PROFILE MODIFICATION BY HYDROPHOBIC ASSOCIATING POLYMER SYSTEM IN LOW PERMEABILITY RESERVOIR

Profile modification technology by hydrophobic associating polymer is to add crosslinker to polymer to compose three dimension structure by controlling the composed time and strength, which can improve the weakness of salt resistance, temperature endurance and shearing resistance existing in sole polymer system. According to Mazhai Oilfield’s specialties, through a series of parameter tests and evaluation to viscosity-density, viscosity-temperature, stability, salt and shearing resistance, it shows that the investigated Mazhai Oilfield’s hydrophobic associating polymer has the high characters of temperature endurance, salt resistance and shearing restress. In the condition of 95℃ and Mazhai injection water, the 3000 mg/L polymer viscosity is only 64 mPa.s. Compared with polyacrylamide and AMPS polymer, its viscosity can be up to hundreds times of them and higher. Site application has verified that it has the great potencies to increase the production, and shows that this system can fit for the use as to promote the production in low permeability oil field reservoirs.