针对目前降失水剂耐温抗盐能力不足、综合性能差等问题,以改性nano-SiO₂、AMPS、AM、MA和SSS为原料,通过自由基水溶液共聚法制备了一种新型水溶性聚合物基纳米SiO₂复合物P(AAMS)/nano-SiO₂来提高固井水泥浆高温高盐环境下的控失水能力,从而提高固井质量,保障油气资源的高效安全开采。利用红外、核磁等手段表征了P(AAMS)/nano-SiO₂的结构,并对P(AAMS)/nano-SiO₂水泥浆体系的控失水、耐温、抗盐及其他基本施工性能进行评价。结果表明,P(AAMS)/nano-SiO₂可明显提高水泥浆在高温高盐环境下的控失水能力,当P(AAMS)/nano-SiO₂掺量为0.9%时,其水泥浆在120℃下的失水量为44 mL;在含10%~30%NaCl盐水的水泥浆中,P(AAMS)/nano-SiO₂掺量为1.2%时,水泥浆的失水量仍小于50 mL,能满足固井施工要求,对水泥石的力学性能、稠化性能等其他基本工程性能无不利影响。

Current fluid loss reducer has the problems such as insufficient temperature resistance,insufficient salt resistance and poor comprehensive performance.A novel water-soluble polymer-based nano-SiO₂ composite,P(AAMS)/nano-SiO₂,is prepared through free radical aqueous solution copolymerization method with modified nano-SiO₂,AMPS,AM,MA and SSS as raw materials,aiming to improve the water loss control ability of cementing slurry under high temperature and high salt environment,therefore improving the cementing quality and ensuring the efficient and safe exploitation of oil and gas resources.Firstly,the structure of P(AAMS)/nano-SiO₂ is characterized by means of IR and NMR.Secondly,the water loss control,temperature resistance,salt resistance and other basic construction performance of P(AAMS)/nano-SiO₂ cement slurry system are evaluated.The results show that P(AAMS)/nano-SiO₂ can significantly improve the water loss control ability of cement slurry in high temperature and high salt environment.The water loss of cement slurry is 44 mL at 120℃ when the content of P(AAMS)/nano-SiO₂ is 0.9%.The water loss of cement slurry that contains 10%-30% NaCl is still less than 50 mL when the content of nano-SiO₂ is 1.2 wt%,which can meet the requirements of cementing operation.It is indicated that 1.2% P(AAMS)/nano-SiO₂ cement slurry has no adverse effect on mechanical properties,thickening properties and other basic engineering properties of cement paste.

刘欢(1994-),男,硕士,工程师,研究方向为油田固井材料,1442162749@qq.com。