SYNTHESIS AND EVALUATION OF A NOVEL MODIFIED GUAR THICKENER FOR FRACTURING FLUIDS.

Fracturing technology is one of the main methods for the development of low-permeability and low-pressure oil and gas reservoirs. Thickener is the key treatment agent in the fracturing fluid to improve the fracturing effect. The guar film is reacted with chloroacetic acid and propylene oxide under the action of sodium hydroxide to form carboxymethylhy-droxypropyl guar. By detailed and precise observation and analysis of the performance of the modified product affected by factors such as the amount of propylene oxide, the material ratio, and the reaction temperature, the most suitable synthetic process conditions were determined. The volume ratio of the guar film, sodium hydroxide, ring oxypropane, and chloroacetic acid is 1: 0.2: 0.15: 0.2. The components were alkalized at 25℃ for 40min, and etheri-fied at 85℃ for 3h. The insoluble content of carbox-ymethylhydroxypropyl guar gum reduced to about 3 %. The viscosity of the product is 110mPa s, which is higher than industry indicators. [ABSTRACT FROM AUTHOR]