The formation fracture profile can't be available before drilling in a new exploration zone.

新探区在未钻井时是没有地层破裂压力曲线的。

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To strong stress sensitivity formation, low BHP reduces pore fluid pressure of near wellbore are which results in the closure of formation fracture.

对于应力敏感性强的储集层，过低的井底压力降低了近井地带地层的孔隙流体压力，导致裂缝趋于闭合。同时，井壁失稳的可能性也大。

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Very severe problems during drilling were circulation loss and borehole collapse because of formation fracture growing, and drilling operation was very difficult.

该气田地层裂缝发育，钻井过程中井漏和井塌问题非常严重，钻井作业十分困难。

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They are encouraging drillers to use tainted coal mine water to hydraulically fracture gas wells in the Marcellus Shale formation, with the twin goals of diverting pollution from streams and rivers that now run orange with mine drainage and reducing the drillers' reliance on fresh sources of water.

WSJ: Pa. pushes drillers to frack with coal mine water