Steering fracturing is the key technology applied to stimulate and enhance oil recovery in tight sandstone reservoirs. In this paper, based on the integration of theoretical background of the porous media fluid mechanics, rock mechanics, and thermodynamics, a heat-fluid-solid three-field coupling stress model is established to simulate the steering fracturing, considering the adjacent well production and rock deformation. To solve the coupling flow equations and coupling temperature field equations, the finite difference method is adopted, while the finite element method is applied to solve the rock deformation equations and provide an explicit alternative approach to the whole model. The model is used to predict stress variations during production/injection processes and multistage artificial fracturing based on the heat-fluid-solid three-field coupling effect. The impact of multiple-field induced stresses on steering fracturing in wells containing vertical fractures can be quantitatively analyzed and simulated accordingly. Finally, a case study is performed to verify the model according to the characteristics of fiber steering fracturing, failure pressure distribution around the well-bore, characteristics analysis of G-function, and interpretation results of microseismic monitoring.

导向压裂是致密砂岩油藏增产增产的关键技术。本文在综合多孔介质流体力学、岩石力学和热力学理论背景的基础上，建立了热-流-固三场耦合应力模型，模拟转向压裂，考虑邻井生产和岩石变形。采用有限差分法求解耦合流动方程和耦合温度场方程，采用有限元法求解岩石变形方程，为整个模型提供了一种显式的替代方法。该模型用于基于热-流体-固三场耦合效应预测生产/注入过程和多级人工压裂过程中的应力变化。可以相应地定量分析和模拟多场诱导应力对包含垂直裂缝的井中转向压裂的影响。最后，结合纤维导向压裂特征、井筒周围破坏压力分布、G函数特征分析和微地震监测解释结果，通过实例对模型进行验证。