Weibull增长曲线预测油田开发指标的0.63212准数

0.632,12 criterion of Weibull increase curve to predict oilfield development indexes.

根据威布尔（Ｗｅｉｂｕｌ）增长曲线应用于油田开发指标预测的方法，推导了相应的计算最大可采储量ＮＲｍａｘ的公式，发现了一个重要的关系：当时间与产量Ｑｔ的乘积ｔＱｔ达到最大值时，累积产量Ｎｐ／ＮＲｍａｘ为０．６３２１２。使用这一准数，可以准确而简便地计算出ＮＲｍａｘ及ａ和ｂ等系数。算例表明，这种关系的使用方法有很好的效果，进一步证明威布尔增长曲线在油田开发指标计算和预测中的重大价值。图２表１参２（陈志宏摘）

In terms of the method for forecasting oilfield development indexes by using Weibull increase curve, the according formulas for calculating maximum recoverable reserves N Rmax were derived and an important relationship: proportionality of cumulative production N p and N Rmax is identically equal to 0.632,12, i.e. N p/ N Rmax≡0.632,12, when product of production Q t and time t is maximum, was found. Thus one can calculate N Rmax, a and b accurately and easily and make calculating and predicting relationships of Q t t and N p t more accurately. An example shows the method of use and very good using effect of the relationships. It is proven further that the Weibull increase curve has large value in calculation and prediction of oilfield development indexes.