natural completion
... 正常位势：normal potential 正常完井：natural completion 正常梯度：normal gradient ...
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防冲蚀短管除了壁厚大于正常完井部件外，其管壁通常经过处理，以阻止冲蚀作用的发生，因而不会引起射孔孔眼的接近。
In addition to being heavier than normal completion components, the wall of a blast joint is often treated to resist the jetting action that may result in the proximity of the perforations.
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