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Experimental Study on the Effect of Micro Pore-throat Structure on Stress Sensitivity

Xiaofeng Tian1, Linsong Cheng1, Qiang Guo2 , Wenqi Zhao3, Yiqun Yan3, and Xiaohui He3
1.China University of Petroleum, Beijing, China
2.Missouri University of Science and Technology, Missouri, America
3.China University of Petroleum, Beijing, China
Abstract—The characteristics of stress sensitivity is the theoretical foundation to determine the formation pressure level in the tight oil reservoir. Therefore many studies focus on it. However, no existing study explains the mechanism of stress sensitivity in nature. Therefore this paper is to solve the problem. In this paper, experiments were conducted to study the characteristics of stress sensitivity in the tight oil reservoir. Then casting thin section, scanning electron microscope and constant-speed mercury injection experiments were performed to study the diagenesis and pore-throat structure. It is found that due to the support of ferrocalcite and quartz, the compressive strength of tinier throats is larger. The gas stress sensitivity is determined by the maximal throat radius. And the relative location of minimal throats for liquid to flow to the peak of pore-throat distribution is the key factor to determine the liquid stress sensitivity.

Index Terms—tight oil reservoir; stress sensitivity; micro pore-throat structure; minimum throats for liquid to flow

Cite: Xiaofeng Tian, Linsong Cheng, Qiang Guo, Wenqi Zhao, Yiqun Yan, and Xiaohui He, "Experimental Study on the Effect of Micro Pore-throat Structure on Stress Sensitivity," Journal of Industrial and Intelligent Information, Vol. 2, No. 3, pp. 184-188, September 2014. doi: 10.12720/jiii.2.3.184-188
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