Page 115 - Well Control for Completions and Interventions
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Completion Equipment 107
Figure 3.16 Swell packer.
They are have largely replaced ECPs as the method of choice for open
hole multiple zone completions, where they are used to provide isolation
between zones. They are also used as an alternative to cemented and per-
6
forated liners, and have been used at the liner top as a cement assurance
tool (Fig. 3.16).
3.5 WIRELINE ENTRY GUIDES
The wireline entry guide (WEG) or mule shoe is commonly used
at the bottom of a tubing string. It has two functions. To guide the tubing
into a liner top PBR or packer seal bore, and to guide through tubing
intervention tools back into the tubing. To perform these functions, a
properly designed WEG should have internal and external tapers. Some
entry guides are “self-indexing.” These self-indexing mule shoes make it
easier for seals to engage in a PBR in deviated wells.
3.6 LINER TOP SEAL ASSEMBLY
A liner top seal is constructed from a series of chevron (V) packing
stacks or bonded seals mounted on a flow mandrel (Fig. 3.17).
