Performance of Eleven Ti Alloys in High Temperature, High Pressure Brine Solution

Abstract

There is currently increasing interest in titanium alloys for geothermal production well casings due to their combination of strength, low density and corrosion resistance. These alloys may be able to augment the current list of commonly used materials available to resist corrosion and stress corrosion cracking in high temperature, high pressure sour brines. A total of eleven titanium alloys have been studied with four having platinum group metal additions.

There is data on nickel based alloys and low strength titanium alloys like Ti Gr7 at high temperature in sour brines, however there is little data on the behavior of new high strength titanium alloys in these environments to qualify their use. This paper will present the performance of eleven titanium alloys with respect to corrosion rate, and crevice corrosion susceptibility in high temperature, high pressure brine environments. The paper will also address the ability to weld and form titanium alloys intended for brine solutions.