为提高堵水剂耐温抗盐性，将蒙脱土引入含AMPS的聚合物中，合成了一种复合堵水剂。通过红外、SEM、EDS等对其结构进行分析，并对其进行吸水倍率、封堵率等性能进行探究，结果表明：蒙脱土成功掺杂进了共聚物；凝胶吸水倍率的最优合成条件为：成胶温度为60℃；单体摩尔比（AM：AMPS：AA）为12：2.5：4；交联剂质量分数为0.3%；蒙脱土为0.5 g （50 mL）。各因素影响吸水倍率的大小：单体摩尔比 > 交联剂量 > 成胶温度 > 蒙脱土量。70℃条件下，10⁵ mg/L的Na⁺中成胶15 d仍能保持强度I，且热稳定性强于普通凝胶（不加蒙脱土）。普通凝胶的吸水倍率优于复合凝胶，但吸水后的耐热性弱于复合凝胶。在4×10⁴ mg/L的模拟地层水中浸泡12 h，90℃时吸水性能最好，可达18.29 g/g。堵水剂具有良好的封堵效果，岩心封堵率可达99.43%，突破压力梯度达123.85 MPa/m。

In order to improve the temperature resistance and salt resistance of water plugging agent,a plugging agent is synthesized through using montmorillonite to modify the polymer that contains 2-acrylanmido-2-methylpropanesulfonic acid (AMPS).The structure of the synthesized polymer is analyzed by infrared spectrometer,SEM and EDS,and its properties such as water absorption rate and sealing rate of the gel are investigated.The optimal synthesis conditions are proposed as that gelling temperature is 60℃,m(AM):m(AA):m(AMPS)=12:2.5:4,mass fraction for cross-linking agent is 0.3%,dosage of montmorillonite is 0.5 g (50 mL).The influence ability of various factors on the water absorption rate are as follows:mole ratio of monomer > dosage of cross-linking agent > gelling temperature > montmorillonite dosage.In the 10⁵ mg·L^-1 NaCl solution at 70℃,the composite gel has still maintained the strength I after 15 days since it is synthesized,and its thermal stability is stronger than common gel without montmorillonite.The common gel has a better water absorption rate than composite gel,but its heat resistance after absorbing water is weaker than the composite gel.When composite gel has been soaked in 4×10⁴ mg·L^-1 of simulated formation water for 12 h,its water absorption rate reaches the best at 90℃,being 18.29 g·g^-1.Besides,it is of great plugging performance.Its plugging rate against matrix core is up to 99.43%,and breakthrough pressure gradient is 123.85 MPa·m^-1.

李林(1990-),男,在读研究生,主要从事油田用高分子的研究,1319101423@qq.com