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Investigation on the Application of NMR to Spontaneous Imbibition Recovery of Tight Sandstones: An Experimental Study

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  • Chaohui Lyu

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)

  • Qing Wang

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)

  • Zhengfu Ning

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)

  • Mingqiang Chen

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)

  • Mingqi Li

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)

  • Zhili Chen

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)

  • Yuxuan Xia

    (State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China
    Hubei Subsurface Multi-Scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China)

Abstract

In this paper, the nuclear magnetic resonance (NMR) technique is applied to exploring the spontaneous imbibition mechanism in tight sandstones under all face open (AFO) boundary conditions, which will benefit a better understanding of spontaneous imbibition during the development of oil & gas in tight formations. The advantages of nuclear magnetic resonance imaging (NMRI) and NMR T 2 are used to define the distribution of remaining oil, evaluate the effect of micro structures on imbibition and predict imbibition recovery. NMR T 2 results show that pore size distributions around two peaks are not only the main oil distributions under saturated condition but also fall within the main imbibition distributions range. Spontaneous imbibition mainly occurs in the first 6 h and then slows down and even ceases. The oil signals in tiny pores stabilize during the early stage of imbibition while the oil signal in large pores keeps fluctuating during the late stage of imbibition. NMRI results demonstrate that spontaneous imbibition is a replacement process starting slowly from the boundaries to the center under AFO and ending with oil-water mixing. Furthermore, the wetting phase can invade the whole core in the first 6 h, which is identical with the main period of imbibition occurring according to NMR T 2 results. Factors influencing the history of oil distribution and saturation differ at different periods, while it is dominated by capillary imbibition at the early stage and allocated by diffusion at later time. Two imbibition recovery curves calculated by NMRI and NMR T 2 are basically consistent, while there still exists some deviations between them as a result of the resolutions of NMRI and NMR T 2 . In addition, the heterogeneity of pore size distributions in the two samples aggravates this discrepancy. The work in this paper should prove of great help to better understand the process of the spontaneous imbibition, not only at the macroscopic level but also at the microscopic level, which is significant for oil/gas recovery in tight formations.

Suggested Citation

  • Chaohui Lyu & Qing Wang & Zhengfu Ning & Mingqiang Chen & Mingqi Li & Zhili Chen & Yuxuan Xia, 2018. "Investigation on the Application of NMR to Spontaneous Imbibition Recovery of Tight Sandstones: An Experimental Study," Energies, MDPI, vol. 11(9), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2359-:d:168253
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    References listed on IDEAS

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    1. Mingqiang Chen & Linsong Cheng & Renyi Cao & Chaohui Lyu, 2018. "A Study to Investigate Fluid-Solid Interaction Effects on Fluid Flow in Micro Scales," Energies, MDPI, vol. 11(9), pages 1-20, August.
    2. Ting Chen & Zhengming Yang & Yunhong Ding & Yutian Luo & Dan Qi & Wei Lin & Xinli Zhao, 2018. "Waterflooding Huff-n-puff in Tight Oil Cores Using Online Nuclear Magnetic Resonance," Energies, MDPI, vol. 11(6), pages 1-14, June.
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    Cited by:

    1. Zhenkai Wu & Xizhe Li & Hanmin Xiao & Xuewei Liu & Wei Lin & Yuan Rao & Yang Li & Jie Zhang, 2021. "The Establishment and Evaluation Method of Artificial Microcracks in Rocks," Energies, MDPI, vol. 14(10), pages 1-12, May.
    2. Ting Chen & Zhengming Yang & Yutian Luo & Wei Lin & Jiaxiang Xu & Yunhong Ding & Jialiang Niu, 2018. "Evaluation of Displacement Effects of Different Injection Media in Tight Oil Sandstone by Online Nuclear Magnetic Resonance," Energies, MDPI, vol. 11(10), pages 1-16, October.
    3. Jianchao Cai & Zhien Zhang & Qinjun Kang & Harpreet Singh, 2019. "Recent Advances in Flow and Transport Properties of Unconventional Reservoirs," Energies, MDPI, vol. 12(10), pages 1-5, May.
    4. Tao Li & Ying Wang & Min Li & Jiahao Ji & Lin Chang & Zheming Wang, 2019. "Study on the Impacts of Capillary Number and Initial Water Saturation on the Residual Gas Distribution by NMR," Energies, MDPI, vol. 12(14), pages 1-15, July.

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