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确定岩石扩散系数的非稳态模型及其应用 被引量:3

AN UNSTEADY STATE MODEL FOR DETERMINING ROCK DIFFUSION COEFFICIENT AND ITS APPLICATIONS
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摘要 岩石扩散系数是岩石固有的基本物理量之一,是研究天然气扩散最重要的参数。前人用实验室实测数据求取系数,致使实验时间过长(达千余小时),并存在某些不确定因素;或是在封闭式实验中使用稳定模型处理非稳态的扩散实验过程,导致所求取的扩散系数值产生了大约一个数量级的偏差(误差为1/2~4倍)。在总结了前人经验的基础上,由扩散理论与数学模型相结合的方法,推出了用实测数据求取扩散系数的非稳态模型,并获得了解析解。通过理论分析和大量的实测资料的反复对比计算表明:用该非稳态模型所处理的实测数据,能很好地反映实验中天然气通过岩样的扩散规律。该方法不仅能纠正前人模型所产生的严重偏差,并且可以在不改变原有封闭式实验装置和实验方法的条件下,极大地提高所测岩样的扩散系数精度,同时将原有实验时间缩短至两小时至数小时范围内,从而降低实验成本,提高实验效率,该方法具有较高的推广应用价值。 The rock diffusion coefficient is one of the rock intrinsic basic physical quantities,being the most important parameter of researching natural gas diffusion.In the past,the rock diffusion coefficient was acquired through applying the data measured in laboratory,in which a very long experimental time (more than one thousand hours) was taken and there were certain indeterminate factors,or a steady state model was used for processing the unsteady state diffusion experimental procedure in a closed experiment,which caused the acquired diffusion coefficient value a deviation of an average of about an order of magnitude(with errors of 50%~400%).On the basis of summing up the experiences of our predecessors,according to the method of combining diffusion theory with mathematical model,an unsteady state model of acquiring the diffusion coefficient is derived by use of the measured data and an analytic solution is obtained.Through theoretical analysis and repeated contrast and calculation for a large number of the measured data,it is shown that the measured data processed by the unsteady state model can well reflect the diffusion rule of natural gas′ passing through the rock sample in the experiment.This method not only can correct the serious deviation produced by use of our predecessors′ model,but also may greatly raise the diffusion coefficient's accuracy of the measured rock sample under the conditions of not changing the original closed experimental facilities and method.In addition,by use of this method,the original experimental time was shortened to an interval from two hours to several hours,thus reducing the experimental costs and raising the experimental efficiency.Such a method is of relatively high value for popularization and application.
出处 《天然气工业》 EI CAS CSCD 北大核心 1998年第2期12-16,共5页 Natural Gas Industry
关键词 扩散系数 数学模型 岩石 非稳态模型 天然气生成 iffusion coefficient,Diffusion,Mathematical model,Testing,Rock
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  • 1谷超豪,等.数学物理方程.上海:上海科技出版社,1981.
  • 2Krooss B,Schaefer R.Experimental hydrocarbons in water saturated sedimentary rocks I.A new experimental procedure Org Geochem,1987,11(3).
  • 3Krooss B et al.Light hydrocarbon dirffusion in a caprock chem Gedogy,1988:71.
  • 4威尔特 J R等著,李为正,叶路译.动量、热量、质量的传递原理.北京:国防工业出版社,1984.

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