Compressive Strength Changing Law of Oil Well Cement Paste under Corporate Corrosion of HCO3- and SO42-
On the basis of analyzing the oil well cement corrosion mechanism by SO42- and HCO3-, the corrosion products, microstructure and compressive strength of cement stone were measured and the changing regularity and influence factors of compressive strength were analyzed under different experimental conditions. The following conclusions can be drawn. Under the interactive corrosion effect of SO42- and HCO3-, Ca(OH)2 in cement stone was dissolved out and consumed, the calcium silicate hydrate was decomposed, ettringite, gypsum, calcite and thaumasite were produced which destroyed the structure and components of cement stone primary products and led the compressive strength of corrosion cement stone decline. With the increases of ion concentration of corrosive solution, temperature and corrosive time, the compressive strength was decreased gradually, even collapsed completely.
Y. Wang et al., "Compressive Strength Changing Law of Oil Well Cement Paste under Corporate Corrosion of HCO3- and SO42-", Applied Mechanics and Materials, Vols. 229-231, pp. 95-99, 2012