Deformation and Crush Law of Microbulges on Surface of Acid-Etched Fracture
详细信息
- 责任者：Li Qin (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Yi Xiangyi
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(2)
- 关键词：裂缝性油气藏 ; fractured reservoir ; 酸化 ; acidification
- 页码：p.213-216
- 图表：illus., 11 refs.
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
The study of the deformation and crush law of the microbulges on the surface of the acid-etched fracture under the crustal stress provides a theory basis for the acid-etched fracture closing mechanism.Based on the former analysis of the microbulges on the surface of the fracture before and after being acidized,the deformation and crush law of microbulges on the surface of the acid-etched fracture is explained by the Herz elastic contact theory and Drucker-Prager yield criterion. The result shows that the initial force of the microbulges on the surface of the fracture is balanced under the crustal stress so that the deformation and crush will not occur.The deformation degree of the microbulges is affected by the crustal stress,the elastic modulus of rock,the curvature radius of the acid-etched microbulges after being acidized.When the curvature radius of the acid-etched microbulges is greater than the minimum crush radius rmin,the acid-etched fracture can maintain a bigger aperture and a better diversion capacity.
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