高含硫气藏气—固两相多组分数值模型  

GAS-SOLID TWO-PHASE MULTICOMPONENT NUMERICAL MODEL OF ACID GAS RESERVOIRS

作　　者：张勇[1] 杜志敏[1] 杨学锋[1] 游建国[2] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学 [2]中国石油西南油气田公司重庆气矿

出　　处：《天然气工业》2006年第8期93-95,共3页Natural Gas Industry

基　　金：国家自然科学基金"高含硫裂缝性气藏流体相变与气液固耦合综合模型研究"(50474039)项目研究成果

摘　　要：高含硫气藏属于一类特殊高危性气藏,在开发过程中,伴有元素硫的析出、沉积、气相组成变化和沉积硫堆积在孔隙喉道污染地层等特殊现象。一般气藏数值模型没有考虑这些因素的影响,使得基于一般气藏数值模型的数模软件在模拟中不能反映高含硫气藏的开发特性。因此,文章在综合考虑这些因素的基础上,假设析出的固态硫不随气流运移,建立三维气—固两相多组分数学模型,利用Carman-Kozeny沉积伤害模型描述硫沉积对地层孔隙度和渗透率的伤害;使用Roberts所提出的硫溶解关系式描述硫在酸气中溶解度变化;应用I MPES方法将数学模型转换为隐式求解压力、显式求解饱和度的数值模型。在模型中,元素硫的质量守恒关系是从“组分”角度来分析的,因为元素硫在单一的气相或固相中不满足质量守恒。该模型能反映高含硫气藏中元素硫的沉积、气藏流体组分随开发的变化以及沉积硫对储层的伤害等。Acid gas reservoir is a kind of extremely high risky gas reservoir. Its development is characterized by several specific phenomena, such as drop out and precipitation of sulfur element, variation of gas phase compositions and formation damage resulted from precipitation of sulfur in pore throat. These factors are not taken into consideration in ordinary gas reservoir numerical models, thus the development characteristics of acid gas reservoirs cannot be reflected in the process of modeling with the numerical simulation software based on the ordinary numerical model. Therefore, based on a comprehensive consideration of these factors, a 3D gas-solid two-phase multicomponent mathematical model is built by assuming that the solid sulfur dropped out doesn't migrate with gas flow; the Carman Kozeny formation damage model is used to describe the damage of sulfur precipitation to porosity and permeability; the sulfur dissolution formula proposed by Roberts is used to characterize the change of sulfur solubility in acid gas; IMPES method is used to convert the mathematical model into a numerical model for an implicit solution of pressure and an explicit solution of saturation. In this model, the mass conservation of sulfur element is analyzed in respect of 'components', because sulfur element cannot satisfy mass conservation in single gas phase or single solid phase. This model can reflect the precipitation of sulfur element, change of gas reservoir fluid components along with development and the damage of sulfur precipitation to reservoirs.

关 键 词：硫化氢 气藏 多组分相 数学模型 储集层 

分 类 号：TE319[石油与天然气工程—油气田开发工程]