Recently, the model development of pressure transient analysis in wells with large-scale fracturing treatments has attracted more and more attention. However, a little work has involved the complex fracture networks with fracture hits. In this study, the transient pressure behaviors of a child well with complex fracture geometries and fracture hits are studied, using an efficient semi-analytical model. The semi-analytical model has the capability to simulate shale well performance by considering complex non-planar hydraulic fractures and fracture hits.

The pressure transient solution of the semi-analytical model is obtained by the incorporation of nodal analysis and Laplace transforms. After the numerical verification of the proposed semi-analytical model, we apply it to analyze the pressure testing data of a child well and a parent well. Through conducting a series of history matching, the most likely fracture parameters of the child well is determined. Results show that the flow regimes of complex fracture geometries with fracture hits include wellbore storage, skin effect, fracture bilinear flow, “fluid feed”, pseudo-boundary dominated flow, unconnected fracture (UF) impact, and pseudo radial flow. During the flow regime of UF impact, the pressure derivative curves exist a second “V-shape”, as the UF improve the matrix permeability and the pressure depletion will be reduce once the flow reaches the UF. A case study in the Lucaogou shale oil reservoir from the Junggar Basin show that complex fracture geometries is developed along the child wellbore. After estimation, the fracture hits between the parent well and child well may via five hitting fractures. The length and conductivity of the hitting fractures are evaluated as 20 m and 120 mD∙m, respectively. This work could be beneficial to performance forecast and well spacing optimization in unconventional reservoirs.

近来，在具有大规模压裂处理的井中进行压力瞬变分析的模型开发引起了越来越多的关注。但是，很少的工作涉及到具有断裂命中的复杂断裂网络。在这项研究中，使用有效的半分析模型研究了具有复杂裂缝几何形状和裂缝撞击的儿童井的瞬态压力行为。半分析模型具有通过考虑复杂的非平面水力压裂和压裂冲击来模拟页岩井性能的能力。

通过将节点分析和Laplace变换相结合，获得了半解析模型的压力瞬态解。在对所提出的半分析模型进行数值验证后，我们将其用于分析子井和母井的压力测试数据。通过进行一系列的历史匹配，可以确定子井最可能的破裂参数。结果表明，带有裂缝的复杂裂缝几何形状的流动形式包括井筒存储，集肤效应，裂缝双线性流，“流体进给”，拟边界控制流，非连通裂缝（UF）冲击和拟径向流。在超滤冲击的流动过程中，压力导数曲线存在第二个“ V形”，因为超滤提高了基体的渗透性，一旦流量到达超滤，压力损失将减少。准the尔盆地卢草沟页岩油储层的案例研究表明，沿子井筒发育了复杂的裂缝几何形状。经过估算，母井和子井之间的裂缝可能是五次打孔。击中裂缝的长度和电导率分别为20 m和120 mD∙m。这项工作可能有助于非常规油藏的性能预测和井距优化。击中裂缝的长度和电导率分别为20 m和120 mD∙m。这项工作可能有助于非常规油藏的性能预测和井距优化。击中裂缝的长度和电导率分别为20 m和120 mD∙m。这项工作可能有助于非常规油藏的性能预测和井距优化。