适合特低渗透储层的纳米泡沫驱油体系研究  

Study of nano-foam oil drive system suitable for ultra-low permeability reservoirs

作　　者：王贵文 张雁 齐怀彦 王亚军 王艳平 WANG Gui-wen;ZHANG Yan;QI Huai-yan;WANG Ya-jun;WANG Yan-ping(The Third Oil Production Plant of Changqing Oilfield Company,PetroChina,Yinchuan 750000,China;Beijing Huacheng Hengye Petroleum Technology Development Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]中国石油长庆油田分公司第三采油厂,宁夏银川750000 [2]北京华成恒业石油技术开发有限公司,河南郑州450000

出　　处：《化学工程师》2023年第11期53-57,113,共6页Chemical Engineer

基　　金：中石油重大开发实验项目(XJYT-2020-FW-51857)。

摘　　要：为提高低渗油藏的采收率,本文使用聚乙二醇修饰的SiO_(2)纳米颗粒作为添加剂来提高泡沫稳定性,采用溶胶凝胶法合成了4种不同表面修饰量的SiO_(2)纳米颗粒(即聚乙二醇膜),并对纳米颗粒进行了表征,对零电荷点和化学组成等性质进行了测试分析。通过表面活性剂溶液和纳米颗粒的混合得到纳米流体。纳米颗粒在与表面活性剂协同作用下,对气泡的结构强化,以增加其半衰期和耐久性。当表面活性剂浓度高于CMC时,泡沫稳定性达到最大值。纳米流体中纳米颗粒浓度越低,聚合粒径越小。聚乙二醇的用量可以阻止或促进纳米颗粒的聚集,粒径越小,泡沫的稳定性越好。使用α-烯烃磺酸盐表面活性剂和修饰的纳米颗粒生成的泡沫比仅使用表面活性剂的泡沫更稳定。In order to improve the recovery of low permeability reservoirs,in this paper,polyethylene glycol modified silica nanoparticles were used as additives to improve the foam stability,four different surface modification amounts of silica nanoparticles(i.e.,polyethylene glycol films)were synthesized by sol-gel method,and the nanoparticles were characterized,and properties such as zero charge point and chemical composition were characterized.Nanofluids were obtained by mixing surfactant solution and nanoparticles.The nanoparticles,in synergy with the surfactant,structurally strengthened the bubbles to increase their half-life and durability.The bubble stability reaches a maximum when the surfactant concentration was higher than the CMC.The lower the nanoparticle concentration in the nanofluid,the smaller the polymerization particle size.The amount of polyethylene glycol can prevent or promote the aggregation of nanoparticles,and the smaller the particle size,the better the stability of the foam.Foams generated with α-olefin sulfonate surfactants and modified nanoparticles are more stable than those with surfactants only.

关 键 词：泡沫 纳米颗粒 提高采收率 表面活性剂 特低渗透储层 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]