摘要
为获得悬浮性好、耐温耐盐性能优良的调剖堵水用聚合物微球,以丙烯酰胺为聚合单体、偶氮二异丁腈为引发剂、二乙烯基苯为交联剂、脂肪醇聚氧乙烯醚硫酸钠为乳化剂合成了具有三层结构的纳米/微米聚合物微球DCA,评价了微球的耐温性、悬浮性、膨胀性及调剖堵水效果。结果表明,DCA微球粒径为0.1数30μm,外壳有纳米孔隙,微球耐温高达300℃,可在115℃放置90 d。DCA在模拟地层水中静置28 h的沉降速度为0.005 m L/min,悬浮性较好。DCA微球膨胀率随着温度的升高而升高,在115℃浸泡24 h的最大膨胀率为13.83%;对三层非均质岩心调剖堵水后含水率降低5%,采收率增幅为7%。矿场试验结果表明,经微球段塞调剖后产液量和综合含水率降低、日增油效果明显。DCA微球适用于高温高盐油藏的深部调剖堵水。
In order to obtain polymer microsphere for profile control and water shutoff with good suspension,high temperature resistance and high salinity tolerance,nanometer or micrometer polymer microsphere DCA which had a three-layer structure was synthesized by the monomer of acrylamide,initiator of azobisisobutyronitrile,crosslinking agent of divinylbenzene and emulsifier of ethoxylated lauryl alcohol sulfate. The basic performance of DCA microsphere was evaluated,including temperature resistance,suspension,expansion and plugging effect. The results showed that the particle size of DCA microsphere ranged from 0.1—30 μm and the shell had a nanoporous structure. The temperature resistance of DCA microsphere was up to 300℃,and DCA microsphere could be placed 90 days at 115℃. The sedimentation rate of DCA microsphere in simulated formation water with 28 hrs standing time was 0.005 m L/min,showing good suspension. The expansion ratio of DCA microsphere increased with increasing temperature.The maximum expansion ratio of DCA microsphere soaked 24 hrs at 115℃ in simulated formation water was 13.83%. After the experiment of profile control and water plugging with three layer heterogeneous cores,the amplitude of enhanced oil recovery was up to 7% and water-cut rate reduced by 5%. Domestic oilfield test showed that the liquid-producing capacity and water-cut rate reduced and oil increment each day was obvious after microsphere slug profile control. DCA microsphere was suitable for the deep profile control and water shutoff of high temperature and high salinity reservoir.
出处
《油田化学》
CAS
CSCD
北大核心
2016年第2期254-260,共7页
Oilfield Chemistry
基金
国家科技重大专项"油田开采后期提高采收率新技术"(项目编号2011ZX05009-004)
关键词
聚合物微球
调剖堵水
耐温性能
抗盐性能
高温高盐油藏
polymer microsphere
profile control and water shutoff
temperature resistance
salinity tolerance
high temperature and high salt reservoir
