Modified cellulose-based poly-surfactant, emulsifying viscosity reducer, preparation method of modified cellulose-based poly-surfactant and application of modified cellulose-based poly-surfactant and emulsifying viscosity reducer in viscosity reduction of thickened oil

Abstract

The invention provides a modified cellulose-based poly-surfactant, an emulsifying viscosity reducer, a preparation method of the modified cellulose-based poly-surfactant and an application of the emulsifying viscosity reducer in viscosity reduction of thickened oil, the modified cellulose-based poly-surfactant has a structure as shown in a formula I, the viscosity-average molecular weight of the modified cellulose-based poly-surfactant is 100,000-1,200,000, and the modified cellulose-based poly-surfactant is obtained by carrying out free radical copolymerization on double-bond modified cellulose and a viscosity reduction monomer. The natural cellulose with large specific surface area and rich surface grafting sites is utilized, a large number of viscosity reducing monomers are introduced to the surface of the natural cellulose, the thick oil can be effectively emulsified, the viscosity of the thick oil is reduced, the cellulose in the viscosity reducer can be adsorbed on the surface of oil drops, oil drops can be prevented from being gathered, the emulsified state of the crude oil is maintained for a long time, the crude oil transportation is facilitated, and the viscosity of the crude oil is reduced. Meanwhile, cellulose is biodegradable and has no influence on the quality of crude oil.

Description

technical field [0001] The invention belongs to the technical field of viscosity reducer preparation, and in particular relates to a modified cellulose-based polysurfactant, an emulsified viscosity reducer, a preparation method thereof and an application in viscosity reduction of heavy oil. Background technique [0002] With the continuous consumption of petroleum resources, the reserves of high-quality light crude oil are also decreasing day by day. Therefore, how to better develop unconventional oil reservoirs such as high-wax heavy oil, heavy oil, and extra-ultra-heavy oil has attracted widespread attention from researchers at home and abroad. my country is rich in heavy oil resources, and more than 70 heavy oil fields have been discovered in 12 basins across the country. However, due to the complex composition, poor fluidity, and high viscosity of heavy oil, traditional extraction techniques cannot be fully recovered. The development of an efficient and universal chemic...

AI Technical Summary

Problems solved by technology

The microbial viscosity reduction method has little damage to the formation and is environmentally friendly, but it is difficult to separate microorganisms suitable for growth in a specific reservoir environment, and it is also difficult to reduce and eliminate the influence of reservoir environmental factors on microorganisms

Emulsion viscosity reduction, as a heavy oil viscosity reduction method with relatively high viscosity reduction efficiency, has been widely used in the viscosity reduction, exploitation and transportation of heavy oil crude oil, in which different types of surfactants mainly play a role, but there are Poor salt tolerance, high cost, poor stability, etc.

Images