氧化石墨烯纳米粒子提高乳化酸性能实验研究

Experimental study on improving the performance of emulsified acid by using graphene oxide(GO)nanoparticles

为了提高乳化酸在中高温油藏的深部酸化效果,将酸性条件下能够稳定存在的氧化石墨烯纳米粒子与表面活性剂复配使用。通过二者的协同效应提高界面膜的稳定性,从而提高乳化酸的稳定性和酸化选择能力。所开发的纳米乳化酸的配比为:0.8%氧化石墨烯纳米粒子+24%HCl+29%0#柴油+0.4%Span80+0.1%烷基胺+0.3%缓蚀剂+0.2%铁离子稳定剂+水。对比不含纳米粒子的乳化酸,该纳米乳化酸在地层中的酸岩反应要滞后120 min左右、对酸岩反应的缓速能力更强、酸化选择性能强,经含氧化石墨烯纳米粒子乳化酸冲刷后的岩石表面已成油湿。实验表明氧化石墨烯纳米材料可较好地用于乳化酸体系,为乳化酸产品的开发提供重要支撑。

In order to improve the application effect of the emulsified acid in the high-medium temperature oil reservoirs,the acid-resisting graphene oxide(GO)nanoparticles and surfactant are used in combination to solve the problem.The stability of the interface film is improved by the synergistic effect of the two,thereby improving the stability of the emulsified acid.The composition of the developed nano emulsified acid is:0.8%GO nanoparticles+24%HCl+29%0#diesel+0.4%Span80+0.1%alkylamine+0.3%corrosion inhibitor+0.2%ferric ion stabilizer+water.Compared with the emulsified acid without nanoparticles,the nano-emulsified acid in the stratum can be delayed about 120 min.Besides,the nano-emulsified acid has a slower acid reaction to the rock and its selection performance of acidification is stronger.The surface of the rock washed by the emulsified acid containing GO nanoparticles has become oily.Experiments show that GO nanomaterials can be used in emulsified acid systems,which can provide an important support for the development of emulsified acid products.