The purpose of cement bond log (CBL) under increasing borehole pressure is to differentiate micro annulus from bypass channel.

在井内加压下进行水泥胶结测井带压作业，其目的是将微环空与串槽区分开。

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In view of the leakage of complex formations, in which the size and shape of leakage path change with the variation of borehole pressure, the concept of "Strong cohesiveness" is presented.

针对漏失通道的尺寸、形状随井内压力变化的复杂井漏，提出了“强粘接性”概念。

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The technology of monitoring well bottom while drilling has high precision, which can control borehole pressure more precise, but also the scope of the pressure gradient is well established.

井下随钻流量监测技术具有很高的监测精度，能够对井眼压力进行更加精细的控制，还能够对压力梯度范围很好的确定。

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Fracking involves drilling a borehole before a high-pressure water mixture is directed at the rock to release the gas.

BBC: Keynsham fracking plans put on hold by UK Methane

Transocean engineers wanted to keep the pressure in the borehole under control with heavy mud while Halliburton set the cement plugs.

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The tests will continue for at least 48 hours, during which time engineers will carefully watch the pressure building up in the well to make sure the damaged borehole can hold it in without a new leak popping open somewhere else.

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