耐温耐盐聚合物堵剂的制备及性能研究

针对高温高矿化度地质条件特点,合成了对苯乙烯磺酸钠–2–丙烯酰胺基–2–甲基丙磺酸–膨润土聚合物堵剂。采用不同浓度盐溶液、使用温度及时间评价其耐盐耐温性能,优化了携带液体系,采用岩芯模拟实验考察堵剂封堵效果及耐冲刷性能。结果表明:该堵剂在80～130℃恒温放置60 d后树脂的吸水率和强度基本保持不变,树脂耐温性能良好;在质量分数30%的模拟盐水溶液中吸水率仍可达12.00 g.g 1,树脂的耐盐性能良好;树脂在含水40%的乳化油中3 h不膨胀;岩芯实验测定聚合物堵剂在高渗和中渗通道中封堵率达到99.96%和96.41%,经30 PV水长期冲刷封堵率仍可达95.12%和94.43%。

Synthesis and Characterization of Temperature-tolerant and Salt-resistant Polymer Hydrogel

A polymer hydrogel is studied which is available for high temperature and high salinity condition,the SSS/AMPS/bentonite polymer hydrogel is prepared in the lab.The properties of the hydrogel are evaluated using the change of water absorbency in salt solutions of different concentration,different temperatures and different time and the carrier fluid is optimized.By single core flow experiment,the shutoff capacity and erode resistant of the block agent are studied.The results show:the water absorbency and strength keep constant under 80～130 ℃ for 60 days;the water absorbency can reach 12.00 g.g 1 in the salt solution of 30%;the polymer hydrogel has well property of temperature-tolerant and salt-resistant.The hydrogel is not swollen in the oil containing 40% water inside within 3 hours.The shutoff efficiency of high permeable formation and medium permeable formation are 99.96% and 96.41% respectively;the efficiency can still reach 95.12% and 94.43% after 30PV eroding.