基于环空带压的地下储气库老井泄露量预测研究?

针对老井渗透率难以获得的难题,建立了求解老井渗透率的环空带压数学模型,并给出其解析解。在此基础上,根据渗流力学理论,建立了真实描述天然气沿老井泄露的气水两相渗流模型,并采用全隐式解法进行求解。基于该模型研究了储气库运行压力、井筒渗透率、天然气黏度和井眼尺寸等参数,对储气库天然气沿老井泄漏的影响。计算结果表明,天然气沿老井的泄漏量随着储气库运行压力、老井渗透率和井眼尺寸的增加近似线性增加,随着天然气黏度的增加而逐渐减小。

Study on leakage rate of natural gas through an abandoned well in depleted natural gas reservoir based on SCP

The analytical solution of leakage model for the natural gas through an abandoned well in depleted natural gas reservoir is presented. On this basis, the mathematical model of fluid flow underground the reservoir is established. The fully implicit method is used to discretize the mathematical model and generate a numerical model. The influences of operating pressure of gas storage, permeability of leaky well, natural gas viscosity, and hole size on leakage rate of natural gas are studied. The examples show that the leakage rate of natural gas through an abandoned well increase with operating pressure ,permeability of leaky well and hole size, whereas it decrease with natural gas viscosity.