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日用化学工业（中英文）

日用化学工业（中英文） ›› 2022, Vol. 52 ›› Issue (11): 1147-1154.doi: 10.3969/j.issn.1001-1803.2022.11.001

• 基础研究 •    下一篇

低渗透油藏缓释型表面活性剂纳米载体研究

康万利1,2,*(),王康辉1,2,李哲1,2,吕伟3,4,杨红斌1,2,贾茹雪1,2,何瑛琦1,2   

  1. 1.非常规油气开发教育部重点实验室（中国石油大学（华东）），山东 青岛 266580
    2.中国石油大学（华东） 石油工程学院，山东 青岛 266580
    3.中国石油长庆油田分公司油气工艺研究院，陕西 西安 710018
    4.低渗透油气田勘探开发国家工程实验室，陕西 西安 710018
  • 收稿日期:2022-03-11 修回日期:2022-06-05 出版日期:2022-11-22 发布日期:2022-11-22
  • 通讯作者: 康万利
  • 基金资助:
    国家自然科学基金重点项目(52130401);山东省自然科学基金(ZR2021ME171);博士后创新人才支持计划(BX20200386)

Study on slow-release surfactant nanocarriers in low-permeability reservoirs

Kang Wanli1,2,*(),Wang Kanghui1,2,Li Zhe1,2,Lv Wei3,4,Yang Hongbin1,2,Jia Ruxue1,2,He Yingqi1,2   

  1. 1. Key Laboratory of Unconventional Oil & Gas Development （China University of Petroleum （East China））, Ministry of Education, Qingdao, Shandong 266580, China
    2. School of Petroleum Engineering, China University of Petroleum （East China）, Qingdao, Shandong 266580, China
    3. Oil and Gas Technology Research Institute, Petrochina Changqing Oilfield Company, Xi’an, Shaanxi 710018, China
    4. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi’an, Shaanxi 710018, China
  • Received:2022-03-11 Revised:2022-06-05 Online:2022-11-22 Published:2022-11-22
  • Contact: Wanli Kang

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摘要：

为解决低渗透油藏表面活性剂驱吸附严重的问题，以蜂蜡、TX-10和去离子水分别为油相、表面活性剂和水相，采用超声乳化法在高于蜂蜡熔点温度（61 ℃）下制备纳米乳液，进一步降低温度将TX-10固定在油相内部，得到一种缓释型表面活性剂纳米载体。借助紫外可见分光光度计、粒度分析仪、界面张力仪、接触角测量仪等测定了纳米载体的包裹率以及驱油有关性能。结果表明，随着TX-10质量浓度的增加，纳米载体的平均粒径先减小后增加，在5 000 mg/L时粒径最小约105 nm，且对TX-10的包裹率约为90%；在地层温度（65 ℃）下，纳米载体可降低模拟油/水界面张力至3.24×10-2 mN/m，降低表面张力至23.3 mN/m，优于TX-10溶液，并在降低界面张力过程中表现出缓释性；此外，纳米载体可使亲油岩心表面发生润湿反转，与TX-10溶液性能相似，静吸附损失率小于0.1%，较TX-10溶液降低10倍以上；在30和65 ℃下，纳米载体的洗油效率分别是87.7%和92.3%，较TX-10溶液提高约4%。本研究制备的纳米载体可携带表面活性剂在地层孔隙中运移，与原油接触缓慢释放表面活性剂，在保证表面活性剂自身性能的同时具备抗吸附能力，对于低渗透油藏提高采收率表现出较好的应用前景。

关键词: 低渗透油藏, 提高采收率, 表面活性剂, 纳米载体, 缓释性

Abstract:

To solve the serious adsorption problem of surfactant flooding in low-permeability reservoir, beeswax, TX-10 and deionized water were used as oil phase, surfactant and water phase to prepare nanoemulsions. The ultrasonic emulsification method at a temperature above the melting point of beeswax （61 ℃） was applied, and then the temperature was reduced to fix TX-10 inside the oil phase, and thus a slow-release surfactant nanocarrier was obtained. By means of UV-vis spectrophotometer, particle size analyzer, interfacial tensiometer and contact angle analyzer, the encapsulation rate and oil displacement properties of nanocarriers were measured. The results showed that, with the increase of TX-10 mass concentration, the average particle size of the nanocarriers was decreased first and then increased, and the minimum particle size was approximately 105 nm when the concentration was 5 000 mg/L, and the encapsulation rate for TX-10 was approximately 90%. At the formation temperature （65 ℃）, the nanocarriers could reduce the interfacial tension between simulated oil and water to 3.24×10-2 mN/m and the surface tension to 23.3 mN/m, which was better than the TX-10 solution alone. Moreover, the nanocarriers behaved slow-release in the process of reducing interfacial tension. In addition, the nanocarriers could reverse the wettability of the surface of oleophilic core, which was similar to TX-10 solution. The static adsorption loss rate was less than 0.1%, which was more than ten times lower than that of TX-10 solution. At 30 and 65 ℃, the oil washing efficiency of the nanocarriers was 87.7% and 92.3%, respectively, which was 4% higher than that of TX-10 solution. The nanocarriers prepared in this study can carry surfactants to migrate in formation pores and release surfactants slowly when in contact with crude oil. The nanocarriers have anti-adsorption ability while ensuring the performance of surfactants, showing a good application prospect for enhanced oil recovery in low-permeability reservoirs.

Key words: low permeability reservoir, enhanced oil recovery, surfactant, nanocarrier, slow-release

中图分类号: 

  • TQ423