So the string has no tension, the string goes limp and the bucket of water and you are weightless.

绳子没有张力，完全松弛,不管吊着的是你还是水桶，均为失重状态。

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Made up of oil expanding type or water expanding type expandable elastomer material, mechanical pipe string, centralizer and etc.

由油胀式或水胀式可膨胀弹性体材料与机械管柱、扶正器等构成。

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Considering the status of separate layer water injection in directional well, the injection tools and pipe string are developed and collocated reasonably.

针对定向井分层注水的现状，对定向井分注工具和分注管柱进行了研制和合理配置。

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