Oilfield tubing string integrally enclosing a fluid production or injection tube and a service line

An oilfield tubing string comprising:

• an elongated tube having a first longitudinal seam and an inside surface and an outside surface, the tube having a cross section perpendicular to the direction of elongation with a substantially continuously convex outer boundary, wherein said inside surface of said tube encloses a first interior passageway;
• a curved sheet of material having a substantially elongated arcuate configuration with an inside surface, an outside surface, and first and second longitudinal edges, wherein said curved sheet is longitudinally positioned outside said tube such that said outside surface of said tube faces said inside surface of said curved sheet and a continuous longitudinal space is maintained therebetween;
• a second substantially longitudinal seam formed at an intersection of said first longitudinal edge and said inside surface of said tube;
• and
• a third substantially longitudinal seam formed at an intersection of said second longitudinal edge and said outside surface of said tube, wherein said second substantially longitudinal seam is continuously maintained a distance apart from said first substantially longitudinal seam, said longitudinal space thereby defining a second interior passageway bounded by said outside surface of said tube and said inside surface of said arcuate sheet, said second interior passageway in fluid isolation from said first interior passageway.

An oil field tubing string comprising:

• an elongated tube having an inside surface and an outside surface, the tube having a cross section perpendicular to the direction of elongation with a substantially continuously convex outer boundary;
• a curved sheet of material having a substantially elongated arcuate configuration with an inside surface, an outside surface, and first and second longitudinal edges, wherein said curved sheet is longitudinally positioned inside said tube such that said inside surface of said tube faces said outside surface of said curved sheet and a continuous longitudinal space is maintained therebetween;
• a first substantially longitudinal seam formed at an intersection of said first longitudinal edge and said inside surface of said tube;
• and
• a second substantially longitudinal seam formed at an intersection of said second longitudinal edge and said inside surface of said tube, wherein said second substantially longitudinal seam is continuously maintained a distance apart from said first substantially longitudinal seam, thereby defining a first interior passageway bounded by said inside surface of said tube and said inside surface of said arcuate sheet and further defining a second interior passageway bounded by said inside surface of said tube and said outside surface of said arcuate sheet, said second interior passageway in fluid isolation from said first interior passageway.

A method for constructing an oilfield tubing string comprising:

• providing a first band having a length, a width, a first longitudinal edge, a second longitudinal edge, a first planar surface, and a second planar surface;
• providing a second band having a length, a width, a first longitudinal edge, a second longitudinal edge, a first planar surface, and a second planar surface;
• longitudinally positioning said first band beneath said second band;
• joining said first and second bands along a first substantially longitudinal seam;
• joining said first and second bands along a second substantially longitudinal seam maintained a distance apart from said first seam;
• joining said first and second longitudinal edges of said first band along a third substantially longitudinal seam, thereby defining a first interior passageway bounded by said first band;
• and
• maintaining a longitudinally continuous space between said first band and said second band, thereby defining a second interior passageway bounded by said first band and said second band.