中国石油大学学报（自然科学版）Issue(4)：77-84,8.DOI:10.3969/j.issn.1673-5005.2015.04.010
裂缝充填物对脉动水力压裂应力扰动效果的数值模拟
Numerical simulation of influence of crack fillers on stress disturbance effect during pulsating hydro-fracturing
摘要
Abstract
A linear slip deformation model, a finite-difference method and staggered-grid were used to investigate the stress propagation and distribution in fractured formation during the pulsating hydro-fracturing (PHF) process, and the influence of crack fillers was analyzed at different crack intervals and source frequencies. The numerical simulation results show that the influence of mineral-filled cracks on PHF stress disturbance is weak, so that its fractured zone can be considered as homoge-neous. When the crack is filled with fluid, it can cause the reflection of pressure waves, which will form a great velocity con-trast between strong and weak reflection zones to generate shear stress, then causing tensile damages. However, if the crack is too close to the pulsating source, the reflected and propagated pressure waves will disturb each other and reduce the fractu-ring effect. The influence of gas-filled cracks is similar to that of the fluid-filled, but its reflection of pressure waves is much stronger, which means a longer crack interval can be applied to promote the stress disturbance effect. The PHF technique can be used in coal seams with fracture anisotropy to increase their permeability. When the interval between initial artificial frac-tures and natural fractures is 2-3 times larger than the length of initial artificial fractures, a better PHF stress disturbance effect can be acquired.关键词
脉动水力压裂/线性滑移模型/裂缝充填物/应力扰动效果/最优间距Key words
pulsating hydro-fracturing/linear slip deformation model/crack fillers/stress disturbance effect/optimal inter-val分类
能源科技引用本文复制引用
陆沛青,李根生,沈忠厚,黄中伟,盛茂,迟焕鹏..裂缝充填物对脉动水力压裂应力扰动效果的数值模拟[J].中国石油大学学报（自然科学版）,2015,(4):77-84,8.基金项目
国家自然科学基金项目(51221003) （51221003）
国家科技重大专项(2011ZX05037001) （2011ZX05037001）
