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The Guide to Oilwell Fishing Operations, 2nd Edition by Joe P. DeGeare

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Chapter 25

Thru-Tubing Debris Catchers

Abstract

The venturi jet junk basket is used to remove various types of high-density debris and formation particles that are too heavy to be circulated to the surface. The flow in the top of the tool passes to the outside via adjustable jets. The jets cause a pressure drop inside the venturi basket, which acts as a suction at the bottom inlet of the tool. The fill is stirred up by the flow down the outside of the tool. At the suction inlet on the bottom of the tool, the fill is carried through finger cages into the tool’s internal filter screen. The strained fluid then passes through the top of the tool and mixes with the pumped fluid. Fill is trapped between the filter and the finger cages. Extension ...

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