Abstract:

Ternary copolymer of AMPS/AM/AMC₁₄S has been synthesized by using the method of initiation polymerization. Experimental evaluation of indoor basic properties shows that the ternary copolymer has relatively good temperature-resistance and salt-resistance. Under the condition of 90℃ and brine water with salinity of 16×10⁴ mg/L, the viscosity of AMPS copolymer with concentration of 3 000 mg/L has a retention rate of 39.5% when the temperature of AMPS's solution rises from 30℃ to 90℃;and this solution,after a 90-day ageing test, the viscosity of AMPS copolymer has a retention rate of 61.3% under the same condition. However,the viscosity of ternary copolymer solution has not been obviously reduced with the increase of calcium ion concentration, while the viscosity of HPAM solution has been reduced by 89%.The ternary copolymer produced during trial production has been tested in the Wei 18-4 well group, when driving liquid of polymer has been transferred to water driving, developing pressure also changes from 15.4 MPa to 13.5 MPa, all the water cuts in 4 wells are 2.5 percent less than that before polymer being injected, and daily oil production has been increased,i.e. 2～4 t more than that before polymer being injected.

Key words: temperature-resistance and salt-resistance, AMPS ternary copolymer, driving liquid of polymer, polymer injection