Clean fracturing fluid and use thereof

[0034] Example 1. Synthesis of thickener N-oleic acid amidopropyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0035] In a 1000L synthesis kettle, add 460Kg of oleic acid, and then add 183Kg of N,N-dimethylpropanediamine, stirring while adding, after the addition, the temperature is raised to 150℃±5℃, and the reaction is about 6hr. Samples are taken regularly during the reaction. , Determine the amine value of the mixture with a standard hydrochloric acid solution. When the amine value of the reactant does not change, the temperature is reduced to 60°C, 20Kg of ethanol is added, and the mixture is stirred evenly. Add 232Kg of 3-chloro-1,2-propanediol, adjust the pH value of the reactant between 7-8 with 20% NaOH aqueous solution, heat up to 80℃±5℃, reflux for 5hr to obtain the product N-oleic acid amide Propyl-N-(1,2hydroxy-propyl)-N,N-dimethylammonium chloride.

[0036] Example 2. Synthesis of thickener N-erucamide propyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0037] In a 1000L synthesis kettle, add 414Kg of sinapinic acid, then add 207Kg of N,N-dimethylpropanediamine, and stir while adding. After the addition, the temperature is raised to 160℃±5℃, and the reaction is about 6hr. Samples are taken regularly during the reaction Determine the amine value of the mixture with a standard hydrochloric acid solution. When the amine value of the reactant does not change, the temperature is lowered to 60°C, 21Kg of ethanol is added, and the mixture is stirred evenly. Add 263Kg of 3-chloro-1,2-propanediol, adjust the pH value of the reactant between 7-8 with 20% NaOH aqueous solution, raise the temperature to 80℃±5℃, reflux for 5hr to obtain the product N-erucamide propyl Group-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride.

[0038] Example 3. Synthesis of thickener N-erucamide propyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0039] In a 1000L synthesis kettle, add 440Kg of erucic acid methyl ester, and then add 207Kg of N,N-dimethylpropanediamine, stirring while adding, add 3.3Kg of KOH as a catalyst after the addition, and heat to 160℃±5℃, The reaction is about 6 hours. Samples are taken regularly during the reaction. The amine value of the mixture is measured with a standard hydrochloric acid solution. When the amine value of the reactant does not change, the temperature is reduced to 60°C, 21Kg of ethanol is added, and the mixture is stirred evenly. Add 263Kg of 3-chloro-1,2-propanediol, adjust the pH value of the reactant between 7-8 with a 20% NaOH aqueous solution, raise the temperature to 80°C ± 5°C, reflux and react for 5 hours to obtain the product.