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对漏失期间三种典型的井壁变形现象进行了研究,所完成的参数研究可用于评价井壁变形大小。井壁变形包括:①漏失期间直井周围所诱发的倾斜裂缝,可变参数为裂缝尺寸/井眼尺寸、裂缝角度、井眼压力以及σH1、σH2、σV的比值;②在正常地层、冲断层和横冲断层区块钻进时所引发的井壁变形;③由于所诱发的裂缝与地层最小应力相垂直,在斜井中所引发的井壁变形。
Three typical borehole deformation phenomena during the loss period are studied. The completed parameter studies can be used to evaluate the deformation of the shaft wall. The deformation of the shaft wall includes: (1) the inclined cracks induced around the vertical well during the loss, the variable parameters are the ratio of the fracture size / borehole size, fracture angle, borehole pressure and σH1, σH2, σV; ② In the normal strata, The wellbore deformation caused by the thrusting of the thrusting block; ③ The deformation of the wellbore caused in the inclined well due to the vertical fracture induced by the minimum strata stress.