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.
套管作为管道穿越处的保护管，在穿越时能对管道的防蚀层起到很好的保护作用。
As protective pipe of pipeline crossing, casings can protect the protective coating of inner pipeline very well.
套管作为管道穿越处的保护管，在穿越时能对管道的防蚀层起到很好的保护作用。
As protective pipe of pipeline crossing, casings can protect the protective coating of inner pipeline very well.
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