Colloidal dispersing gel oil flooding technique suitable for high-temperature and high-salinity reservoirs of Zhongyuan oilfield and its application

Under the conditions of high temperature and high salinity,the temperature-resistant and salt-proof gel system featured by colloidal dispersion has been developed and prepared with the help of low concentration AM/AMPS/AMC14S ternary copolymer and compounded organic cross-linking agent. The influences of polymer type and its concentration,cross-linking agent concentration and PH value upon the gelling viscosity of the system are investigated.At constant temperature of 90℃ and after aging test for 90 days,the viscosity still maintains at more than 400mPa·s.The above system has been applied in the pilot of Zhongyuan oilfield and its results of increasing oil production and reducing water cut are pretty obvious.