高含硫气藏中的硫微粒运移和沉积

在研究高含硫气藏元素硫溶解、析出,硫与高含硫气体混合物相态变化特征,硫微粒的运移、沉积规律和硫沉积储层伤害等基础上,引入空气动力学理论,建立了描述硫微粒气固运移、沉积数学模型,结合实验建立了硫沉积储层伤害模型,并利用所建立的模型模拟某高含硫气藏硫沉积对气藏生产的影响.模拟结果说明:整个气藏在生产过程中都会出现硫沉积;硫沉积对气井生产的影响主要反映在生产后期;后期硫沉积严重的区域主要是在井筒周围;高速气流能够将析出的硫微粒携带出地层,因此,合理控制气井产气量可以减少硫微粒在地层中的沉积,降低对地层的伤害,提高高含硫气藏采出程度.

Migration and deposition of sulfur particle in the gas reservoir with high H2S content

Based on the studies of the dissolution and precipitation of sulfur,the phase-state characteristics of the mixture of the sulfur with the gases with high sulfur content,the migration and deposition law of the sulfur and the damage of the sulfur to the gas reservoir,the mathematical model for describing the migration and deposition of gas-solid phase is established using aerodynamic theory,the effect of sulfur deposition on the production of some gas reservoir with high sulfur content is simulated using the model.The simulation results show that there is the deposition of sulfur in whole production process of the gas reservoir,the influence of the sulfur deposition on the productivity of gas wells mainly appears in the late stage of the production,and the sulfur deposition appears mainly around borehole.The sulfur particle can be carried out from the gas reservoir using high-velocity gas flow.Therefore,the damage of the sulfur deposition to formation can be reduced by reasonably controlling the yield of the gas wells.