A kind of preparation method of modified hydroxypropyl guar gum thickener

Abstract

The invention discloses a preparation method of a modified hydroxypropyl guanidine gum thickener. The preparation method includes the following steps that 40-65 parts of solid hydroxypropyl guanidine gum are dissolved in anhydrous ethanol 10-20 times of the gum, stirring is performed, then 15-25 parts of 2-pyrrolidone and 5-9 parts of sodium hydroxide are added, and stirring dissolution is performed for 0.5-1 hour; 15-30 parts of sodium 2-chloroethanesulfonate monohydrate is added, stirring reaction is performed for 10-15 hours under the condition of 45-65 DEG C; cooling is performed to reach room temperature, filtration is performed, a filter cake is washed with anhydrous ethanol for three times, and drying and grinding are performed to obtain powder. The preparation method has the following advantages that the preparation method is simple and easy to operate, the equipment utilization rate is high, product hydrolysis reaction can be decreased, reaction temperature does not exceed 65 DEG C, the conditions are mild and controllable, the used raw materials are wide in source, and the costs are low.

Description

technical field [0001] The invention belongs to the technical field of thickener preparation, in particular to a preparation method of modified hydroxypropyl guaridine thickener. Background technique [0002] The field of abnormally high-temperature deep-layer exploration in China is extremely broad, including Western Sichuan, Songliao Basin, North China, etc., where the burial depth and geothermal gradient are large, and the number of deep wells and high-temperature wells is increasing. With the development of deep oil and gas reservoir exploration technology, the current Some fracturing fluid systems put forward higher requirements, requiring that the fracturing fluid can maintain good temperature resistance, shear resistance and sand-carrying performance at a reservoir temperature of 180°C or even 200°C. [0003] Hydroxypropyl guaridine fracturing fluid system is widely used in fracturing construction at home and abroad because of its low cost, good stability and strong o...

AI Technical Summary

Problems solved by technology

However, due to the high-temperature and easy-to-degrade properties of vegetable glue molecules, the maximum temperature resistance is generally 170°C, which cannot meet the needs of high-temperature deep wells, and generally needs to be modified.

The commonly used hydroxypropyl guar gum modification method generally uses water as the medium, resulting in low guar gum concentration, low equipment utilization, and the hydrolysis of the guar gum molecular chain is prone to occur under alkaline conditions, and the molecular weight is reduced, which affects its gelation performance.

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