Therefore, it's important to make research on the force and deformation of tubing string.

因此，研究水平井测试管柱的受力及变形具有重要意义。

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It has a practical meaning for the strength design and combination usage of drill string, casing and tubing under different technological conditions.

对处于不同工艺条件下的钻柱、套管、油管的强度设计和组合使用等均有实际意义。

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Installing an electrical conductor or hydraulic conduit further enhances the capability of a coiled tubing string and enables relatively complex intervention techniques to be applied safely.

安装一个电导体或水力导管将进一步地提高挠性管柱的性能，并使相对复杂的采油井下工艺措施技术能安全地被使用。

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