Analysis of sulphur deposition and well production in sour gas reservoirs considering the effect of temperature field

Sulphur deposition in deep sour reservoirs poses a significant challenge to gas well production by impairing reservoir porosity and permeability. Temperature plays a crucial role in controlling sulphur deposition, affecting both its quantity and phase. This study aims to propose a thermal-fluid coupling model to examine the changing characteristics of sulphur deposition and gas well production. By using the finite volume method for numerical solution, the model enables the determination of temperature and pressure distribution within the reservoir, facilitating the prediction of sulphur deposition phases and gas well productivity. The study reveals that considering temperature field variations in the development of sour gas reservoirs leads to increased sulphur deposition saturation and decreased gas well productivity. Gas-liquid sulphur two-phase flow does not occur within the formation. This study provides a scientific basis for optimising development strategies in sour gas reservoirs. [Received: July 3, 2023; Accepted: December 21, 2023]