Specific alloys can prevent corrosion in underground CO2 storage

Materials selection is critical when storing CO2 as a supercritical liquid. Alleima can provide the types of corrosion-resistant alloys that can resist those environments and indeed the company is seeing a growing demand for such products, states Karan Jain.

Text & images by Alleima

Karan Jain, Renewables Lead for CCS, Alleima

The idea of storing CO2 deep underground in geological formations like depleted oil and gas reservoirs or saline aquifer formations is seen as a viable solution to help decarbonize our environment as the CO2 can be safely stored for a very long time. The oil and gas industry is heavily focused on safety and preventing accidents, and that mindset is also being transferred to carbon storage. So, all the wells being used require field-specific considerations to be able to resist whatever environmental properties exist there.

Corrosion mechanisms

“Storing CO2 underground requires it to be injected as a supercritical fluid at high pressure, and this means that the tubing for the injection must be able to withstand the harsh conditions in which it will operate, both during periods of injection and at steady-state,” says Alleima’s Karan Jain. The process of injecting CO2 to enhance oil recovery is a well-known practice in the oil and gas industry. Alleima has extensive knowledge of corrosion mechanisms involving CO2 with impurities as well as formation environments, often including chlorides and H2S together with low pH and high temperature, and a strong portfolio of manufacturing special alloy tubes that can withstand these corrosive environments. Together with its Alliance partner Tenaris, Alleima received an order for a major CCS project in the first half of 2023.

Well conditions

Noting increasing third-party interest to determine alloy suitability for corrosive conditions, Mr Jain says that Alleima works closely with many of the companies and laboratories conducting testing. “The entire industry is set to grow over the next few years as various CCS projects are poised to materialise and increase the capacity of carbon capture globally. We see possibilities of corrosion-resistant tubing being used when the well conditions are tough.”

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Carbon Capture Editorial Team

Carbon Capture Editorial Team

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