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The dynamic convection-diffusion effect of CO_2 Huff-n-Puff on Pre-Darcy flow behavior

机译：Co_2 Huff-n-Puff对达西前流动行为的动态对流扩散效应

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摘要

Many reports have presented that in tight matrix, oil phase obeys Pre-Darcy flow. However, for the CO2 Huff-n-Puff development, it is an outstanding challenge to understand the changing oil properties could influence the nonlinear degree in the Pre-Darcy percolation process. As the dynamic Pre-Darcy flow model has been presented for describing the nonlinear degree variation, the dynamic convection-diffusion effect of the injected gas on the percolation behavior has become a key issue. In this paper, based on the fluid-rock experiments of the studied area, the near miscible system of CO2-injected mixtures in nanopores is firstly investigated. Then, the dynamic Pre-Darcy flow numerical simulation is launched for gas diffusion coefficient evaluation, convection-diffusion effect on Pre-Darcy flow behavior and field development program optimization. The results indicate that considering the dynamic change of the nonlinear degree in CO2 injection process, the diffusion coefficient for the studied area is set as 0.00093 cm(2)/s by fitting the experiment and field data. Additionally, based on the detailed discussion on the DDPC, pore pressure, and oil saturation, it could be seen the simulation prediction accuracy will reduce without linking this gas convection-diffusion effect. Finally, for maximizing the field oil recovery in two Huff-Puff cycles, the optimal re-opened time with this effect is when the near-well pressure drops to 14.7 MPa. This investigation could provide further insight into the gas enhanced oil recovery of the Pre-Darcy flow.
机译：许多报告介绍，在紧密的矩阵中，石油相位友达达西流动。然而，对于CO2 Huff-N-Puff的发展，了解改变的油性能可能影响达西达西公鸡前渗透过程的非线性程度是一个突出的挑战。由于已经提出了用于描述非线性度变化的动态预流体模型，所注入的气体对渗滤行为的动态对流扩散效应已成为一个关键问题。本文基于研究区域的流体岩实验，首先研究了纳米孔中的CO2注射混合物的近可混溶系统。然后，启动动态前达西循环流量数值模拟，用于气体扩散系数评估，对对流扩散效应对达西达西顺的行为和现场开发计划优化。结果表明，考虑到二氧化碳喷射过程中非线性度的动态变化，通过拟合实验和现场数据，将研究区域的扩散系数设定为0.00093cm（2）/ s。另外，基于对DDPC，孔隙压力和油饱和度的详细讨论，可以看出模拟预测精度，而不会使这种气体对流扩散效果连接。最后，为了最大化两种发动机泡沫循环中的现场油回收，这种效果的最佳再开启时间是当近孔压降降至14.7MPa时。该调查可以进一步了解气体增强的达西流量的储存。

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  • 来源
    《Fuel》 |2020年第15期|117500.1-117500.15|共15页
  • 作者

    Wang Qiong; Jiang Ruizhong; Cui Yongzheng; Zhang Chunguang; Liu Gewei;

  • 作者单位

    China Univ Petr East China Qingdao Peoples R China;

    China Univ Petr East China Qingdao Peoples R China;

    China Univ Petr East China Qingdao Peoples R China;

    China Univ Petr East China Qingdao Peoples R China|CNOOC Ltd Shanghai Branch Shanghai Peoples R China;

    EnerTech Drilling & Prod Co CNOOC Tianjin Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pre-Darcy flow; CO2 injection; Unconventional oil reservoir;

    机译：预达西流动;二氧化碳注射;非传统的储油水库;

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