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首页> 外文期刊>Energy & fuels >Experimental and Numerical Study on CO_2 Sweep Volume during CO_2 Huff-n-Puff Enhanced Oil Recovery Process in Shale Oil Reservoirs
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Experimental and Numerical Study on CO_2 Sweep Volume during CO_2 Huff-n-Puff Enhanced Oil Recovery Process in Shale Oil Reservoirs

机译：页岩油藏CO_2 Huff-n-Puff强化采油过程中CO_2吹扫量的实验与数值研究

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摘要

CO2 huff-n-puff has been proven to be the most effective enhanced oil recovery (EOR) method in shale oil reservoirs. The injected CO2 will replenish reservoir energy and penetrate the reservoir matrix to extract oil. However, the CO2 sweep volume during the huff-n-puff process has not been accurately evaluated by existing studies. In this paper, the CO2 sweep volume was investigated through experimental and numerical simulation methods. In the experimental study, the CO2 sweep areas were depicted by X-ray computed tomography scan technology. The results indicated that the ratio of the CO2 sweep area was 78.63% in the seventh huff-n-puff cycle, leading to a total oil recovery of 56.80%. The numerical simulation considered the mechanisms of molecular diffusion and nanopore confinement. The results showed that in the first huff-n-puff cycle, the gas sweep volume percentage was 9.47% after 100 days of huff period. In the gas swept volume, oil viscosity was reduced by 25.9% to 68.2%. After three cycles of CO2 injection, the oil recovery manifested a 1.5% increase compared to the case without huff-n puff. The contributions of different parameters on gas sweep volume and cumulative oil recovery were investigated. The results illustrated that the nanopore confinement effect and molecular diffusion had significant impacts on the gas sweep volume and cumulative oil recovery. Higher injection pressure, longer huff time, and more huff-n-puff cycles lead to larger gas sweep volume, as well as cumulative oil recovery. A suitable primary depletion period and a huff-n-puff schedule should be determined based on the requirements of field production. The investigations in this study provide insights into better understanding of the EOR mechanisms and optimizing the design of CO2 huff-n-puff operations in shale oil reservoirs.
机译：事实证明，CO2吞吐法是页岩油藏中最有效的提高采收率（EOR）的方法。注入的二氧化碳将补充储层能量并渗透到储层基质中以提取石油。但是，现有研究尚未准确评估哈夫－纳夫－帕夫过程中的二氧化碳吹扫量。本文通过实验和数值模拟方法研究了CO2吹扫量。在实验研究中，通过X射线计算机断层扫描技术描绘了CO2吹扫区域。结果表明，在第7次吞吐n抽吸过程中，CO2吹扫面积的比率为78.63％，导致总采油量为56.80％。数值模拟考虑了分子扩散和纳米孔限制的机制。结果表明，在第一个huff-n-puff循环中，经过100天的哈夫期后，气体吹扫体积百分比为9.47％。在扫气量中，油的粘度降低了25.9％至68.2％。在注入二氧化碳的三个循环后，与未进行huff-n抽吸的情况相比，采油量显示增加了1.5％。研究了不同参数对扫气量和累计采油量的贡献。结果表明，纳米孔的封闭效应和分子扩散对气扫量和累积油采收率有显着影响。较高的注射压力，较长的吹气时间和更多的吹气-n-吹气循环会导致更大的气体吹扫量以及累积的油采收率。应根据田间生产的要求来确定合适的主要消耗时间和吞吐时间。本研究中的调查为更好地理解EOR机制和优化页岩油藏CO2吞吐—n吹作业的设计提供了见识。

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  • 来源
    《Energy & fuels》 |2019年第5期|4017-4032|共16页
  • 作者

    Li Lei; Su Yuliang; Sheng James J.; Hao Yongmao; Wang Wendong; Lv Yuting; Zhao Qingmin; Wang Haitao;

  • 作者单位

    China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Minist Educ, Qingdao 266580, Shandong, Peoples R China|China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Shandong, Peoples R China;

    China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Minist Educ, Qingdao 266580, Shandong, Peoples R China|China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Shandong, Peoples R China;

    Texas Tech Univ, Dept Petr Engn, Lubbock, TX 79401 USA;

    China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Shandong, Peoples R China;

    China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Shandong, Peoples R China;

    Shandong Univ Sci & Technol, Coll Mech & Elect Engn, Qingdao 266590, Shandong, Peoples R China;

    Sinopec Explorat & Prod Res Inst, Beijing 100083, Peoples R China;

    Sinopec Explorat & Prod Res Inst, Beijing 100083, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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