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Overview Ihavehydroxypropylguar gumon thesynthesis mechanismand process conditionsvery different fromthe past, the use ofa stepin thesynthesis ofwater-bornecatalyticphase shiftmethod,adda specialphase transfer catalyst,the productoftheperformanceindicators hadimproved greatly.Fracturing fluidthickeneris mainly used foroilfield productionby injectionprocess, especially for theoiltemperature higher than100 ℃deep wellfracturingoil and gas fields.