损伤对爆生气体作用下孔壁岩石开裂规律的影响  

Effects of Damages on Gas-Driven Radial Fracture Induced by Blasting within a Cavity

作　　者：林英松[1] 孙丰成[1] 丁雁生[2] 付英军 蒋金宝[1] 王莉[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东东营257061 [2]中国科学院力学研究所,北京100081 [3]中海石油研究中心,北京100027

出　　处：《石油钻探技术》2007年第4期25-27,共3页Petroleum Drilling Techniques

基　　金：中国石油化工股份有限公司科研项目"水力裂缝层内爆炸提高采收率技术基础研究"(编号:P03051)部分研究成果

摘　　要：在准静态假设条件下,应用有限元计算软件ANSYS9.0对爆生气体作用于水泥试样中心孔的冲击开裂现象进行了数值模拟研究。根据数值模拟计算结果,分析了初始损伤(宏观微裂纹)的存在对爆生气体作用下孔壁岩石开裂规律的影响,总结出了在爆生气体作用下柱孔孔壁上周向应力分布及裂纹生成扩展的基本规律。在简化模型基础上进行的计算,可以解释柱孔开裂实验中不可能出现一条裂纹的现象。计算结果与实验结果对比分析说明,所建立的计算模型是合理的,基于断裂理论的裂纹面附加拉应力的假设能够反映实际现象。Based on near static assumption, the finite element software ANSYS9.0 was used to numerically simulate the cracking of cement samples under the blasting gas. Based on the numerical simulation results, the impacts of the existing of initial fracture on cracking of the borehole rock under the blasting gas were analyzed. The basic law of the stress distribution on the borehole and creation and extending of the fracture were summarized. The calculation based on the simplified model can explain the reason why more than one fractures were created in the experimental study. The comparison of the calculation results and the experimental results indicates that the model is reasonable and the assumption of additional tension based on fracturing theory can represent the actual condition.

关 键 词：爆炸压裂 裂纹 数值模拟 应力分析 

分 类 号：TE21[石油与天然气工程—油气井工程]