低产低压油井关井后，井筒内出现段塞流，测试资料表现出很长的早期段。
To low production and low pressure wells, low pressure makes liquid depth in bore hole to be low before it closed.
在抽油井的抽油过程中和关井期间测量环空内液面高度的一种声波测井方法。
A sonic tool used in a pumping well to determine the distance to the top of the fluid in an annulus during pumping and shut in.
已开发油田的地层压力既可以由采油井关井的压力恢复曲线确定，也可以通过注水井关井的压力降落曲线确定。
The reservoir pressure of a developed oilfield can be determined not only by shut-in buildup curve for a producing well, but also by shut-in falloff curve of injecting water well.
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