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常用压力恢复曲线求地层渗透率的公式,都是在假定油层全部钻穿条件下得到的。实际上,有许多井只钻开了油层顶部。如任邱地区块状石灰岩底水油藏,其打开程度通常是20—30％,这时压力恢复曲线与全部钻穿地层的井有所不同,用压力恢复曲线求地层参数的方法也有所不同。本文介绍了我们最近求出打开程度不完善井的压力恢复解析公式,及其计算渗透率的方法。用其中某一类曲线还可以推算出未被钻穿油层的底界深度。虽然求出的解析公式很复杂,但最后得出的几个实用公式却非常简单。
Commonly used pressure recovery curve for formation permeability formula, are obtained in the assumption that all the oil drilling conditions. In fact, many wells drilled only the top of the reservoir. For example, in the block limestone bottom water reservoir in Renqiu area, the opening degree is usually 20-30%. In this case, the pressure recovery curve is different from all the wells drilled through the strata, and the method of using the pressure recovery curve to find formation parameters is also different . In this paper, we present the pressure-recovery analytical formula that we recently developed for imperfect wells and how to calculate the permeability. Using one of these types of curves, one can also deduce the depth of the underbore that has not been drilled through the reservoir. Although the analytical formula is very complicated, but the final few practical formula is very simple.