四参数缔合模型预测酸性气体中硫的溶解度  

Prediction of the sulfur solubility in sour gas by means of the association model with four parameters

作　　者：卞小强[1] 杜志敏[1] 汤勇[1] 

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

出　　处：《天然气工业》2011年第3期73-74,79,共3页Natural Gas Industry

基　　金：国家自然科学基金(编号:50774062);国家科技重大专项基金(编号:2008ZX05016-001)

摘　　要：准确预测酸性气体中硫的溶解度是酸性气藏开发中最重要的研究内容之一。为此,基于化工热力学和超临界流体缔合理论,建立了酸性气体中硫溶解度的半经验、半理论四参数(压力、温度、溶解度和超临界流体密度)缔合模型,该模型同时考虑了高温、高压和密度对缔合反应的影响,克服了Chrastil、Del Valle模型不考虑高压对缔合平衡的影响以及Gordillo模型参变量过多的缺陷,极大地提高了预测硫溶解度的精度。实例计算表明,新建模型预测实验数据精度最高,平均绝对相对偏差为4.57%,而Chrastil、Del Valle和Gordillo模型的平均绝对相对偏差分别为12.65%、12.12%和7.31%。该模型的建立为准确预测高含硫气田硫的溶解度提供了一种简单、有效的方法。Accurate prediction of the solubility of sulfur in sour gases is one of the most important research contents for sour gas fields.Based on thermodynamics in chemical engineering and the association theory of a supercritical fluid,a new semi-theoretical and semi-empirical association model with four parameters(pressure,temperature,solubility,and density of a supercritical fluid) for the calculation of the sulfur solubility in sour gases is established.This association model takes into full consideration the influencing factors of high temperature,high pressure and the density on the associative reaction,not only covering the shortage of the models of Chrastil and Del Valle,which do not consider the impact of high pressure,but also overcoming the shortage of the Gordillo model,which involves too many parametric variables.This model greatly boosts the prediction accuracy of the sulfur solubility.The calculation results of cases show that the prediction accuracy of the experimental data of the newly established model is the highest with the average absolute relative deviation of 4.57%,whereas that of the Chrastil,Del Valle and Gordillo models is 12.65%,12.12% and 7.31%,respectively.Thus,this model provides a simple and effective means for the calculation of the solubility of sulfur in sour gas fields.

关 键 词：硫 酸性气体 溶解度 缔合模型 平均绝对相对偏差 压力 温度 溶解度 超临界流体密度 

分 类 号：TE377[石油与天然气工程—油气田开发工程]