In oilfield development, the pore pressure difference between adjacent areas leads to cracks and slipping in the weak structural surface layer, which triggers the shear failure of the casing. The formation slip involves a large range of formation, and its amount is not proportional to the size of the slipping rock mass, which conventional physical models cannot simulate. In this study, based on the abnormal similarity theory, we derived the similarity coefficients of mechanical parameters with different horizontal and vertical proportions. Furthermore, an experimental device for simulating the formation crack and slip under interregional formation pressure difference was developed. Through the experiments, we obtained slip conditions under different pressure differences between adjacent areas and different oil layers and fault surface depths. The study shows that the pore pressure difference between adjacent areas is the driving force of the formation slips. The slip zone is located in the middle of two abnormal pressure zones, and the distance between the adjacent areas can affect the slip range. The deep burial of the oil layer and shallow depth of the weak structural surface can trigger a more significant formation slip. The experimental method proposed in this paper provides an experimental device and method for understanding the formation of cracks and slips on weak structural surfaces. The experimental results provide a theoretical basis for the prevention of shear-type casing damage caused by formation slip.

中文翻译：

---

基于异常相似理论的注采区间压差下地层滑移试验研究

在油田开发中，相邻区域之间的孔隙压力差导致薄弱结构面层出现裂缝和滑移，从而引发套管的剪切破坏。地层滑移涉及的地层范围很大，其量与滑移岩体的大小不成正比，这是常规物理模型无法模拟的。本研究基于异常相似理论，推导了不同水平和垂直比例的力学参数的相似系数。此外，开发了一种模拟区域间地层压差下地层裂缝和滑移的实验装置。通过实验，我们得到了相邻地区不同压力差、不同油层和断面深度下的滑移条件。研究表明，相邻区域之间的孔隙压力差是地层滑移的驱动力。滑移带位于两个异常压力带的中间，相邻区域之间的距离会影响滑移范围。油层埋藏较深，弱构造面较浅，可引发更显着的地层滑移。本文提出的实验方法为理解弱结构表面裂纹和滑移的形成提供了一种实验装置和方法。试验结果为防止地层滑移引起的剪切型套管损伤提供了理论依据。滑移带位于两个异常压力带的中间，相邻区域之间的距离会影响滑移范围。油层埋藏较深，弱构造面较浅，可引发更显着的地层滑移。本文提出的实验方法为理解弱结构表面裂纹和滑移的形成提供了一种实验装置和方法。试验结果为防止地层滑移引起的剪切型套管损伤提供了理论依据。滑移带位于两个异常压力带的中间，相邻区域之间的距离会影响滑移范围。油层埋藏较深，弱构造面较浅，可引发更显着的地层滑移。本文提出的实验方法为理解弱结构表面裂纹和滑移的形成提供了一种实验装置和方法。试验结果为防止地层滑移引起的剪切型套管损伤提供了理论依据。本文提出的实验方法为理解弱结构表面裂纹和滑移的形成提供了一种实验装置和方法。试验结果为防止地层滑移引起的剪切型套管损伤提供了理论依据。本文提出的实验方法为理解弱结构表面裂纹和滑移的形成提供了一种实验装置和方法。试验结果为防止地层滑移引起的剪切型套管损伤提供了理论依据。