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倾斜仪裂缝监测技术是通过在地表和附近观测井中放置高灵敏度的倾斜仪,记录压开裂缝导致的地表和地下变形,由此来估计裂缝方位和裂缝的几何形态。本文借鉴Okada线弹性理论和格林函数方法,分别针对弹性半空间均匀模型和分层模型,模拟分析水力裂缝引起的地面和井下变形。模拟结果表明,地表变形模式在两种模型下无明显差异,但当裂缝穿透某一地层时,分层地层模型中水力裂缝引起的井下变形模式与均匀地层中会有明显不同,不适宜采用均匀半无限半空间假设计算井下变形场,研究结果对提高倾斜仪监测水压裂缝技术的数据反演结果的精度和可靠性具有应用价值。
Tilometer crack monitoring technology is through the surface and nearby observation wells placed high sensitivity inclinometer, record cracks caused by pressure cracks on the surface and underground deformation, which can be used to estimate the fracture orientation and fracture geometry. In this paper, Okada line elasticity theory and Green’s function method are used to simulate and analyze the deformation of ground and downhole caused by hydraulic fractures respectively for the uniform model and layered model of elastic half-space. The simulation results show that there is no significant difference between the two models. However, when the fractures penetrate a certain formation, the downhole deformation pattern caused by hydraulic fractures in the stratified stratigraphic model will be obviously different from that in the homogeneous strata, which is not suitable Homogeneous and semi-infinite space Assuming the downhole deformation field is calculated, the research results have application value to improve the accuracy and reliability of the data inversion results of tiltmeter monitoring hydraulic fracturing technology.