Wormhole dissolution pattern study in complicated carbonate rock based on two-scale continuum model and equivalent seepage theory
Received date: 2015-08-03
Revised date: 2015-10-11
Online published: 2016-01-10
Carbonate rock has great heterogeneity,and possesses the characteristics of complex physical property and natural fractures development,thus it is often treated by acidizing to create wormhole.Wormhole dissolution patterns are significantly affected by those characteristics.Hence,a dual-scale continuum model and equivalent seepage theory were used to study,the influence of in-layer heterogeneity,interlayer heterogeneity and natural fractures upon wormhole pattern and acid injection volume when break through (PVBT) were analyzed.The results show that an approximately the same optimum acid injection rate that leads minimal PVBT in different heterogeneity level do exist,and the minimal PVBT firstly increased and then decreased with the increase of heterogeneity level.High permeability zone leads to sharp decrease of PVBT ,but the inference of permeability increase on PVBT decrease becomes weak gradually when the permeability increases to a certain level.The extension direction of wormhole is decided by natural fractures when acid flows into it,and the PVBT decreased sharply by the fractures which are parallel to the acid flow direction.With the increase of fracture length,the acid injection volume tends to decrease linearly.The study is of great significance in guiding matrix acidizing of carbonate reservoirs.
Key words: Carbonate rock; Wormhole; Heterogeneity; High permeability zone; Natural fracture
Li Yong-ming,Liao Yi,Zhao Jin-zhou,Wang Yan-chen,Peng Yu . Wormhole dissolution pattern study in complicated carbonate rock based on two-scale continuum model and equivalent seepage theory[J]. Natural Gas Geoscience, 2016 , 27(1) : 121 -127 . DOI: 10.11764/j.issn.1672-1926.2016.01.0121
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