Annular fluid manipulation in lined tubular systems

Pipes and tubular conduits – Plural duct – Coaxial

Reexamination Certificate

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Details

C138S104000, C138S116000, C073S049700, C073S049500

Reexamination Certificate

active

06634388

ABSTRACT:

BACKGROUND OF THE INVENTION
Pipes and other tubulars have been lined with polymeric liners (e.g. polyethylene, nylon 11, etc.) for many years and several installation techniques are known to the art. These systems have been used principally in offshore and onshore pipelines, and in downhole production tubulars. Their scope has generally been limited to corrosion and erosion protection. However, they have also been used in monitoring for integrity of the composite liner-host system, as disclosed in U.S. Pat. No. 5,072,622 (Roach & Whitehead)
Generally, the liner resides in close-tolerance with the host pipe along its length, forming a stable composite system, as shown in
FIG. 1
which is a cutaway end view of a tubular
10
lined with a liner
11
. The installed liner may be either of a loose-fit or a compressed-fit variety, both well known to the art. In all but low pressure applications, the stresses induced by fluid pressure from within the liner are transmitted to the surrounding “host” tubular, and resisted by same. The liner acts as an intermediary layer.
SUMMARY OF THE INVENTION
The invention described herein expands the range of possible applications of liners by providing for manipulation and control of annular fluids within the lined tubular systems.
The disclosed embodiments of the invention provide, among other features, a continuous annulus along the length of plastic-lined tubular, and if applicable, through any intermediary joints.


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