Influence of Fluid Damage on Shale Reservoir Stress Sensitivity
Received date: 2011-05-06
Revised date: 2011-07-15
Online published: 2011-10-10
Unconventional oil and gas resources are playing an increasingly important role.Shale gas has become a hot spot and frontier in current research due to huge resources and successful exploitation in the United States.Since shale reservoir is rich in clay mineral,the damages of fluid sensitivity and stress sensitivity are two important damage factors.The coupling action of two damages will greatly decrease the permeability of reservoir and restrict the engineering effect on developing shale gas.Based on fluid sensitivity of clay shale reservoir,we carried out the stress sensitivity,in comparison with difference of stress sensitivity before and after fluid damage.The results show that the stress sensitivity coefficients after fluid damage increase by 30% for the three type reservoirs with medium-strong degree water sensitivity,strong degree alkali sensitivity and medium-strong degree acid sensitivity,indicating the strong stress sensitive degree.The discrete migration of clay mineral particle,hydrate expansion,fluid lubrication cause the decrease of rock strength,make the seepage channel become narrow,and increase the stress sensitivity damage.Therefore,it is a special significance for the protection and economic development of gas shale reservoir to reduce the invasion of incompatible fluid in the well operation.
Key words: Shale; Fluid sensitivity; Stress sensitivity; Clay minerals; Fracture.
HE Jin-Gang, KANG Yi-Li, YOU Li-Jun, CHENG Qiu-Ju . Influence of Fluid Damage on Shale Reservoir Stress Sensitivity[J]. Natural Gas Geoscience, 2011 , 22(5) : 915 -919 . DOI: 10.11764/j.issn.1672-1926.2011.05.915
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