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。
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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