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New insights and discussions on stress sensitivity of fractured tight reservoir

Zhang Rui1,2，Ning Zheng-fu1,2，Zhang Hai-shan3，Xie Qian1,4   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting，China University of Petroleum,Beijing 102249,China；
    2.Key Laboratory of Petroleum Engineering of the Ministry of Education，China University of Petroleum，Beijing 102249;
    3.No.1 Oil Production Plant,Dagang Oilfield Company,PetroChina,Tianjin 300280,China;
    4.CNPC Key Laboratory of Geophysical Exploration,China University of Petroleum,Beijing 102249,China
  • Received:2015-09-10 Revised:2015-10-28 Online:2016-05-10 Published:2016-05-10

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Abstract: The current insights in the applicability of stress dependent permeability and mathematical model to fracture tight reservoirs are still a controversial issue.In this paper,based on the physical meaning of Walsh model,the mathematical relationship between Walsh model and power law formula was investigated and the physical meaning of power law coefficient was analyzed and elaborated,and then the stress sensitivity tests on rock samples were conducted.Finally,the applicability of stress dependent permeability formulas was classified according to five pore types.The results show that the best regression fitting occurred in fractured tight reservoir rather than high porosity/permeability reservoir or no crack reservoir using Walsh model.Considering fracture roughness,Walsh model and power law formula are mathematically equivalent.The power law coefficient is the product of fracture “aperture term” and “tortuosity term”.The strong stress sensitivity corresponds to high fracture roughness and tortuosity.Consequently,classification result show that power law formula apply to fractured tight reservoir and microcrack reservoir,exponential formula apply to high porosity/permeability reservoir or no crack reservoir.

Key words: Stress sensitivity, Walsh model, Power law equation, Exponential equation, Fracture roughness

CLC Number: 

  • TE312

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