How does CFST make such an interesting economic alternative to metal alloys in CCS wells?

Carbon Capture and Storage requires captured CO2 to be pumped as a liquid down old oil and gas wells. Pumping the liquid CO2 into an empty reservoir below hydrostatic pressures a well would allow the liquid to “evaporate” at the top of the well, resulting in a large temperature drop. This Joule Thompson cooling effect varies with the effective remaining reservoir pressure. Over time this evaporation will reduce as reservoir
pressure increases. CFST is designed with two unique components suited for this purpose, Titanium-Ti and Carbon Fiber-CF. Titanium has a track record as a storage vessel for liquid Helium and CF was used on NASA’s Space Shuttle liquid Oxygen and Hydrogen tanks. These proven track records in extreme cold environments, exhibit fit for purpose application of CFST components. Kobe steel puts the minimum temperature limit of Titanium at minus -269 degrees Celsius (4 degrees Kelvin). Carbon fiber in the grade used in CFST can safely be applied to minus -40 degrees Celsius without losing its strength.
In comparison, (metallic-CRA-alloys) like Duplex or Super Duplex are limited at around minus -50 C and minus -100 degrees C respectively.
Additionally, prices of these (metallic-CRA-alloys) are much higher than CFST, making it a very interesting economical alternative in these applications.

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