Numerical Simulation of Sour Gas Fractured Wells with the Effects of Sulfur Deposition Considered

摘要

With the decreasing of temperature and pressure, precipitated elemental sulfur may deposit and block pore during sour gas reservoir development. Based on carbonate core damage experiences, combined with solubility theory of elemental sulfur, gas percolation numerical models are established when the effects of sulfur deposition are considered. The effect of deposited sulfur on pressure decline and the necessity of acid fracturing treatment to sour wells development are analyzed. The results show that the more volume of sulfur deposition is, the quicker the pressure decreases. Acid fracturing can not only increase flow capacity, but also slow pressure fall and delay sulfur precipitation.