油气井测试过程中，处理地面数据的常用方法是估计估算、查表插值的手工法，这种方法既繁琐且误差大。
In the process of well test, the manual methods, estimating method and interpolation by chart, are usually used to deal with surface data, which are tedious and have great errors.
很重要的是要注意，如果估计中不存在偏置，那么有可能是一半估算值高，一半低。
It is important to note that if there is no bias in the estimates, then half of the estimates are high and half are low.
项目估算工具根据可用信息提供工作及持续时间的估计。
Project estimation tools provide estimates of effort and duration based on the available information.
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