科研之友
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摘要
Shearing slippage damage and opening mechanism of natural fracture during the process of hydraulic fracturing in naturally fractured reservoir are studied by theoretical analysis, experimental validation and example analysis. theoretical analysis shows that horizontal differential principal stress, approaching angle and coefficient of friction are the main factors that cause fracture shearing slippage damage. In the condition of low horizontal differential principal stress, low approaching angle or low coefficient of friction, shearing slippage damage of natural fracture tend to happen under the influence of hydraulic fracture. The degree of natural fracture opening is determined by horizontal differential principal stress and features of rock mechanics. Experimental results show that after interaction with hydraulic fracture, the previously closed natural fracture opens and the shearing slippage damage happens in the condition of low horizontal differential principal stress or low approaching angle, while in the condition of high horizontal differential principal stress and high approaching angle, the natural fracture is filtered and there is no shearing slippage damage. Fracture opening boundary and shear slippage boundary are given out through example analysis, and the utmost containment of natural fracture is described. The example analysis shows the utmost containment of natural fracture decreases while approaching angle increases.
- 出版日期2008
- 单位中国石油大学（华东）
