New Evaluation Method of Permeability Stress Sensitivity Based on Visual Fracture Aperture Measurement
Received date: 2010-11-30
Revised date: 2011-03-16
Online published: 2011-06-10
Reservoir stress sensitivity evaluation is an important tool in reservoirs protection,production forecast,and development program decision. Because the fracture surface is not smooth,the fracture width is not a constant value along the fracture,and it can change with the wellbore pressure.It is still debatable which width value property of facture variati on has been argument. To solve this problem,the microscopic image analysis device for loading rocks has been used. The distribution and variation of facture width and permeability has been investigated at different confining pressures. In combination with conventional experimental evaluation of reservoir stress sensitivity,we discuss the eigenvalues of fracture aperture. The results show that aperture distribution would keep a normal distribution when the confining pressure increase between 0MPa and 20MPa,and the process of fracture compaction shows a property of self similarity. The narrow aperture is more sensitive to the confining pressure than that wide one,but the changed range for the absolute value of wide aperture is lager than that of narrow one. The wider fracture aperture constrains the variation of fracture. Permeability of 90% is determined by only 10% of the larger fracture aperture in the fractured rock samples. The fracture aperture corresponding to 90% at ordinate axis in the aperture accumulation distribution curve can be used to evaluate the stress sensitivity of fracture tight reservoir. The new results are consistent with conventional methods,which verify the selected eigenvalue is validity.
LI Da-Qi, KANG Yi-Li, ZHANG Hao . New Evaluation Method of Permeability Stress Sensitivity Based on Visual Fracture Aperture Measurement[J]. Natural Gas Geoscience, 2011 , 22(3) : 494 -500 . DOI: 10.11764/j.issn.1672-1926.2011.03.494
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