A new fully coupled numerical model is presented to analyze artificial fracture morphology and artificial fracture propagation during synchronous fracturing. The interaction mechanism between natural and artificial fractures is also considered in this new model. The new numerical solution, based on the boundary element method (BEM) and the finite difference method, is used to solve the problem of coupled rock deformation, fluid interference, stress interference, interface slipping, and opening and to investigate the effect of natural fractures and interference between fractures on fracture morphology during synchronous fracturing. An analysis of factors of influence showed that synchronous fracturing can be used to control the fracture trajectory and construct an effective enhanced geothermal system (EGS). Artificial fractures of two adjacent wells attract each other during synchronous fracturing, and eventually, the two fractures become connected, and the two wells become connected. The choice of well location also has an important influence on the successful establishment of an EGS. To establish an effective EGS successfully, the fracture spacing should preferably be no more than 20 m, and the well spacing should preferably be greater than 400 m. An EGS is easier to construct in a hot dry rock reservoir with a high natural fracture density and small natural fracture angles (preferably less than 30º).

提出了一种新的全耦合数值模型，用于分析同步压裂过程中的人工裂缝形态和人工裂缝扩展。在该新模型中还考虑了自然裂缝和人工裂缝之间的相互作用机理。基于边界元法（BEM）和有限差分法的新数值解用于解决岩石变形，流体干扰，应力干扰，界面滑移和张开耦合问题，并研究天然裂缝的影响裂缝中裂缝之间的相互干扰对裂缝形态的影响。对影响因素的分析表明，同步压裂可用于控制裂缝轨迹并构建有效的增强地热系统（EGS）。相邻两口井的人工裂缝在同步压裂过程中相互吸引，最终使两口裂缝连通，两口井连通。井位的选择对成功建立EGS也有重要影响。为了成功建立有效的EGS，压裂间距最好不大于20 m，井距最好大于400 m。EGS更容易在自然裂缝密度高，自然裂缝角度小（最好小于30º）的干热岩石储层中建造。为了成功建立有效的EGS，压裂间距最好不大于20 m，井距最好大于400 m。EGS更容易在自然裂缝密度高，自然裂缝角度小（最好小于30º）的干热岩石储层中建造。为了成功建立有效的EGS，压裂间距最好不大于20 m，井距最好大于400 m。EGS更容易在自然裂缝密度高，自然裂缝角度小（最好小于30º）的干热岩石储层中建造。