Water-based fracturing fluid thickener and method for preparing same

Abstract

The invention provides a water-based fracturing fluid thickener and a method for preparing the same. The water-based fracturing fluid thickener comprises acrylamide, 2-acrylamido-2-methyl-1-propanesulfonic acid, N-vinyl pyrrolidone, acrylic acid, a complexing agent, a chain transfer agent, sodium hydroxide solution, an initiator and water. The method comprises the following steps of: mixing the 2-acrylamido-2-methyl-1-propanesulfonic acid, the acrylic acid, water and the sodium hydroxide solution, wherein the pH value of a mixed solution is 3-11; adding the complexing agent to purify a solution of reaction, and adding the chain transfer agent at the same time to prevent cross-linking; adding the N-vinyl pyrrolidone and the initiator, and finally carrying out reaction to obtain the water-based fracturing fluid thickener. If the mass fraction of the water-based fracturing fluid thickener in a water-based fracturing fluid is 0.35%, the apparent viscosity is 140mPa.s. When being sheared continuously for 30 minutes under the condition of 170S<-1> and 95 DEG C, the water-based fracturing fluid thickener has the viscosity retention rate of more than 60%.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid, in particular to an aqueous agent and a preparation method thereof. Background technique [0002] Fracturing fluid is the liquid used in the mining process of fluid mines such as gas, oil, fresh water, brine and hot water, in order to obtain high yield by means of liquid conduction pressure measures. Fracturing fluids are mainly divided into water-based fracturing fluids, oil-based fracturing fluids, alcohol-based fracturing fluids, and foam fracturing fluids. Due to the advantages of low cost and good performance, water-based fracturing fluid is widely used at home and abroad. [0003] Thickener is the main chemical component in fracturing fluid, and the performance of thickener directly affects the performance of fracturing fluid. There are many kinds of thickeners used in water-based fracturing fluids, mainly including natural vegetable gum and its derivatives, cellulose derivatives...

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Problems solved by technology

[0006] The application number is 200610040703.2 Chinese patent discloses a high temperature resistant non-harmful fracturing fluid thickener and its preparation method and application. The present invention uses fatty acid and low molecular weight polyethylene glycol or polypropylene oxide to esterify, or in Under catalysis, add ethylene oxide or / and propylene oxide to long-chain fatty alcohols, fatty acids or fatty amines to connect the long-chain hydrophobic groups with the solubilizing segment; then convert the terminal hydroxyl group of the solubilizing segment into a halogen Atoms, react with excess tertiary amine, or react the terminal hydroxyl group of solubilizing segment with sulfonating reagent; add 1~3 parts by weight of the thickener and 0.05~0.4 parts by weight of high temperature stabilizer to 2~3 parts by weight of halogen In the base fluid made of salt and 100 parts by weight of water, a high-temperature-resistant and harmless fracturing fluid that can be used for oil and gas field stimulation can be obtained, but the preparation of the fracturing fluid disclosed in this invention is relatively complicated

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