耐温抗盐的AMPS三元共聚物在高温、高矿化度油藏的应用

APPLICATION OF TEMPERATURE-RESISTANT AND SALT-RESISTANT TERNARY COPOLYMER(AMPS) IN HIGH-TEMPERATURE AND HIGH SALINITY RESERVOIRS

吴应川

Wu Yingchuan

用引发聚合方法合成了AMPS/AM/AMCS三元共聚物。室内基本性能实验评价表明,三元共聚物的耐温抗盐性较好。在温度90℃、矿化度为16×10mg/L盐水条件下,浓度为3000mg/L的AMPS共聚物溶液从30℃升到90℃时,产品粘度保留率为39.5%;同样条件溶液经过90天的老化试验,粘度保留率为63.1%;随着钙离子浓度的增加,三元共聚物粘度下降不明显,而HPAM溶液粘度下降了89%。使用中试产品在卫18-4井组开展了先导性矿场试验,聚合物驱转为水驱后,压力由15.4MPa降为13.5MPa,4口井的含水低于注聚前的含水基质25个百分点,日产油高于注聚前2～4t。

Ternary copolymer of AMPS/AM/AMCS 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 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.

10.11743/ogg20030213