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

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Chapter 28

Thru-Tubing Underreaming

Abstract

An underreamer is designed to pass through a down-hole restriction, open up below the restriction, clean the hole to full gauge, and then close up for retrieval through the restriction. The restriction is typically in the production-tubing string in the form of nipple profiles, mandrels, and other completion accessories.

Keywords

Bottom-hole assembly

Coiled tubing

High-viscosity polymer sweeps

Two-blade underreamer

Underreaming

An underreamer is designed to pass through a down-hole restriction, open up below the restriction, clean the hole to full gauge, and then close up for retrieval through the restriction. The restriction is typically in the production-tubing string in the form of nipple profiles, ...

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