E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/22 (2006.01) E21B 19/22 (2006.01)
Patent
CA 2234207
The invention relates to a conduit and coiled tubing system for deployment in a well, in which the conduit is arranged internally of the coiled tubing, and one end of the coiled tubing is attached to a powered device such as a motor or a drill which is to be installed in the well, and wherein the conduit is connected at one end to a power supply at the surface and connected at the opposite end to the powered device and that fluid is provided in the annular space between the conduit and the internal wall of the tube and which provides an upwards buoyancy force to support at least in part the downward weight of the conduit. The specific gravity of the fluid is greater than the average density of the conduit so that a buoyancy force is provided. The specific gravity of the fluid is preferably greater than 1 g/cm3 . The fluid in the annular space may be a concentrated salt solution such as calcium chloride solution, or alternatively an oil or water based gel. Such heavy fluids provide a buoyancy force on the conduit which supports the weight of the conduit along the whole of its weight and this prevent the stretching or breaking of the conduit. The conduit alternatively may comprise at least one buoyancy means. The buoyancy means may be arranged in-between the conduit and the internal wall of the coiled tubing and attached to the coiled tubing or the conduit.
Artificial Lift Company Limited
Head Philip
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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