Water-based fracturing fluid thickening agent and synthetic method thereof

Abstract

The invention belongs to the field of chemical engineering, and particularly relates to a water-based fracturing fluid thickening agent and a synthetic method thereof. The thickening agent comprises substances in parts by weight as follows: acrylamide, methacrylamide, undecylenic acid, 2-acrylamide-2-methylpropane sulfonate, methacryloyloxyethyl trimethyl ammonium chloride, dodecafluoroheptyl methacrylate, vinyl pyrrolidone, modified corn starch, an initiator and water. The synthetic method of the thickening agent comprises steps as follows: various co-monomers and modified starch are prepared in deionized water in proportion; the PH value and the temperature of the solution are adjusted; high-purity nitrogen is fed for oxygen removal; the compound initiator is added to initiate a reaction. The thickening agent is a multifunctional high-molecular polymer which is easily soluble, free of pollution and damage, good in sand carrying property and particularly good in temperature resistance and anti-shearing sand carrying property. The thickening agent has main characteristics of wide use temperature range as well as high temperature resistance and shearing resistance, has characteristics that the thickening agent is high in sand carrying property, free of residues, causes no damage to reservoir and the like, and can be used as an excellent substitute for guanidine gum.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a water-based fracturing fluid thickener and a synthesis method thereof. Background technique [0002] Fracturing is a conventional stimulation technique. Its purpose is to press the reservoir out of the fracture, thereby increasing production. The fracturing fluid used in fracturing must have the characteristics of high viscosity, high shear resistance, high sand-carrying strength, and environmental protection without residue after breaking the gel. High viscosity can make cracks, and only high viscosity can make the cracks reach the required width and depth. As the main agent of water-based fracturing fluid, the thickener is used to increase the viscosity of the fracturing fluid, reduce the fluid loss of the fracturing fluid, suspend and carry the proppant. At present, the thickeners used in water-based fracturing fluids are mainly natural plant gums and their de...

AI Technical Summary

Problems solved by technology

However, it is reported that the commonly used guar gum fracturing fluid system will not only form a filter cake on the surface of the fracture, but also leave some residue in the formation and fractures, causing secondary damage

After the analysis of the fracturing fluid flowed back from the well to the surface after fracturing, it is concluded that during the fracturing operation, the fracturing residual fluid discharged only accounts for 30% of the guar gum fracturing fluid pumped into the well. %~50%, at the same time, it has the disadvantages of complex preparation process and high content of water insoluble