采用组合钻具进行跟管钻进，通过随钻跟入的套管保护孔壁，解决因钻孔垮塌导致钻探效率和岩心采取率低等技术难题。

The problems of low drilling efficiency and low core recovery due to borehole collapse were solved with pulling in casing while drilling through using combined BHA with casing.

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方法：采用干性颅骨18具，福尔马林固定的头颅标本12具分别进行骨窗及乳突孔的定位测量和桥小脑角结构距骨窗的距离测定。

Methods: The location of bony "window" and mastoid foramen were studied , and the distance from bony "window" to cerebellopontine angle was measured on 18 dry and 12 wet cranial bones.

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缝洞孔复合型具有双重孔隙介质的特点，压力恢复曲线具多台阶型。

The third type has double porosity system, and the build-up curve has a stepwise form.

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