02214nab a2200205 4500 20260522142146.0 260224s2009 xxu Bedrikovetsky, Pavel 42588 Silva, Raphael M.P. 42579 Daher, José S. 42589 Well-data-based prediction of productivity decline due to sulphate scaling Sept. 2009 14/06/2010 ; 11/06/2010 11 p. ; 60-70 Transcripción del resumen del autor. Sulphate scaling can have a disastrous impact on oil production in waterflood projects with incompatible injected and formation waters. This is due to precipitation of barium/strontium sulphate from the mixture of both waters and the consequent permeability reduction resulting in loss of well productivity. The system where sulphate scaling damage occurs is determined by two governing parameters: the kinetics coefficient characterising the velocity of chemical reaction and the formation damage coefficient reflecting permeability decrease due to salt precipitation. Previous work has derived an analytical model-based method for determination of two coefficients from laboratory corefloods during quasi-steady state commingled flow of injected and formation waters. The current study extends the method for determination of kinetics and formation damage coefficients from production well data consisting of barium concentrations in the produced water and of well productivity decline. We analyse production data for five wells from giant offshore field A, submitted to seawater flooding (Campos Basin, Brazil), and obtain values of the two sulphate scaling damage parameters. The two coefficient values were used for prediction of productivity decline for these wells. The values of kinetics and formation damage coefficients as obtained from either laboratory or field data vary in the same range intervals. These results validate the proposed mathematical model for sulphate scaling damage and the analytical model-based method "from lab and wells to wells". 1-2 Journal of Petroleum Science & Engineering 68 ARTICULO ddc 170946 170946 0 0 0 0 238765 BAAB BAAB 2026-03-05 200045803 0 200045803 2026-03-05 15:13:19 2026-03-05 ARTICULO