不同预处理工艺对聚硅纳米材料增注效果的影响研究

Research on the influence of different pretreatment technology on augmented injection effect of nanometer polysilicon material

为了进一步提高聚硅纳米材料对低渗注水井的降压增注效果,通过吸附润湿实验考察了不同预处理方式对聚硅纳米材料在岩石表面吸附的影响,同时通过岩心流动实验研究了碱化、酸化、碱化+酸化预处理工艺与纳米处理组合工艺对低渗岩心的改善效果,实验结果表明,采用碱化+酸化预处理后再进行纳米处理的增注效果最好,处理后的最终渗透率与初始渗透率比值K_2/K_0可达6.07;该处理工艺在现场实施了5井次,效果良好,平均单井降压幅度达9.7 MPa,平均单井增注3 819 m^3,平均有效期超过7个月仍继续有效。

In order to further increasing the depressed pressure and augmented injection ef- fect of nanometer polysilicon material in the low permeability oilfield, the influence of different pretreatment technology on the rock surface absorption of nanometer polysilicon material is studied by taking tests of the surface adsorption and wettability ,at the same time, by way of core-flooding tests, the Influence of the technology of pre-alkalization , pre-acidifieation , pre-alkalization and pre-aeidification coordination with nanometer pretreatment on the rock surface adsorption of nanometer polysilicon material is researched. The experimental results show that, by using nanometer pretreatment afer pre-alkalization and pre-aeidification, the depressed pressure and augmented injection effect is most effectual.The ratio of final permeability after pretreatment to initial permeability（KJK0）,can attain the number of 6.07; the pretreatment technology has been used in 5 wells, the result is favourable, the range ot average mon-well pressure decreasing can get to 9.7 MPa, the amount of average mon-well injection increasing is 3 819 m3,the average period of validity is more than 7 month. on this basis, the technology of Decreasing Pressure and Increasing Injection of nanometer polysilicon material is optimized ,the optimized technology is applied to field practice ,and its effect is evaluated.