Well system

A system for conveying a well apparatus in a well from the surface, comprising:

• a composite umbilical having a flowbore and forming an annulus in the well to circulate fluids through the flowbore and annulus;
• a propulsion system attached downhole to said composite umbilical and powered by the circulating fluids;
• and
• said composite umbilical including a tube having a modulus of elasticity which is not the same in all axes.

A system for conveying a well apparatus in a well, comprising:

• a composite umbilical having a conductor disposed in a wall of said composite umbilical;
• a propulsion system attached downhole to said composite umbilical;
• and
• said composite umbilical including a tube having a modulus of elasticity which is not linear and having a yield strain which allows said tube to withstand loads placed on said composite umbilical.

A system for conveying a well apparatus in a well, comprising:

• a composite umbilical for supplying fluids downhole in the well;
• a propulsion system attached downhole to said composite umbilical;
• said composite umbilical including a tube engineered to cause said composite umbilical to achieve substantially neutral buoyancy in the fluids in the well;
• said tube having a modulus of elasticity which is not the same in all axes.

A system for conveying a well apparatus in a well, comprising:

• a composite umbilical for supplying fluids downhole in the well;
• a propulsion system attached downhole to said composite umbilical;
• said composite umbilical being engineered to cause said composite umbilical to achieve substantially neutral buoyancy in the fluids in the well;
• one or more sensors being housed within a wall of said composite umbilical.

A system for conveying a well apparatus in a well from the surface, comprising:

• a composite umbilical having a flowbore and forming an annulus in the well to circulate fluids through the flowbore and annulus;
• said composite umbilical having an energy conductor disposed in a wall of said composite umbilical;
• a propulsion system attached downhole to said composite umbilical;
• said composite umbilical including a tube having a modulus of elasticity which is not the same in all axes;
• said propulsion system being powered by the circulating fluids and being a part of a bottom hole assembly;
• and
• said energy conductor supplying power to said bottom hole assembly.

A system for use in a well from the surface, comprising:

• a composite tube having fibers in a predetermined orientation bonded in a matrix;
• said composite tube having a modulus of elasticity which is not the same in all axes and which withstands axial loads;
• said composite tube including a liner and a plurality of conductors disposed between said liner and said fibers;
• and
• a propulsion system attached downhole to said composite tube and conveying a well apparatus, one of said conductors supplying power to said well apparatus.

A system for conveying a well apparatus through a wellbore having wellbore fluids, comprising:

• a composite umbilical having a conductor disposed in a wall of said composite umbilical;
• a propulsion system attached downhole to said composite umbilical;
• and
• said composite umbilical having a density substantially the same as that of the wellbore fluids and a tube having a modulus of elasticity which is,not the same in all axes.

A system for conveying a well apparatus, comprising:

• a composite tube made of oriented layers of fibers in a matrix and including a liner and a plurality of conductors disposed between said liner and said fiber layers;
• said composite tube having a yield strain which allows said composite tube sufficient bending to be spooled onto a spool;
• said composite tube having a modulus of elasticity which is not the same in all axes;
• and
• a propulsion system attached downhole to said composite tube adapted for attachment to the well apparatus.

A system for conveying a well apparatus through a wellbore having wellbore fluids, comprising:

• a composite tube made of oriented layers of fibers in a matrix and including a liner and a plurality of conductors disposed between said liner and said fiber layers;
• said composite tube having a conductor disposed in a wall of said composite tube and having a modulus of elasticity which is not the same in all axes;
• said composite tube having a yield strain, modulus of elasticity in an axial direction, and a yield stress, said modulus of elasticity in the axial direction being determined by dividing the yield strain into the yield stress required for said composite tube to be spoolable;
• and
• a propulsion system attached downhole to said composite tube.

A system for drilling a wellbore using drilling fluids having a specific gravity between 8.4 and 12.5 pounds per gallon, comprising:

• a composite umbilical having a conductor disposed in a wall of said composite umbilical and a tube having a modulus of elasticity which is not the same in all axes;
• said composite umbilical having a density substantially the same as that of the drilling fluids;
• and
• a propulsion system attached downhole to said composite umbilical applying a pull force on said composite umbilical between zero and 14,000 pounds depending upon the specific gravity of the drilling fluids.