The paper introduces a new technology of CFG pile-pressure grouting of long helical drilling hole, and analyses design, service scope and development trend of CFG pile.

介绍了CFG桩的一种新的成桩工艺——长螺旋钻孔压力灌浆法，对CFG桩的设计、使用范围和发展趋势作了分析。

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For the extended well, high angle drilling, horizontal drilling and deep well drilling, or in the well section of large dogleg severity, or the long open hole, casing wear often happens.

在大位移井、大斜度井、水平井和深井钻井中，或者在狗腿严重度较大的井段，或者在技术套管下入后的长裸眼钻井过程中，常常出现套管磨损问题。

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