsion, therefore, a method of quantitatively representing the gelation nucleating kinetics process of waxy crude oil emulsion is provided, and is highly scientific, operable and practical.

Description

[0001] 1. Technical field: [0002] The present invention relates to the description of the emulsification and gelation nucleation behavior of waxy crude oil in the pipeline and the understanding of the emulsion gelation deposition mechanism when developing and applying the flow assurance technology in the oil-water mixed transportation process of the oilfield gathering and transportation project. It is a method to characterize the kinetic process of gelation nucleation of waxy crude oil emulsion. [0003] 2. Background technology: [0004] As my country's oilfields have successively entered the stage of medium-high water-cut exploitation, especially in recent years, significant progress has been made in the exploitation of offshore oil and gas resources. It has become very common to transport oil based on normal and low-temperature process modes, and the composition characteristics of waxy crude oil determine that as the oil temperature decreases, the wax crystals in it will co...

AI Technical Summary

Problems solved by technology

[0007] One object of the present invention is to provide a method for characterizing the gelation and nucleation kinetics of waxy crude oil emulsion, which is used to solve the problem of describing the nucleation behavior of waxy crude oil emulsion gelation and the mechanism of emulsion gelation and deposition in oil-water mixed pipelines The problems revealed, especially the constraints on paraffin precipitation and crystallization-induced nucleation kinetics that are more difficult to identify due to the presence of emulsified water, and are currently limited to qualitative analysis and description without quantitative characterization

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