Experimental Study on the Pressure Sensitive Effects of Cores Based on CT Scanning

Li Rongqiang; Gao Ying; Yang Yongfei; Li Yang; Yao Jun

doi:10.11911/syztjs.201505007

Volume 43 Issue 5

Sep. 2015

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Petroleum Drilling Techniques > 2015 > 43(5): 37-43. > DOI: 10.11911/syztjs.201505007

Li Rongqiang, Gao Ying, Yang Yongfei, Li Yang, Yao Jun. Experimental Study on the Pressure Sensitive Effects of Cores Based on CT Scanning[J]. Petroleum Drilling Techniques, 2015, 43(5): 37-43. DOI: 10.11911/syztjs.201505007

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Experimental Study on the Pressure Sensitive Effects of Cores Based on CT Scanning

1.
School of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao, Shandong, 266580, China;
2.
Oil Production Engineering Department, Sinopec Shengli Oilfield Company, Dongying, Shandong, 257001, China;
3.
China Petroleum & Chemical Corporation, Beijing, 100029, China

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Received Date: July 14, 2015
Revised Date: August 26, 2015

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Abstract

Abstract

In order to reveal the microscopic mechanical mechanisms of rock stress sensitivity and to further understand stress sensitivity, a geometry and topology structure analysis was carried out using CT scanning technology which could show the actual internal structure characteristics of rocks, and can be combined with digital cores and a pore network model. Following this procedure, the relationships between effective stress,pore structure and permeability were obtained, and pore structure parameters and percolation capacities were compared during the increase and decrease of effective stress. It is shown that with the increasing of effective stress, the pore radius distribution curve shifted to the left, the shape factor probability curve shifted to the right, the pore throat connectivity became worse resulting in a decrease in permeability, and vice versa. The pore structure deformation was characterized by stress sensitivity hysteresis. After the effective stress dropped, permeability could not fully recover. In summary, it is necessary to pay attention to the effect of stress sensitivity and fluid flow on the deformation of rock pores.
- CT scanning,
- pressure sensitive effect,
- digital core,
- pore network model,
- porosity,
- permeability

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References

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Experimental Study on the Pressure Sensitive Effects of Cores Based on CT Scanning

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