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目前井壁稳定研究集中在静态阶段,没有考虑油田开发中后期地层孔隙压力变化因素。根据渗流力学理论和油藏工程方法,建立储层区域地层压力动态预测模型,预测地层孔隙压力变化规律,以此为基础建立储层坍塌压力、破裂压力变化模型。研究结果表明,地层压力降低引起地层坍塌压力和地层破裂压力同时下降、油井附近的调整井、加密井储层容易漏失;注水井附近的调整井、加密井储层井壁容易坍塌。
At present, the research on borehole stability focuses on the static stage, without considering the pore pressure changes during the middle and late stages of oilfield development. According to seepage mechanics theory and reservoir engineering method, the dynamic prediction model of formation pressure in reservoir area is established to predict the variation of formation pore pressure. Based on this, a model of reservoir collapse pressure and fracture pressure change is established. The results show that the pressure of formation collapse and the fracture pressure of formation decrease at the same time due to the decrease of formation pressure. The adjustment well and the reservoir of confined wells in the vicinity of the well are easily lost. The adjustment wells and the well of the confined well near the water injection well are prone to collapse.