Tubular Friction Welding Joining Method without Rotation of the Tubulars
First Claim
1. A method of joining tubulars with friction welding for forming a tubular string to be delivered to a subterranean location, comprising:
- aligning end walls of tubulars to be welded, each said end wall defined by an inner edge and an outer edge;
introducing a tubular segment between said tubulars, said tubular segment having opposed end walls having an inner edge and an outer edge;
bringing said tubular end walls together against opposing end walls of said segment to put said end walls under axial compressive stress; and
joining said tubular end walls to said end walls of said segment using linear movement of said segment in a direction perpendicular to an axis of said aligned tubulars;
allowing said linear movement to an extend where opposed walls as between said segment and said tubular so that an inside edge of one of said end walls moves laterally as far as an outside edge of the other of said opposed end walls;
lowering said joined ends into a borehole to extend the tubular string to the subterranean location.
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Accused Products
Abstract
Tubulars are joined to each other without rotation of the tubulars. A coupling is placed between the aligned tubulars and is supported for rotation or oscillating about its longitudinal axis. The tubulars are clamped in a manner that allows a compressive force to be transmitted to the coupling as the coupling is rotated. An induction device can preheat each connection site before friction welding and/or provide heat as the connection is made and is allowed to cool down. The process can continuously create a string of casing or liner that can be run in or drilled into a wellbore.
10 Citations
22 Claims
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1. A method of joining tubulars with friction welding for forming a tubular string to be delivered to a subterranean location, comprising:
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aligning end walls of tubulars to be welded, each said end wall defined by an inner edge and an outer edge; introducing a tubular segment between said tubulars, said tubular segment having opposed end walls having an inner edge and an outer edge; bringing said tubular end walls together against opposing end walls of said segment to put said end walls under axial compressive stress; and joining said tubular end walls to said end walls of said segment using linear movement of said segment in a direction perpendicular to an axis of said aligned tubulars; allowing said linear movement to an extend where opposed walls as between said segment and said tubular so that an inside edge of one of said end walls moves laterally as far as an outside edge of the other of said opposed end walls; lowering said joined ends into a borehole to extend the tubular string to the subterranean location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22)
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21. A method of joining tubulars with friction welding, comprising:
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aligning end walls of tubulars to be welded, each said end wall defined by an inner edge and an outer edge; bringing said end walls together to put said end walls under axial compressive stress; and joining said end walls using relative movement between said end walls in a direction perpendicular to an axis of said aligned tubulars; allowing said relative movement to an extend where an inside edge of one of said end walls moves laterally as far as an outside edge of the other of said end walls.
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Specification