【摘要】 本文根据大庆泥岩三轴蠕变试验的数据,通过分析、比较,确定了大庆泥岩的蠕变模式,然后采用回归方法,确定了模式中的各参数。结果表明,大庆泥岩的蠕变模式接近于伯格(Burger)模式,蠕变速率与泥岩的含水量、轴向压力和围压有关。所确定的模式可提供分析泥岩蠕变产生套管岩压外载的依据。更多还原

【Abstract】 Based on the equation form of Burger’s theological model, a non-linear creep constitutive model is presented. The parameters of this model were fitted to tri-axial creep testing data of Daqing shales by non-linear regres-sion. It is observed that the steady-state creep rate of Daqing shales isstrongly influenced by the differential stresses and their water content. Theconstitutive model presented in this paper may be used to calculate theexternal pressure on well casing induced by shale formation creep straining as a result of water flooding.更多还原