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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 m L)。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,105mg/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4×104mg/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-resistant and salt-resistance of plugging agent, montmorillonite was introduced into AMPS-containing polymer to synthesize a composite plugging agent. The structures of the copolymers were investigated by IR, SEM and EDS. The results showed that the montmorillonite was successfully doped into the copolymer. The optimal ratio of gel water absorption The conditions were as follows: the gelation temperature was 60 ℃; the monomer molar ratio (AM:AMPS:AA) was 12: 2.5: 4; the mass fraction of the crosslinker was 0.3%; and the montmorillonite was 0.5 g (50 m L). Various factors affect the size of water absorption ratio: monomer molar ratio> cross-linking dose> gelling temperature> amount of montmorillonite. Under the condition of 70 ℃, the gel of 105mg / L Na + can maintain the intensity I for 15 days, and its thermal stability is better than that of ordinary gel (without MMT). The water absorption ratio of the common gel is better than that of the composite gel, but the heat resistance after water absorption is weaker than that of the composite gel. In 4 × 104mg / L simulated formation water for 12 h, the best water absorption at 90 ℃ was 18.29 g / g. Plugging agent has a good plugging effect, core plugging rate of up to 99.43%, breakthrough pressure gradient of 123.85 MPa / m.