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为准确描述油气田工程中压裂岩体损伤突变裂缝的起裂问题,基于岩体孔隙度的变化,定义岩体损伤变形的损伤变量,并建立岩体形变过程的损伤本构模型。考虑油气藏压裂岩体损伤破坏过程为岩体形变能的积聚增加与突然释放,基于能量守恒原理,建立压裂岩体损伤的张量型折迭突变模型。给出压裂岩体损伤突变平衡方程与岩体损伤突变破坏能量释放量计算模型。计算、分析长庆油田苏里格区块石英砂岩与岩屑砂岩水力压裂岩体损伤突变破坏能量释放量变化规律,为油气田压裂岩体损伤破坏裂缝形成的研究提供新方法。
In order to accurately describe the initiation and fracture of fractured rock mass with fault damage in oil and gas field, the damage variables of rock mass damage deformation are defined based on the change of rock porosity, and the damage constitutive model of rock mass deformation process is established. Considering the damage and failure process of the fractured rock mass in the reservoir is the accumulation and sudden release of the deformation energy of the rock mass. Based on the principle of energy conservation, a tensor folding catastrophe model of fractured rock mass damage is established. The equilibrium equation of damage and failure of fractured rock mass and the calculation model of energy release amount of damage and failure of rock mass are given. The variation regularity of the energy released during the damage and rupture of the fractured rock mass in the Sulige block, Changqing Oilfield, is calculated and analyzed, providing a new method for the study of the formation of damage and fracture in fractured rock mass in oil and gas field.