Coagulation-reducing viscosity-reducing agent for high-coagulation thickened oil

Abstract

The invention relates to a coagulation-reducing viscosity-reducing agent for high-coagulation thickened oil. By weight percentage, the coagulation-reducing viscosity-reducing agent for the high-coagulation thickened oil comprises the following materials: 0.1% to 0.2% of anion polyacrylamide, 5% to 10% of sodium acrylate-setanol acrylate copolymer, 5% to 15% of sodium dodecyl benzene sulfonate, 1%to 2% of mixture of hexafluoropropylene oxide dipolymer amide sulphobetaine and hexafluoropropylene oxide dipolymer amide amine oxide, 1% to 2% of sodium hydroxide and the balance water. The coagulation-reducing viscosity-reducing agent can disperse high-coagulation thickened crude oil, reduces the freezing point of the crude oil to above 0 DEG C and enables the viscosity of the crude oil to be smaller than 300mPa*s at the normal temperature. The using concentration of the coagulation-reducing viscosity-reducing agent can be controlled at 0.1% to 0.5%, is lower by one magnitude order than that (3% to 7%) of a traditional surfactant, is not limited by hydrophile-lipophile balance values and phase inversion temperature (PIT) and can emulsify the high-coagulation thickened oil at the temperature above the freezing point of the crude oil.

Description

technical field [0001] The invention relates to a pour point and viscosity reducer for high pour point thick oil, which belongs to the field of viscosity reducer for petroleum exploitation. Background technique [0002] Some existing crude oils are high-condensing heavy oils, whose freezing point is usually above 40°C, and high-condensing heavy oils have the characteristics of high viscosity and high freezing point. Below the freezing point, their fluidity is very poor, and it is very difficult to mine and transport them. . [0003] There are certain reserves of highly pouring heavy oil in many oilfields in my country. The existing extraction methods of high pour point heavy oil mainly include thermal oil recovery method, pour point and viscosity reduction method mixed with thin oil, chemical pour point reduction and viscosity reduction method, etc. Thermal oil recovery methods mainly include electric heating, steam heating and other methods, which usually consume a lot of...

AI Technical Summary

Problems solved by technology

[0004] However, it is difficult for common pour point and viscosity depressants to simultaneously reduce the viscosity and freezing point of high pour point heavy oil so that it can meet the production requirements.

The pour point depressing range of conventional pour point and viscosity depressants for pour point oil is usually within 10°C, which is difficult to meet the development and transportation of high pour point heavy oil under normal temperature and low temperature conditions.