Heat-resistant salt-tolerant water-soluble amphiphilic polymer composite thick oil viscosity reducer

Abstract

The invention discloses a heat-resistant salt-tolerant water-soluble amphiphilic polymer composite thick oil viscosity reducer which is compounded by a component A and a component B, wherein the component A is an amphiphilic polymer formed by quaternary copolymerization of acrylamide, hydrophobic alkyl acrylamide, acrylamide alkyl ammonium chloride quaternary ammonium salt and nonionic polyether acrylate; and the component B is a small molecular surfactant. The viscosity reducer has a better viscosity reduction effect against thick oil with different viscosities, in particular to the thick oil with medium-high and ultra-high viscosities, the viscosity reduction rate against the thick oil with a medium-low viscosity exceeds 95%, and the viscosity reduction rate against the thick oil with the medium-high and ultra-high viscosities exceeds 85%.

Description

technical field [0001] The invention relates to a water-soluble viscosity reducer for heavy oil production, in particular to a temperature-resistant and salt-resistant water-soluble amphiphilic polymer composite heavy oil viscosity reducer, which is suitable for viscosity reduction in heavy oil wellbore, heavy oil production, and oil collection and transportation . Background technique [0002] Viscous oil, known internationally as heavy oil, is a complex multi-component organic mixture and an important part of the world's petroleum resources. Poor sex. my country is rich in heavy oil reserves. The proven oil reserves are about 5 billion tons, of which 1.4 billion tons are heavy oil, accounting for about 30% of the total oil reserves. It is the fourth largest heavy oil in the world after the United States, Canada and Venezuela. In producing countries, with the deepening of oil resources development and the reduction of world oil reserves, the exploitation and utilization te...

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Problems solved by technology

[0006] The present invention aims at the problem of poor temperature and salt resistance, high use concentration and low viscosity reduction rate of high asphaltene colloid and medium to high viscosity heavy oil of simple small molecule surfactant heavy oil viscosity reducer, and develops and provides a new type of composite heavy oil Viscosity reducer is a new type of water-soluble heavy oil viscosity reducer with temperature resistance, salt resistance, high surface activity, high molecular weight, low use concentration, obvious advantages in viscosity reduction for medium and high viscosity heavy oil, dispersion emulsification and viscosity reduction, especially It is suitable for the development and application of heavy oil fields with high salinity, high temperature, medium-high and ultra-high viscosity, and has broad market prospects

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