Ternary copolymer of AMPS/AM/AMC

14

S 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 16×10

4

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.