The Internal Hook is used for inside casings or tubings to catch all kinds of ropes and fishes such as wire-lines,cables,logging steel pieces,paraffin cutters,etc. Internal hooks are available in two types:Live(adjustable) internal hook and Dead(fixed) internal hook.
Construction
The Internal Hook consists of sub, hook body, and hook. During operation, the hook should be entered into the downhole slightly, and have the hook insert the top of the rope fished, then turning 5～6 laps before lifting up. If there is an increase of the load that indicates the fishes has been retrieved.
