Evaluation of resistance to high CO2 partial pressure corrosion of a new material cementing cement stone
The high temperature and concentration of CO2 underground conditions shorten the long-term sealing cycle life of the cement sheath,making it more difficult to ensure the integrity of the cement sheath.Due to the supercritical characteristics of low viscosity,high diffusion,and high compressibility of CO2 under high pressure environments,it will exacer-bate the corrosion of the cement stone.This article has developed a new type of anti-corro-sion material that can be used in high-temperature and high CO2 partial pressure environ-ments underground by comparing its anti-corrosion performance with six common anti-cor-rosion materials.The experimental results show that the new volcanic ash mixture material increases the long-term strength of cement stone due to the consumption of Ca(OH)2 in the sec-ondary hydration reaction.Microscopic analysis shows that the anti-corrosion cement stone structure is more dense,and after corrosion,there is still calcium silicate composition on the outside,and corrosion remains on the surface.The cement stone of the new volcanic ash mixture material has better CO2 corrosion resistance with a 30 day decay depth of 1.17 mm,a compressive strength decline rate of 2.6%,and a permeability change rate of 2.1%,and has good comprehensive construction performance.
high CO2 partial pressureCO2 corrosion resistancenew volcanic ash mixture materialshigh temperature and high pressure corrosion test
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