Schlumberger

Retrieval and Fishing Tools

Overview Library

Remove stuck items with minimal NPT

Retrieval and fishing tools are used to connect with an item, or fish, that was either lost or intentionally placed in the well. Two main types of fishing necks are used: the internal GS profile and the external JDC profile.

Fishing tools are designed to engage with items that were not originally designed to be engaged (i.e., items without an engagement profile). In many cases, the items are lost or broken off pieces of tool strings or coiled tubing. These items have to be engaged either internally or externally. A bar or rod sticking up would call for an overshot tool; a pipe or other large bore could be caught with a spear. Both the overshot and the spear cut into the metal of the fish to engage with it.

All retrieval tools, and many spears and overshots, are releasable, to provide the option to come off the fish in case the fish cannot be moved. Mechanical release and hydraulic release functions are common. Most operators prefer the hydraulic release choice. However, in gas wells, which do not support a fluid column, or in case the introduction of water to the formation has to be minimized, the mechanic release tool has the advantage. Nonreleasable tools must be used with a disconnect above, and the risk of having to leave them in the well has to be accepted.

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Coil Tubing Services Saves Time and USD 72,000 During CT Milling Operation

Coil Tubing Services Helps Operator Retrieve Difficult-to-Reach Check Valve in 46 Hours, Saving USD 72,000
An engineered approach using CoilTOOLS CT intervention tools and solutions maximized the efficiency of fishing operations for a customer in the the Marcellus Shale.
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