摘要
由于气体性质是压力的函数 ,气井试井与油井相比更加复杂。通过定义合适的拟压力和拟时间 ,微可压缩流动问题的解就可以应用到气井试井分析中。有三种定义拟变量的方法 :压力平方法过于简单 ,因此在现代试井分析中很少应用 ;拟压力法从 2 0世纪 70年代得以广泛的应用 ,但是近年有被标准化拟变量取代的趋势 ;标准化拟变量方法更适合于现代试井分析。文章在标准化拟变量基础上 ,提出了分析气井早期受井筒储存影响的模拟反卷积方法 ,该方法通过反复试算方法逐步消除井筒储存的影响 ,卷积后的数据可用常规的半对数直线段或典型曲线进行分析。最后 ,用油田实例证明了此方法的正确性 ,同其他方法相比 ,本方法计算迅速、准确。
Because gas property is a function of pressure,gas well test is more complicated than oil well test.Through defi ning suitable pseudo pressure and pseudo time,the solutions of the slightly co mpressible flow problems may be used for gas well test analysis.Three methods of defining pseudo variables are commented upon in the paper,i.e.the pressure squ ared method is less used in the modern well test analysis,being oversimplified;t he pseudo pressure method has been widely applied since the seventies of the 20 th century,but is seems to be replaced by normalized pseudo variables in recent years;therefore the normalized pseudo variable method is more suitable for the m odern well test analysis.On the basis of the normalized pseudo variables:an ana log deconvolution method of analyzing gas well early data distorted by wellbore storage is put forward in the paper.By use of such a method,the influence of wel lbore storage well be eliminated through trial and error method,then the analy sis of the data achieved after devonvolution may be carried out by applying the linear portion of conventional semi log curve or the typical curve.Finally it i s proved by an oil field example that the method is correct and it is of quicke r calculating speed and higher calculation accuracy and is easier to be applied, as compared with the other methods.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2002年第5期75-77,共3页
Natural Gas Industry
基金
国家自然科学基金 (No .59995460 )的资助
