考虑多因素耦合的高含硫气藏固硫沉积数学模型研究与应用OA
Research and application of a multi-factor coupling numerical simulation model for sulfur deposition in sulfur gas reservoirs
高含硫气藏开发过程中的硫沉积现象会堵塞储层、降低储层的渗透率,甚至造成气井的停产.当前主流的硫沉积预测模型存在忽略了酸性气的携硫作用以及多孔介质中的颗粒沉积环境等问题,难以精准描述硫运移沉积规律及储层伤害影响.为此,基于微粒模拟的实验结果,总结了多孔介质中微粒沉积的规律,建立了新的固硫微粒运移及沉积数学模型,同时结合实验获得的储层伤害模型,综合建立了考虑固硫沉积及储层伤害的数学模型,应用于实际气藏研究.研究结果表明:①提出硫颗粒沉积模型,明确沉积率与颗粒直径、孔隙直径呈指数关系,与气体流速呈线性关系;②悬浮硫在储层中含量较少,主要都聚集在井筒中及近井筒范围内,沉积硫沉积范围比悬浮硫大,主要聚集在近井筒10 m的储层中,远离井筒的区域也有沉积,距离越远沉积量越少;③将固硫沉积模型首次应用至D气藏,模拟了硫沉积发生的时间和位置,并预测考虑固硫沉积30年的生产指标,表明硫沉积对气藏开发具有显著的负面作用.结论认为,建立的数值模拟方法能有效刻画高含硫气藏中硫颗粒的析出、运移、沉积及其对储层的伤害过程,为高含硫气藏的开发预测和工艺优化提供了重要的理论依据和技术支撑.
Sulfur deposition occurring during the development of sulfur gas reservoirs may cause reservoir blockage,reduce reservoir permeability,and even stop well production.Existing popular sulfur deposition prediction models neglect the capacity of sour gas to carry sulfur and the particle deposition environment in porous media,making them fail to accurately describe the patterns and reservoir damages of sulfur particle migration and deposition.Based on the results of particle simulation experiments,this paper reviews the patterns of particle deposition in porous media and proposes a new numerical model for solid sulfur particle migration and deposition.Moreover,combined with the experiment-derived reservoir damage model,a numerical simulation model considering solid sulfur particle deposition and reservoir damage is established and then applied to an actual gas reservoir.The following results are obtained.First,the proposed sulfur particle deposition model reflects that the deposition rate is exponentially correlated with particle diameter and pore diameter,and linearly related to gas flow velocity.Second,suspended sulfur is scarce in reservoirs,mainly distributing in and near the wellbore.Sedimentary sulfur is more widely deposited than suspended sulfur,and it is mainly concentrated in reservoirs within 10 m near the wellbore,and occasionally in zones far away from the wellbore—the farther from the wellbore,the less the deposition.Third,the proposed model was applied,for the first time,to the D gas reservoir,simulating the time and location of sulfur deposition and predicting production indicators for 30-year solid sulfur deposition.It is found that sulfur deposition has a remarkable negative impact on the development of gas reservoir.The proposed numerical simulation model can effectively represent the precipitation,migration and deposition of sulfur particles in sulfur gas reservoirs and its damage to reservoirs,providing valuable theoretical evidence and technical support to production predication and process optimization of such reservoirs.
徐中一;糜利栋;张睿;曾大乾
中国石化石油勘探开发研究院中国石化石油勘探开发研究院中国石化石油勘探开发研究院中国石化石油勘探开发研究院
能源科技
高含硫气藏硫沉积固硫颗粒运移储层伤害数值模拟
Sulfur gas reservoirSulfur depositionSolid sulfur particle migrationReservoir damageNumerical simulation
《天然气工业》 2026 (4)
95-101,7
中国石油化工股份有限公司科技项目"普光气田剩余气分布及提高采收率技术"(编号:P23198). 本论文成果受中石化科技部项目(项目编号:P24158)资助,特此感谢.
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