Due to the decrease of reservoir pressure, the elemental sulfur deposits in sour gas reservoirs, leading to the reduction in the reservoir porosity and permeability. It can also impact the transient pressure and rate behavior of gas wells, which is always reflected in pressure and flow rate type curves. However, few studies focus on transient analysis of multi-fractured horizontal wells affected by sulfur deposition. Therefore, the objective of this work is to develop a comprehensive model to analyze the transient pressure and flow rate of multi-fractured horizontal wells in sour gas reservoirs. Pseudo-time function and pseudo-pressure function are derived and the point source method is applied in this model. Then the proposed model is validated against analytical solutions and real production data. Furthermore, sensitivity analysis for pressure and rate type curves was conducted. Results show that the pressure type curves can be divided into six stages. The reservoir with higher H2S concentration will result in more sulfur deposition, which requires larger pressure difference to maintain a constant rate in the late time. Fracture properties impact flow rate in the early production time, and increasing fracture conductivity and fracture number is helpful to reduce the generation of sulfur deposition. For a smaller reservoir, larger pressure difference is essential to stabilize constant production rate, which means more sulfur deposition will be produced in the reservoir. During the development of sour gas reservoir, it is important to control flow rate to reduce pressure depletion for decrease amount of sulfur deposition. This paper reveals the impacts of sulfur deposition on type curves and provides a comprehensive transient analysis for multi-fractured horizontal wells in the development of sour gas reservoirs.

由于储层压力降低，硫元素在酸性气藏中沉积，导致储层孔隙度和渗透率降低。它还可以影响气井的瞬态压力和速率行为，总是反映在压力和流量类型曲线中。然而，很少有研究关注受硫沉积影响的多裂缝水平井的瞬态分析。因此，本工作的目的是建立一个综合模型来分析酸性气藏中多裂缝水平井的瞬态压力和流量。推导了拟时间函数和拟压力函数，并在该模型中应用了点源法。然后根据分析解决方案和实际生产数据验证所提出的模型。此外，对压力和速率类型曲线进行了敏感性分析。结果表明，压力型曲线可分为六个阶段。裂缝性质影响生产初期的流速，增加裂缝导流能力和裂缝数量有助于减少硫沉积的产生。对于较小的储层，较大的压差对于稳定恒定产量至关重要，这意味着储层中将产生更多的硫沉积。在酸性气藏开发过程中，重要的是控制流量以减少压力损耗，从而减少硫沉积量。本文揭示了硫沉积对类型曲线的影响，并为酸性气藏开发中的多裂缝水平井提供了综合瞬态分析。