Twin cationic surfactant fracturing fluid applied to coalbed methane well

in order to reduce the harm to the coal reserv irthe twin cationic suractant and gel breaker were sythesized and the contrllable gel breaking twin catonic suractant fracturing fuid system was optimized and formed.The studyresuts showed tht the chain length of the suractant would be 2 times longer than the conwentional single chain surfactant n comparison with the conventional suractant.the concentration ofthe twin cationic suractan could be reduced by over 50%.The system reaized a contola ble gel breaking at a low temperature.Under the temperature of 30 C.the visosity of the gel brealer ould reach 3 m Pas within 2 ~8 h and an uncontroable problem of the gel breaking time was soved for the suriactant ractrin fui .The twincatinic surfactantfracturing fuid system with alovw appied concentration.high fracturing capacityess harm to coal reservoi( ham rate less than 20%)a low cost environment riendlycortrollable gel breaking and otherfeatures was favorable to the fracturing liquid system of the coalbed methane reconstructon.The system was applied to 65 welswith a good efct individully