高分散稳定性的MoS2纳米片驱油体系及性能
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1.中国石油长庆油田分公司第五采油厂;2.中国石油大学北京

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TE39 DOI

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姬塬油田耿60长4+5油藏超低渗透油藏渗流机理研究


Construction and performance of MoS2 nanoflooding system with high dispersion stability
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    摘要:

    针对国内低渗透油藏占比越来越大,常规驱油剂不能满足增产要求的矛盾,纳米驱油材料由于其注入性好、成本较低、提高采收率效果明显等优点而被应用于低渗透油藏开采,其中MoS2纳米片因其简便的制备方法和低成本受到越来越多的关注。但纳米材料因其表面效应在低渗透油藏中分散稳定性差,往往需要和表面活性剂复配发挥协同作用以提高其性能,明确MoS2与表面活性剂之间的相互作用对提高MoS2的应用范围具有十分重要的意义。本文通过水热法,以硫代乙酰胺为硫源,三氧化钼为钼源合成了MoS2纳米片。研究了不同表面活性剂对MoS2纳米片在盐水分散稳定性的影响,并构建了一种新型纳米驱油体系CTAB-MoS2最后考察了CTAB-MoS2的界面性能和提高采收率性能。实验结果表明,CTAB的引入显著提高了MoS2纳米片在3000mg/L的NaCl溶液中的分散稳定性,0.1wt.%的CTAB-MoS2自稳定时间由原来的不足3h增长为12h,CTAB-MoS2相比MoS2在水中平均粒径由原来122.7nm降为98.1nm,Zeta电位绝对值由25mV变为33.8mV。CTAB-MoS2能在正庚烷/水界面处自发形成界面膜和攀附膜,并可将正庚烷/水界面张力降低至0.175 mN/m,同时还具有良好的乳化效果。基于其优异的耐盐性以及良好的界面活性,CTAB-MoS2在低渗环境具有一定的提高采收率效果。在60℃、NaCl浓度为3000mg/L的条件下,对50mD的低渗岩芯仅注入0.5PV浓度为0.005wt.%的CTAB-MoS2提高采收率约9.85%。高分散稳定性CTAB-MoS2的构建有望为低渗油田的高效开发提供解决方案,同时对于提高纳米材料分散稳定性提供研究思路。

    Abstract:

    For domestic low permeability reservoir accounted for more and more large, conventional flooding agent cannot meet the requirements of production, nano flooding material because of its good injection, small reservoir damage, improve the oil recovery effect is obvious and is applied to low permeability reservoir mining, the MoS2 nanoscale because of its simple preparation method and low cost by more and more attention. However, due to the poor dispersion stability of nanomaterials in low permeability reservoirs, they often need to play a synergistic role with surfactant to improve their performance. It is of very important significance to clarify the interaction between MoS2 and surfactant to improve the application range of MoS2. Here, MoS2 nanosheets were synthesized by hydrothermal method, using thioacetamide as sulfur source and molybdenum trioxide as molybdenum source. The effects of different surfactants on the dispersion stability of MoS2 nanosheets in saline was studied, and a new nanoscale oil-driven system CTAB-MoS2, and finally, the interfacial performance and enhanced recovery performance of CTAB-MoS2 was constructed. The experimental results showed that the introduction of CTAB significantly improved the dispersion stability of MoS2 nanosheets in 3000 mg/L NaCl solution, the self-stabilization time of 0.1wt.% CTAB-MoS2 increased from less than 3h to 12h, the average particle size of CTAB-MoS2 decreased from 122.7nm to 98.1nm compared with MoS2, and the absolute value of Zeta potential changed from 25 mV to 33.8mV. CTAB-MoS2 can spontaneously form interface membrane and climbing membrane at the n-heptane/water interface, and can reduce the tension of n-heptane / water interface to 0.175 mN/m, and also has good emulsifying effect. Based on its excellent salt tolerance and good interface activity, CTAB-MoS2 has some enhanced oil recovery effect in the hypotonic environment. Only 0.5PV concentration of 0.005wt.% was injected at 60℃ and NaCl concentration of 3000 mg/L. The construction of CTAB-MoS2 is expected to provide a solution for the efficient development of low permeability fields and a research idea for improving the dispersion stability of nanomaterials.

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  • 收稿日期: 2024-04-09
  • 最后修改日期: 2024-05-11
  • 录用日期: 2024-06-03
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