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Study on Variation Laws of Fluid Threshold Pressure Gradient in Low Permeable Reservoir

Author

Listed:
  • Mingwei Zhao

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Mengjiao Cao

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Haonan He

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Caili Dai

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

A study on the seepage characteristics and laws of nano-micron pore throat in a low permeable reservoir matrix is of great significance for promoting high efficacy of low permeable reservoirs. Threshold pressure gradient (TPG) is an essential factor to reflect the seepage law. Here, variation laws of TPG and its influencing factors of low reservoir fluid are analyzed systematically through physical simulation experiment. Throat diameter distribution of cores was measured by a mercury injection method, and it was found that with the decrease of pore throat median diameter, TPG increase appeared slowly first and fast afterwards. The patterns of the TPG with permeability in water and oil were compared. Results showed that the TPG versus permeability gave power functions in a form and the TPG in oil was more than two times larger than that of water. Besides, TPG in two-phase flow was investigated by the stabilization method. Tests revealed that the higher the oil saturation, the greater the TPG value, and the TPG in two-phase flow is always higher than that of single-phase flow under the same conditions, which function as the combined action of the capillary force. In addition, the effects of core length, fluid type, and core wettability on the TPG were studied systematically, which has guiding significance for the development of a low permeability reservoir.

Suggested Citation

  • Mingwei Zhao & Mengjiao Cao & Haonan He & Caili Dai, 2020. "Study on Variation Laws of Fluid Threshold Pressure Gradient in Low Permeable Reservoir," Energies, MDPI, vol. 13(14), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3704-:d:386377
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    References listed on IDEAS

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    1. Liu, Weiguo & Wu, Zhaoran & Li, Jiajie & Zheng, Jianan & Li, Yanghui, 2020. "The seepage characteristics of methane hydrate-bearing clayey sediments under various pressure gradients," Energy, Elsevier, vol. 191(C).
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    Cited by:

    1. Tongjing Liu & Liwu Jiang & Jinju Liu & Juan Ni & Xinju Liu & Pengxiang Diwu, 2022. "A Novel Workflow for Early Time Transient Pressure Data Interpretation in Tight Oil Reservoirs with Physical Constraints," Energies, MDPI, vol. 16(1), pages 1-15, December.

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