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2019 Vol. 25, No. 4
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Feng YANG, Hao WANG, Bo HUANG, Xiaoqian LI, Chao ZHANG, Chunjin XIAO, Jing LI. STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING[J]. Journal of Geomechanics, 2019, 25(4): 475-482. doi: 10.12090/j.issn.1006-6616.2019.25.04.045
Citation: Feng YANG, Hao WANG, Bo HUANG, Xiaoqian LI, Chao ZHANG, Chunjin XIAO, Jing LI. STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING[J]. Journal of Geomechanics, 2019, 25(4): 475-482. doi: 10.12090/j.issn.1006-6616.2019.25.04.045
shu

STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING

  • 1.

    Research Institute of Petroleum Engineering, Shengli Oil Field, SINOPEC, Dongying 257200, Shandong, China

  • 2.

    Research Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

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Received Date:  14 September 2018
Revised Date:  10 March 2019
    Abstract
  • The understanding of seepage characteristics of low-permeable reservoir is of great significant for oil and gas production and reservoir reconstruction. Therefore, the micro CT scanning technology was used to scan the tight sandstone samples so as to establish a microscopic model that can accurately reflect real structures of rock samples. COMSOL was used to simulate the seepage characteristics of fluid in the pores of rocks, and the seepage characteristics and stress sensitivity of tight sandstone were studied. The results show that:When the pressure difference between the inlet and outlet of the fluid is a constant value, the rock permeability remains unchanged and has no correlation with the specific value of the inlet and outlet pressure. The calculated permeability of rock models in different directions is in the same order of magnitude but slightly different. Under the action of lateral pressure, the flow path narrows, and the fluid overall velocity through the seepage path decreases, which leads to the decrease of permeability. However, where the pore is relatively large, the velocity rises slightly compared with that before the pressure is applied due to the narrowing of the path.
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