纳米SiO2复合降粘剂的合成与性能评价

Synthesis and performance evaluation of Nano-silica composite viscosity reducer

摘要:

以丙烯酸十八酯、4-乙烯基吡啶、丙烯酰胺为单体与纳米SiO2接枝共聚，偶氮二异丁腈为引发剂，甲苯为反应溶剂，通过自由基聚合，制备了一种油溶性纳米复合共聚物，该纳米复合共聚物具有降低稠油粘度的作用。通过单因素试验，考察了单体配比、SiO2质量比、降粘剂用量、温度和剪切速率对降粘率的影响。以胜利油田的陈平稠油为对象，评价了降粘剂的性能。结果表明，在50 ℃，10 s-1测试条件下，降粘剂加量为700 mg/kg时，表观降粘率为69.1%，净降粘率为34.0%，降粘性能优于纳米SiO2和市售降粘剂EVA，表现出良好的降粘效果。

Abstract:

An oil-soluble nanocomposite copolymer was prepared by free radical polymerization, using octadecyl acrylate, 4-vinylpyridine and acrylamide as monomers, azobisisobutyronitrile as initiator and toluene as reaction solvent, graft copolymerization with nano-silica. The nanocomposite copolymer can reduce the viscosity of heavy oil. The influences of monomer ratio, SiO2 mass ratio, viscosity reducer dosage, temperature and shear rate on viscosity reduction were investigated by single factor experiment. The performance of viscosity reducer is evaluated by the chenping heavy oil of shengli oilfield. The results show that nanocomposite copolymer is effective in reducing the viscosity of chenping heavy oil and superior to nano-SiO2 and EVA on the market. When the addition of viscosity reducer is 700 mg/kg, apparent viscosity reduction rate of heavy oil is 69.1%, and the net rate of viscosity reduction is 34.0%, under the test condition of 50 ℃, 10 s-1.