Viscous self-emulsifying system as well as preparation method and application thereof

Abstract

The invention discloses a viscous self-emulsifying system which comprises a betaine type surfactant and an auxiliary agent, and the mass ratio of the betaine type surfactant to the auxiliary agent is 1: (0: (01-0.8)). The invention also discloses a preparation method of the viscous self-emulsifying system, which comprises the following steps: (1) taking the betaine type surfactant according to the formula ratio, heating and stirring; and (2) adding the auxiliary agent according to the formula ratio, uniformly stirring, and cooling to room temperature to obtain the viscous self-emulsifying system. The viscous self-emulsifying system is used as a viscous oil field viscosity reducer. The invention has the following beneficial effects: 1, the preparation method is simple; 2, the viscous self-emulsifying system is good in dissolving property, high in thick oil emulsifying speed and not prominent in oil selectivity; and 3, the aqueous solution of the viscous self-emulsifying system has viscosity and activity, and can reduce the viscosity of crude oil, improve the oil washing efficiency and improve the recovery efficiency of a heavy oil field while changing the microscopic balance of oil and water in a stratum, emulsifying the crude oil and stripping the crude oil.

Description

technical field [0001] The invention belongs to the field of oilfield development, in particular to a viscous self-emulsifying system and its preparation method and application. Background technique [0002] With the rapid development of China's economy, domestic energy consumption is increasing day by day, and the demand for oil is increasing year by year. [0003] Heavy oil resources occupy an important position in the global crude oil reserves, and countries have gradually paid more attention to the development of heavy oil resources. China is very rich in heavy oil resources, and the amount of heavy oil resources can reach 300×10 8 t, and widely distributed, more than 70 heavy oil fields have been discovered in 12 basins. my country's offshore oil and gas resources are mainly located in China's Bohai Sea, East China Sea and South China Sea. The vast majority of offshore oil and gas resources are heavy oil resources, which are difficult to develop. [0004] Heavy oil r...

AI Technical Summary

Problems solved by technology

At present, the commonly used methods include water flooding heavy oil and then turning to thermal recovery to enhance recovery. In this way, the permeability of the formation is generally 0.076μm 2 to 36μm 2 When it is within the range, the permeability has little effect on the residual oil saturation after steam breakthrough. In high permeability formations, the permeability is directly related to the residual oil saturation. This technology has received certain acceptance in practical applications. limits

The other is water flooding of heavy oil followed by chemical flooding to enhance oil recovery. Due to the impact of high temperature, high salt and low permeability, this technology has high requirements for the tolerance of chemical agents, and it has not been widely used at present.

Images