西安石油大学学报（自然科学版）2017，Vol.32Issue(1)：57-63,7.DOI:10.3969/j.issn.1673-064X.2017.01.009
页岩储层压裂裂缝表面软化规律实验研究
Experimental Study on Surface Softening Law of Fracturing Fracture in Shale Reservoirs
摘要
Abstract
In order to study the effect of fracturing fluid retained in shale reservoir on the mechanical strength of fracturing surface,the spontaneous imbibition experiments of the typical shale reservoir cores in China were carried out,and the surface hardness of shale frac-turing fracture was tested. The relationship between the spontaneous imbibition ability of shale and the hardness of fracture surface was analyzed ,and the variation laws of the mechanical properties of shale fracture surface in different water-rock reaction stages were studied according to the experimental results. The results show that,the first day of water absorption is the main stage of hardness damage to sur-face hardness of shale fracture,the hardness damage of fracture surface caused in the stage accounts for 50% ~75% of the total dam-age,and then the hardness damage continuously and slowly increases with time. There is no direct relation between the imbibition rate of shale,the water absorption amount of the unit volume rock and the softening degree of fracture surface,but there is a positive correlation between the pore volume multiple of water absorption,the effective driving force coefficient and the softening degree of shale fracture surface,that is,the larger the pore volume multiple of water absorption,the effective driving force coefficient,the more intense the water-rock interaction.关键词
裂缝/自发渗吸/页岩/表面硬度/伤害Key words
shale/fracturing fluid retention/spontaneous imbibition/hardness damage of fracture surface分类
能源科技引用本文复制引用
周彤,张士诚,杨柳,李四海,徐正辉..页岩储层压裂裂缝表面软化规律实验研究[J].西安石油大学学报（自然科学版）,2017,32(1):57-63,7.基金项目
国家重点基础研究发展计划"973"项目(编号:2013CB228004) （编号:2013CB228004）
高等学校博士学科点专项科研基金课题"页岩气藏大规模非对称体积改造基础理论研究"(编号:20120007110004) （编号:20120007110004）
