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自笔者于1965年提出消除井损计算渗透系数的方法以来,已被广泛应用。但由于已发表的文章过于简单,有些问题没有阐述清楚,从而使得某些读者在应用过程中出现了一些问题。为此须进行一些必要的补充和讨论。一、公式的推导单孔抽水时,在井管附近和井管内,水流形成的水头损失,即井损(图1),使得Q=f(s)曲线变为抛物线。以往一般是先用裘布依公式计算渗透系数,再求其平均值。但因裘布依公式本身没有考虑井损问题,故其结果往往偏小很多。
Since the author put forward in 1965 to eliminate well loss calculation method of permeability coefficient, has been widely used. However, due to the published article is too simple, some problems are not clearly stated, making some readers in the application of some problems. To do this, we must make some necessary supplements and discussions. First, the formula derived Single-hole pumping, near the well pipe and well pipe, the water head loss, that is well loss (Figure 1), making Q = f (s) curve into a parabola. In the past, the permeability coefficient was first calculated by the formula of cloth and then the average value was calculated. However, due to Qiu Bu formula itself does not consider the problem of well damage, so the results tend to be much smaller.