高分散稳定性二硫化钼纳米片驱油体系及性能  

Construction and Performance of MoS_(2) Nanoflooding System with High Dispersion Stability

作　　者：高彦博 樊辉[1] 王芳[1] 周娟[1] 王筱晔 董宪鹏 逯力成 GAO Yanbo;FAN Hui;WANG Fang;ZHOU Juan;WANG Xiaoye;DONG Xianpeng;LU Licheng(The Fifth Oil Production Plant,Changqing Oilfield Company,PetroChina,Xi’an,Shaanxi 710018,P R of China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,P R of China)

机构地区：[1]中国石油长庆油田分公司第五采油厂,陕西西安710018 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《油田化学》2024年第4期656-663,共8页Oilfield Chemistry

基　　金：中国石油天然气股份有限公司长庆油田分公司第五采油厂项目“姬塬油田耿60长4+5油藏超低渗透油藏渗流机理研究”(项目编号HX20220482)。

摘　　要：在高盐低渗透油藏环境下,二硫化钼(MoS_(2))纳米片的分散稳定性差,往往需要和表面活性剂复配发挥协同作用以提高其性能,因此明确MoS_(2)与表面活性剂之间的相互作用对提高MoS_(2)的应用范围具有十分重要的意义。通过水热法,以硫代乙酰胺为硫源、三氧化钼为钼源合成了MoS_(2)纳米片。研究了5种表面活性剂对MoS_(2)纳米片在盐水中分散稳定性的影响,优选出阳离子表面活性剂十六烷基三甲基溴化铵(CTAB),考察了纳米驱油体系CTAB-MoS_(2)(质量比为10∶1)的界面性能、乳化性能和提高采收率效果。结果表明,MoS_(2)纳米片具有片层结构,在去离子水中的分散稳定性较好;随NaCl质量浓度的增加,分散稳定性降低;CTAB可显著提高MoS_(2)纳米片在3000 mg/L NaCl溶液中的分散稳定性。当MoS_(2)质量分数为0.1%时,CTAB的加入可使MoS_(2)的自稳定时间由不足3 h增长为12 h;当MoS_(2)质量分数为0.005%时,CTAB的加入可使MoS_(2)的平均粒径由122.7 nm降为98.1 nm,Zeta电位绝对值由25.0 mV变为33.8 mV。0.05%CTAB-0.005%MoS_(2)能在正庚烷/水界面处自发形成强度较高的界面膜和攀附膜,并可将正庚烷/水界面张力降低至0.175 mN/m,同时还具有较好的乳化效果。基于其优异的耐盐性以及良好的界面活性,CTAB-MoS_(2)在低渗透环境下具有一定的提高采收率效果。在60℃、3000 mg/L NaCl的条件下,向低渗透(48.33×10^(-3)μm^(2))岩心注入0.5 PV 0.05%CTAB-0.005%MoS_(2),可提高采收率9.85百分点。高分散稳定性CTAB-MoS_(2)的构建有望为低渗透油田的高效开发提供解决方案,同时对于提高纳米材料的分散稳定性提供研究思路。In the environment of high salt and low permeability reservoir,the dispersion stability of molybdenum disulfide(MoS_(2))nanosheet is poor,so it is often necessary to play a synergistic effect with surfactant to improve its performance.It is very important to clarify the interaction between MoS_(2)and surfactant to improve the application range of MoS_(2).By hydrothermal method,MoS_(2)nanosheets were synthesized with thioacetamide as sulfur source and molybdenum trioxide as molybdenum source.The effects of five surfactants on the dispersion stability of MoS_(2)nanosheets in saline was studied,and then the cationic surfactant hexadecyltrimethyl ammonium bromide(CTAB)was selected.The interfacial performance,emulsification properties and oil recovery effect of CTAB-MoS_(2)(mass ratio of 10∶1)were investigated.The results showed that MoS_(2)nanosheet had layered structure,meanwhile the dispersion stability in deionized water was good.However,the dispersion stability decreased with increasing NaCl mass concentration.CTAB could significantly improve the dispersion stability of MoS_(2)nanosheets in 3000 mg/L NaCl solution.When the mass fraction of MoS_(2)was 0.1%,the addition of CTAB could increase the stabilization time of MoS_(2)from less than 3 h to 12 h.When the mass fraction of MoS_(2)was 0.005%,CTAB could reduce the average particle size of MoS_(2)from 122.7 nm to 98.1 nm,meanwhile the absolute Zeta potential value increased from 25.0 mV to 33.8 mV.0.05%CTAB-0.005%MoS_(2)could spontaneously form a strong interface membrane and climbing membrane at the n-heptane/water interface.Furthermore,it could not only reduce the interface tension between n-heptane and water to 0.175 mN/m,but also have a good emulsifying effect.Based on its excellent salt tolerance and good interface activity,CTAB-MoS_(2)had certain enhanced oil recovery effect in low permeability environment.Under the condition of 60℃and 3000 mg/L NaCl solution,when 0.5 PV 0.05%CTAB-0.005%MoS_(2)was injected into a low permeability(48.33×10^(-3)μm^(2))co

关 键 词：二硫化钼 纳米片 表面活性剂 分散稳定性 提高采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]