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。
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.
现有的压裂管柱应用于大斜度超深井都存在明显的不足，影响了压裂施工成功率。
The pipe strings being used now for well fracture all have shortcomings in fracture operation of heavy-deviated and much deeper Wells, that decreases the success ratio of fracture operation.
现有的压裂管柱应用于大斜度超深井都存在明显的不足，影响了压裂施工成功率。
The pipe strings being used now for well fracture all have shortcomings in fracture operation of heavy-deviated and much deeper Wells, that decreases the success ratio of fracture operation.
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