页岩水力压裂数值分析  

Shale Hydrofracture Simulation Analysis

作　　者：张健[1] 张国祥[1] 李良[2] 马海春[3] 

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]华能国际电力开发公司,北京100031 [3]合肥工业大学资源与环境工程学院,安徽合肥230027

出　　处：《非常规油气》2017年第5期99-102,共4页Unconventional Oil & Gas

基　　金：中国华能集团科技项目"重庆酉阳东区块储层压裂裂缝形态的主要影响因素研究"(CERI/TY-14-HJKO5)资助

摘　　要：利用abaqus软件对页岩水力压裂进行了数值分析建模,选用cohesive黏聚单元模拟裂纹的扩展过程。本文分析了裂纹发育过程中受到的水压变化过程,水压力在3个坐标轴方向随距离增加而减小;分析了不同压裂时刻页岩裂纹张开特征与注水点距离之间的关系,页岩裂纹的扩展与水压大小分布有一定的关系,但稳定的水力通道发育以后,裂纹基本稳定不变;对不同点水流速度随时间的变化情况进行了对比,水流速度在不同的位置对应时刻达到峰值,并且随距离增加,流速峰值变小;黏聚单元在水压作用下会发生破坏效果,给出了计算结束时对应的损伤程度,发现损伤破坏的扩展与水压大小关系密切,其分布范围代表了裂纹的发育程度。By using abaqus software, the simulation analysis model for shale hydrofracture has been established. Cohesive elements have been chosen to calculate the propagation of crack. The hydraulic water pressure variations have been analyzed and the regularity that the water pressure declines along the three axis directions has been suggested. The shale crack characteristics have been analyzed as the distances increase from the input point. The crack propagates in corresponding with the water pressure distribution. As steady water passage has been opened up, crack will be unchangeable. Water flow velocities at different points have been compared with. The flow velocity peak values at different points appear at different step time and decrease from the input point. The damage situation for cohesive elements have been studied associated with the water pressure and it represents the crack development degree.

关 键 词：页岩 水力压裂 黏聚单元 裂纹 水压 损伤 

分 类 号：TE377[石油与天然气工程—油气田开发工程]