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为了揭示水力压裂过程钻孔应变的特征,开展了水力压裂实验,得到结论:水力压裂经历了水气压缩微损伤阶段,弹性变形阶段以及破坏3个阶段。该实验同时显示了水力压裂过程中孔壁存在的2种主要变形,即拉伸变形、压缩变形,并选取了孔壁拉伸变形一侧,理论上解释了出现该现象的力学原理,对于揭示钻孔水力压裂起裂机理有重要意义。
In order to reveal the characteristics of borehole strain during hydraulic fracturing, a hydraulic fracturing test was carried out. The conclusion is drawn that hydraulic fracturing has experienced three stages: water vapor compression micro-damage, elastic deformation and damage. The experiment also shows that there are two main deformations of the pore wall in the process of hydraulic fracturing, that is, tensile deformation and compression deformation. The tensile deformation side of the hole wall is selected, and the mechanics principle of this phenomenon is theoretically explained. It is of great significance to reveal the mechanism of hydraulic fracturing in boreholes.