Stress Sensitivity of Low-Permeability Sandstone Reservoir

Abstract:

In the time of low-permeability sandstone reservoir explored, effective stress rise gradually, stress sensitivity has happened, which cause permeability decline. Allowing to initial geostress, the study on Jilin oilfield Fuxin326 oil layer and made the rock core experiment are presented. The experimental results show that the stress sensitivity of this oil layer is small the regularity of permeability changes is in accordance with exponential function. The stress sensitivity of high permeability core is larger than low permeability. Moreover, experiments and theoretical analysis shows that low permeability core has a smaller permeability loss than high permeability core in load and unload process. Loading and unloading process leads to elastic plastic deformation of rocks, and it is the major reason which permeability can not return completely.

• Periodical: Advanced Materials Research (Volumes 753-755)
• Pages: 686-689
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.753-755.686
• Online since: August 2013
• Authors: Shi Ji Li, Ze Hua Wang, Yu Xue Sun, Jian Bo Xie
• Keywords: Loading and Unloading Process, Low-permeability Sandstone, Permeability, Stress Sensitivity

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