Preparation method of heat-resistance and salt-tolerance polyacrylamide

Abstract

The invention discloses a preparation method of heat-resistance and salt-tolerance polyacrylamide. The preparation method comprises the following steps: taking the aqueous solution of acrylamide with the mass concentration of 20-30 percent, adding acrylic acid accounting for 1-2 percent of the mass of an acrylamide monomer and 2-acrylamide-2-methylpropane sulfonic acid (AMPS) accounting for 2-6 percent of the mass of the acrylamide monomer, adding sodium hydroxide for regulating a pH value to 5.5-6.5, cooling to 0-4 DEG C, introducing nitrogen to remove oxygen out of the system, sequentially adding a complexing agent, an azo initiator, an efficient chain transfer agent, a reducing agent and an oxidant when the oxygen content in the system is smaller than 0.01 percent, sealing after reaction is finished, preserving heat for 1-1.5h, then taking out colloid, putting the colloid in a hydrolyzer, adding an inorganic alkali liquor accounting for 6-13 percent of the acrylamide monomer, hydrolyzing at the temperature of 80-90 DEG C for 1-2h, and drying the colloid to prepare the product. The heat-resistance and salt-tolerance polyacrylamide is good in solubility and filterability, and the apparent viscosity of the heat-resistance and salt-tolerance polyacrylamide is above 11mPa.s.

Description

Technical field [0001] The present invention is a functional polymer field, which specializes in the preparation method for a three -time oil field of oil field use of oil field. Background technique [0002] Petroleum is an important basic raw material for energy and chemical industry. International crude oil prices continue to rise, which has stimulated measures for crude oil in various countries.From the current technological level, three oil recovery with polymer oil as the core has become an oil field leading development method that is commonly used in industrial applications, and has entered a new period of rapid development.Among them, the mining problems of II and III collection of category III, which account for more than half of the total resource, pay more and more attention. At present, the temperature of the resource streaming of the resource hidden resource hidden in Class II and III is 70-95 ° C, and the level of mineralization is 10,000 to 30,000 mg / L. The second ...

AI Technical Summary

Problems solved by technology

Among them, more and more attention has been paid to the mining of Type II and III oil reservoirs, which account for more than half of the total resources. At present, the formation temperature of Type II and III oil reservoir resources is 70-95°C, and the salinity of the formation is 10,000-30,000mg / L. The ion is 800mg / L. Under this condition, the commonly used hydrolyzed polyacrylamide (HPAM) will suffer from severe thermal degradation, increased degree of hydrolysis, and precipitation when encountering high-valent ions, and the viscosity-increasing effect will become poor.