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

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Chapter 15

Fishing in Cavities

Abstract

When drill-pipe parts in a washed-out section of the wellbore, the fish will not be centered in the hole. A straight-overshot tool string may bypass the top of the fish, touch the pipe, and take weight below the top. If this occurs, rotation slows, and the cut-lip guide will build up a slight torque and then “jump off.” It may be impossible to engage the top of the fish with the tool string, but certain tools and techniques can be used to help latch onto the fish.

Keywords

Cavity

Cut-lip guide

Fishing

Knuckle joint

Wall-hook guide

When drill-pipe parts in a washed-out section of the wellbore, the fish will not be centered in the hole. A straight-overshot tool string may bypass the top of the fish, ...

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