高含硫气藏元素硫沉积预测及应用研究

【作者】 曾平；

【导师】 赵金洲； 李治平；

【作者基本信息】 西南石油学院 ， 油气田开发工程， 2004， 硕士

【摘要】 在高含硫气藏的开采过程中，经常会遇到一些棘手的问题，如硫化氢（H₂S）的剧毒性、腐蚀性和元素硫的沉积。其中元素硫在地层中的沉积是油藏工程师必须时刻关注的重要课题。当地层发生元素硫沉积时，沉积到地层中的元素硫不仅对地层造成严重的伤害，也将对气井的正常生产带来严重的妨害。因此，对元素硫在地层中沉积的研究对该类气田的高效开发具有重要的意义。本文在实验的基础上，从研究元素硫在天然气中的溶解度出发，深入研究了硫在地层中的沉积和堵塞机理，建立了完善的元素硫沉积-堵塞预测模型，并应用于现场实践，取得了满意的结果。 本文的主要研究内容包括：①通过实验研究测定硫在天然气中的溶解度，并分析影响硫溶解度的因素，确定预测硫溶解度的计算模型；②分析硫沉积及造成地层堵塞的机理；③从动态的角度出发，运用物质平衡原理，建立完善的硫沉积-堵塞预测模型；④建立硫沉积地层气体渗流模型并给出其求解方法。 经过系统的研究，本文取得了以下研究成果： ①通过对天然气中硫溶解度的实验研究，完善和提高了对影响硫溶解度因素的认识；②提出了硫在含硫天然气中的溶解方式既包括化学溶解也包括物理溶解的观点；③沉降、捕获和架桥堵塞是硫堵塞地层孔喉的三种主要方式；④建立了能准确描述硫沉积及沉积量的数学模型；⑤建立了描述硫沉积地层渗流规律的微分方程并讨论了其求解方法；⑥得到了硫沉积对地层物性参数（孔隙度、渗透率）及气井产能的影响的认识。更多还原

【Abstract】 Exploiting sour gas reservoir, it often comes up against some hot potatoes, such as shrewd toxicity of sulfured hydrogen, causticity and sulfur deposition. And that sulfur deposition in reservoir is one of key problems that reservoir engineers must deal with. Once sulfur deposition happed, it would bring great impairment to layer and well product. Study, therefore, on the sulfur-deposition in reservoir is meaningful to exploit those gas fields. In this thesis, the mechanism of sulfur-deposition and plugging in layer was discussed based on the experiment of sulfur solubility in nature gas, and set up a model to predict sulfur-deposition and plugging. And it got a satisfied result in application.The major work in this thesis include:(1) measure sulfur solubility in nature gas by experiment, analyze factors that effect it and set up an corresponded theory model ;(2) discuss the mechanism of sulfur deposition and plugging;(3) model well performance base on non-equilibrium deposition and material balance;(4) set up percolation differential equation of sulfur-deposition layer and discuss solution.It gets these results:(l) advanced and developed understanding of factors which effect sulfur solubility in nature gas;(2) brought forward the standpoint that the ways of sulfur dissolved in nature gas include chemic and physical solution;(3)sedimentation, size capture and hydrodynamic bridging are the mechanisms of sulfur plugging;(4)an mathematical model for describe sulfur-deposition and deposited quantity was set up;(5) set up percolation differential equation of sulfur-deposition layer and discuss solution; (6) understand the harm that sulfur deposition lead to layer and well product.更多还原