石油学报 ›› 2017, Vol. 38 ›› Issue (9): 1066-1072.DOI: 10.7623/syxb201709008

• 油田开发 • 上一篇    下一篇

酯类化合物降低原油与二氧化碳体系最小混相压力实验

赵跃军1,2, 宋考平1,2, 范广娟3, 皮彦夫1,2, 刘丽1   

  1. 1. 东北石油大学石油工程学院 黑龙江大庆 163318;
    2. 东北石油大学提高油气采收率教育部重点实验室 黑龙江大庆 163318;
    3. 东北石油大学地球科学学院 黑龙江大庆 163318
  • 收稿日期:2016-10-18 修回日期:2017-06-02 出版日期:2017-09-25 发布日期:2017-10-09
  • 通讯作者: 赵跃军,男,1980年9月生,2003年获大庆石油学院学士学位,2009年获大庆石油学院硕士学位,现为东北石油大学石油工程学院讲师,主要从事二氧化碳混相驱、降低二氧化碳混相驱最小混相压力、油藏数值模拟等提高原油采收率理论与技术的工作和研究。Email:fancyzyj@163.com
  • 作者简介:赵跃军,男,1980年9月生,2003年获大庆石油学院学士学位,2009年获大庆石油学院硕士学位,现为东北石油大学石油工程学院讲师,主要从事二氧化碳混相驱、降低二氧化碳混相驱最小混相压力、油藏数值模拟等提高原油采收率理论与技术的工作和研究。Email:fancyzyj@163.com
  • 基金资助:

    国家重大科技专项(2011ZX05009,2011ZX05052)和国家自然科学基金项目(No.51404070)资助。

The experiment for reducing the minimum miscible pressure of crude oil and carbon dioxide system with ester compounds

Zhao Yuejun1,2, Song Kaoping1,2, Fan Guangjuan3, Pi Yanfu1,2, Liu Li1   

  1. 1. College of Petroleum Engineering, Northeast Petroleum University, Heilongjiang Daqing 163318, China;
    2. Key Laboratory for Enhanced Oil and Gas Recovery of the Ministry of Education, Northeast Petroleum University, Heilongjiang Daqing 163318, China;
    3. College of Geosciences, Northeast Petroleum University, Heilongjiang Daqing 163318, China
  • Received:2016-10-18 Revised:2017-06-02 Online:2017-09-25 Published:2017-10-09

摘要:

针对试验区近井地带达到混相驱、远井地带尚未达到混相驱的问题,通过注入油溶性表面活性剂(柠檬酸异丁酯或柠檬酸异戊酯)来降低原油与二氧化碳体系的最小混相压力,该表面活性剂既能够溶于原油中降低原油黏度,又能够溶解在超临界二氧化碳中降低原油与二氧化碳之间的界面张力,从而降低原油与二氧化碳之间的最小混相压力。采用长细管驱替实验的方法,测定了2种油溶性表面活性剂对试验区原油与二氧化碳体系的最小混相压力的影响。实验表明,注入的油溶性表面活性剂能够明显降低试验区原油与二氧化碳体系的最小混相压力,2种表面活性剂降低的最小混相压力值分别为7.2 MPa和6.6 MPa,并且随着表面活性剂注入段塞的增大,测得的原油与二氧化碳体系的最小混相压力逐渐降低,但是降低幅度越来越小,结合表面活性剂制备价格,得到最经济的表面活性剂注入段塞量为0.003 PV,并建议选择柠檬酸异丁酯作为试验区降低最小混相压力的化学试剂。

关键词: 最小混相压力, 超临界二氧化碳, 混相驱, 长细管驱替实验, 提高原油采收率

Abstract:

In the test area, miscible flooding was achieved in the near-wellbore area rather than the far-wellbore area. Aiming at this problem, the oil soluble surfactant (citric acid isobutyl ester or citric acid isopentyl ester) was injected to reduce the minimum miscible pressure of crude oil and carbon dioxide system. This surfactant can not only dissolve in crude oil to reduce the viscosity of crude oil, but also dissolve in supercritical carbon dioxide to reduce the interfacial tension between crude oil and carbon dioxide, thereby reducing the minimum miscible pressure between crude oil and carbon dioxide. The long-slim-tube displacement experiment method was used to measure the influence of two different oil soluble surfactants on the minimum miscible pressure (MMP) of crude oil and carbon dioxide system in the test area. The results showed that the injected oil soluble surfactant was able to obviously reduce the minimum miscible pressure of crude oil and carbon dioxide system, and the MMP reduced by two oil soluble surfactants were 7.2 MPa and 6.6 MPa respectively. Moreover, the measured MMP was reduced gradually with constantly increasing the injected slug of surfactant, but the reduction range became smaller and smaller. The most economical injected slug of surfactant was 0.003 PV by evaluating the cost for surfactant preparation. It was suggested that the citric acid isobutyl ester should be chosen as the chemical reagent to reduce the MMP in the test area.

Key words: minimum miscible pressure, supercritical carbon dioxide, miscible flooding, long-slim-tube displacement experiment, enhanced oil recovery

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