Flexible tubular pipe for transporting corrosive hydrocarbons

• Main Authors: TARAVEL-CONDAT, CAROL, EPSZTEIN, THOMAS
• Format: Patent
• Language: Danish; English
• Published: 29.09.2014
• Subjects: BLASTING; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ENGINEERING ELEMENTS AND UNITS; FIXED CONSTRUCTIONS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MEASURING; MECHANICAL ENGINEERING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; THERMAL INSULATION IN GENERAL; WEAPONS

A flexible tubular pipe (1) of the unbonded type intended for transporting fluids in the field of offshore oil production, comprising at least, from the inside outward, a pressure sheath (3), an intermediate sheath (4), tensile armor layers (6, 7) and an external sheath (8), characterized in that the water permeance of said intermediate sheath (4) is at least two times smaller than the water permeance of said pressure sheath (3), and in that the hydrogen sulfide permeance of said intermediate sheath (4) is at least two times greater than the hydrogen sulfide permeance of said pressure sheath (3), and in that the carbon dioxide permeance of said intermediate sheath (4) is at least two times greater than the carbon dioxide permeance of said pressure sheath (3), and in that the methane permeance of said intermediate sheath (4) is at least two times greater than the methane permeance of said pressure sheath (3).