Abstract: A method for joining metallic well tubulars to be lowered into a wellbore (4) comprises the steps of: a) providing a first well tubular (6) having an upper end surface (6a), and a second well tubular (7) having a lower end surface (7a); b) lowering the first well tubular (6) into the wellbore (4), leaving the upper end thereof outside the wellbore (4); c) setting the second well tubular (7) in an axially aligned position on the first well tubular (6), with the lower end surface (7a) of the second well tubular (7) set against the upper end surface (6a) of the first well tubular (6); d) keeping the first and second well tubulars (6, 7) in said axially aligned position; e) welding the upper end of the first well tubular (6) to the lower end of the second well tubular (7), forming a circumferential weld bead (WL) in a position corresponding to said upper and lower end surfaces (6a, 7a); and f) lowering into the wellbore (4) the first well tubular (6) and the second well tubular (7) welded together.

Abstract: A method of laser beam welding two pipes together, the method including the steps of arranging two pipes such that a gap is provided between opposed surfaces of the pipes, heating at least one of the pipes by induction heating while the gap is provided between the opposed surfaces of the pipes, and subsequently laser beam welding the opposed surfaces of the pipes together.

Abstract: A method for joining metallic well tubulars to be lowered into a wellbore (4) comprises the steps of: a) providing a first well tubular (6) having an upper end surface (6a), and a second well tubular (7) having a lower end surface (7a); b) lowering the first well tubular (6) into the wellbore (4), leaving the upper end thereof outside the wellbore (4); c) setting the second well tubular (7) in an axially aligned position on the first well tubular (6), with the lower end surface (7a) of the second well tubular (7) set against the upper end surface (6a) of the first well tubular (6); d) keeping the first and second well tubulars (6, 7) in said axially aligned position; e) welding the upper end of the first well tubular (6) to the lower end of the second well tubular (7), forming a circumferential weld bead (WL) in a position corresponding to said upper and lower end surfaces (6a, 7a); and f) lowering into the wellbore (4) the first well tubular (6) and the second well tubular (7) welded together.

Abstract: Described herein is a tubular apparatus for making rigid tubular structures, comprising a flexible cylindrical wall (11, 11?) defining inside it a hollow passage (19), and suited for being wound, in particular on a spool, and continuously laid for use. According to the invention, said cylindrical wall (11, 11?) comprises a fabric (12, 13, 15, 12?, 13?, 15?) comprising inside it at least one gap (14;14?), which develops in the axial direction of said cylindrical wall (11, 11?), said fabric (12, 13, 15; 12?, 13?, 15?) comprising means suitable for operating under traction (15, 15?) when present within said at least one gap (14; 14?) is a fluid (20), injected under pressure for stiffening the tubular apparatus (10; 10?).

Abstract: An inspection apparatus (100) for monitoring the structural integrity of a pipeline (101) comprising a superconducting electromagnet (102) suitable for generating a magnetic field (106); a cryostat (103) suitable for containing and preserving said superconducting electromagnet (102) at a low temperature; at least two magnetic conveyors (104?, 104?) connected at opposite ends of the cryostat (103) suitable for conveying the magnetic field (106) generated by the superconducting electromagnet (102) to the wall of the pipeline (101) and facilitating the closing of a magnetic circuit; at least one sensor system (105) for revealing the intensity of the magnetic field (106). A method for monitoring the structural integrity of a pipeline (101) using an inspection apparatus (100) according to the present invention.

Abstract: An inspection apparatus (100) for monitoring the structural integrity of a pipeline (101) comprising a superconducting electromagnet (102) suitable for generating a magnetic field (106); a cryostat (103) suitable for containing and preserving said superconducting electromagnet (102) at a low temperature; at least two magnetic conveyors (104?, 104?) connected at opposite ends of the cryostat (103) suitable for conveying the magnetic field (106) generated by the superconducting electromagnet (102) to the wall of the pipeline (101) and facilitating the closing of a magnetic circuit; at least one sensor system (105) for revealing the intensity of the magnetic field (106). A method for monitoring the structural integrity of a pipeline (101) using an inspection apparatus (100) according to the present invention.

Abstract: Described herein is a tubular apparatus for making rigid tubular structures, comprising a flexible cylindrical wall (11, 11?) defining inside it a hollow passage (19), and suited for being wound, in particular on a spool, and continuously laid for use. According to the invention, said cylindrical wall (11, 11?) comprises a fabric (12, 13, 15, 12?, 13?, 15?) comprising inside it at least one gap (14;14?), which develops in the axial direction of said cylindrical wall (11, 11?), said fabric (12, 13, 15; 12?, 13?, 15?) comprising means suitable for operating under traction (15, 15?) when present within said at least one gap (14; 14?) is a fluid (20), injected under pressure for stiffening the tubular apparatus (10; 10?).