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Experimental method of fracture stress sensitivity for overpressured gas reservoirs
PAN Weiyi1, WANG Youqi2, TANG Shuheng1, LUN Zengmin2, WANG Haitao1
(1.School of Energy Resources in China University of Geosciences, Beijing 100083, China;2.SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China)
Abstract:
The naturally occurred fractures in overpressured gas reservoirs are the main flow paths for natural gas production. Fractures with various distribution states can have different behaviors of stress sensitivity during the reservoir development. Two loading methods were used to study the fracture 's stress sensitivity via core testing experiments. Radial load was used to simulate stress sensitivity of horizontal fractures and fractures with low angles, while axial load was employed for the vertical and high angle fractures. Also, a computational method was used to adjust the gas permeability in terms of the property of overpressured gas. The results demonstrate that the experimental method established in this study is very useful to study fracture stress sensitivity in overpressured gas reservoirs. It is shown that the vertical fractures have no stress sensitivity while horizontal fractures are sensitive to the stress distribution, with the sensitivity of high angle fractures in between.
Key words:  fracture  stress sensitivity  overpressured gas reservoir  experimental method  radial load  axial load