A generic name given to tools that engage on the outer surface of a tubing string or tool assembly, generally for fishing purposes.

与油管柱或工具装置的外表面相接合的工具通称，一般用于打捞目的。

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The maxim setting depth of tubing is related to its strength, density, inner and outer pressure difference as well as wellbore fluid's buoyant force to tubing string.

油管的最大下入深度与油管本身的强度、密度、油管内外压差、井中流体对油管柱浮力有关。

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The maxim setting depth of tubing is related to its strength, density, inner and outer pressure difference as well as wellbore fluid's buoyant force to tubing string.

油管的最大下入深度与油管本身的强度、密度、油管内外压差、井中流体对油管柱浮力有关。

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