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Bimetallic tubing with corrosion resistant liner material has been developed for sour gas well applications where conventional carbon steel tubes have serious corrosion problems.
The present project deals with the tubing consisting of 4130 steel outer wall and zirconium liner. The manufacturing process starts with an assembled billet. To enhance the bonding between layers, either an interlayer copper or an explosive bonding technique may be used for the billet preparation. The billet is hot extruded and then tube reduced to the final size. The final tube can be heat treated and water quenched to meet the requirements of the oil field tubular products. Tests show that the bonding between layers achieved by explosive bonding and extrusion is excellent.
A section of the tube with zirconium liner exposed to a brine solution saturated with hydrogen sulfide (H2S) under a pressure of 1.72 MPa (250 psi) and a temperature of 493 K for 1368 h showed no sign of corrosion attack by the medium. Other corrosion and stress corrosion tests for zirconium also showed excellent results.
zirconium, zircaloys, cladding tubes, steels, bimetallic tubes, sour gas corrosion, oil wells, gas wells, explosive bonding, petroleum industry
Senior research metallurgist, Teledyne Wah Chang Albany, OR,
Assistant vice-president, Technology Explosive Fabricators, Inc., Louisville, CO