Prediction of CO2 Corrosion of Cement Paste Based on Solid Calcium Content

doi:10.11885/j.issn.16745086.2021.04.29.03

Abstract

Abstract: CO₂ will corrode the cement sheath of oil well, leading to its strength decline, make it lose the function of protecting casing and sealing off oil, gas and water. Thus shorten the life of oil and gas well and cause huge economic loss. If the corrosion depth and corrosion laws of CO₂ downhole can be predicted, the life of the oil well can be predicted, and the corrosion resistance of the cement ring can be improved. However, most of the current CO₂ corrosion depth models are semi empirical models based on experimental data fitting, which are not universally applicable. To solve this problem, a prediction model of CO₂ corrosion depth was established based on the law of mass conservation, diffusion convection equation and calcium precipitation rate. The model takes into account many factors, especially the diffusion of CO₂ and the precipitation of calcium ions, so it has strong applicability. The reliability of the model is verified by CO₂ corrosion test, and the change law of cement matrix change after corrosion is analyzed by using the model. The results show that with the increase of corrosion time, the porosity and permeability of cement sheath increase, and the tortuosity decreases, which leads to the acceleration of material convection diffusion and corrosion rate; the closer to the corrosion end, the greater the porosity and permeability, and the smaller the tortuosity.

Key words: oil well cement, CO₂, calcium ion, corrosion depth, prediction model

CLC Number:

TE21

YUAN Bin, YUAN Kunfeng, XU Bihua, YAN Shuang. Prediction of CO₂ Corrosion of Cement Paste Based on Solid Calcium Content[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 191-198.

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Prediction of CO₂ Corrosion of Cement Paste Based on Solid Calcium Content

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