Sub sea and sub surface tubing and conductors

Details Sub sea and sub surface tubing and conductors Sub sea and sub surface tubing and conductors

1999-12-21

2001-11-27

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Combined fluid conduit and electrical conductor

C174S1020SP, C138S103000, C405S158000

Reexamination Certificate

active

06323420

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method of and an apparatus for providing cabling or an electrically conductive path in tubing, particularly, though not exclusively, in a sub sea or subsurface environment.
BACKGROUND OF THE INVENTION
A simple conventional conducting cable comprises a length of conductive material having a circular cross section, or several such conductors wound or plaited together, the conductor or conductors being wrapped in a insulating sheath. In locations such as the surface of the sea bed, and the borehole of an oil well, several insulating layers and armored layers may be included.
When it is desired to supply power or to carry data from the bottom of a borehole, the conducting cable may either be strapped to the outside of the drillpipe or coiled tubing, or attached to the inside. Attaching the cable to the inside of a drill string or a length of coiled tubing is difficult, as in most methods some form of joining has to take place. This is especially difficult in the case of coiled tubing, as it is difficult to access the joining points over the entire continuous long length of the tube. Known techniques include remotely activatable securement devices attached at intervals along the cable.
It is comparatively simple to strap the conductive cable to the outside of the drill string or tubing, since the outside is freely accessible, but the cable is then prone to damage due to the harsh environment, and the mechanical wear produced by the movement of the drill string through the borehole.
Similar problems occur when including a conductive cable while laying pipelines upon the surface of the sea bed.
OBJECT OF THE INVENTION
The object of the present invention is to provide a method of and an apparatus for providing a conductor which alleviates these problems, supplying a free flowing path and also being convenient to produce.
SUMMARY OF THE INVENTION
According to the present invention there is provided a coiled tubing system including a length of coiled tubing, a cable or conducting member and an inner tube, the inner tube and the cable or conducting member being disposed in the coiled tubing, the coiled tubing and/or the inner tube having been deformed along at least part of their length such that the cable or conducting member is substantially secured between the inner surface of coiled tubing and the outer surface of the inner tube.
The use of the words “coiled tubing” and “coiled tube” refers to the semiflexible continuous tubes used for oil production and similar functions and usually stowed upon a reel, whether or not the tube is actually coiled at a particular time.
The use of the term “cable” is intended to encompass not only electrical cables, but also fiber optic cables, structural cables, and even hollow cables such as hydraulic cable and the like.
Such a tubing and conductor may be used in a downhole environment, or across the surface of the sea bed, for oil production. It may also be used to support the drill bit, or supply well intervention tools, from a floating rig or vessel. It may also be used to transport oil overland. It may of course be used in any situation where coiled tubing is used presently.


REFERENCES:
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patent: 1265194 (1968-08-01), None
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Analysis of Prior Art Against UK Patent Application No. 9930091.5, Publication No. 2345199, XLT43, Mar. 8, 2000 No Date.

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