A pipe in pipe assembly. A coupling is used to join the ends of the inner pipe. The inner pipe is centralized within the inner pipe to provide axial resistance but minimum restraint transverse to the axis of the assembly. This provides sufficient flexibility of the inner pipe to accommodate the necessary tolerances to permit the use of the coupling. The inner pipe may be centralized within the outer pipe by the use of foam injected between the inner and outer pipe and a corrugated web sleeve around the ends of the inner pipe. The inner pipe may also be centralized within the outer pipe by the use of a corrugated web bulkhead that fits around the inner pipe and within the outer pipe.
A compound pipe for conveying fluid comprising an inner pipe positioned within an outer pipe such that the walls of the inner pipe and outer pipe define a gap. The compound pipe further including an insulating material for insulating the inner pipe from the outer pipe, the insulating material and outer pipe defining a fluid channel.
A dual bore well jumper establishing fluid communication between a subsea well and a subsea flowline. The dual bore well jumper comprises a first pipe comprising a first pipe bore and a second pipe comprising a second pipe bore, the second pipe being located within the first pipe bore or side-by side with the first pipe. The dual bore well jumper further comprises termination couplings at each for establishing fluid communication with either the subsea flowline or the subsea well. The first and second pipe bores isolate fluid flow in the first pipe bore from fluid flow in the second pipe bore. The dual bore well jumper may optionally further comprise junction assemblies allowing a change in fluid flow direction. The dual bore well jumper may further optionally comprise a bore access module attached to a junction assembly for selective fluid communication with the first and second bores.
