Injectivity impairment due to sulfate scaling during PWRI: analytical model

P. Bedrikovetsky, Eric James Mackay, R. P. Monteiro, F. Patricio, F. F. Rosario

Research output: Contribution to conferencePaperpeer-review

19 Citations (Scopus)


Previous work has derived an analytical model for simultaneous flow of incompatible waters in porous media with sulphate salt precipitation, determined typical values of kinetics reaction coefficient from corefloods and what the impact would be on productivity impairment during sulphate scaling. This paper extends the previous work, by modelling the injectivity impairment during simultaneous injection of incompatible waters, i.e. cation-rich produced water (PWRI) and seawater with sulphate anions. An analytical model with explicit expressions for deposited concentration and injectivity decline was developed. The location of scale deposition and the resulting injectivity impairment are calculated for a range of sensitivities, including reaction kinetics (ranging from minimum to maximum values as obtained from coreflood and field data), fraction of produced water in the injected mixture and barium concentration in produced/re-injected water. The theoretical parameter of the size of formation-damaged zone was introduced. It was found out that almost all deposition takes place in 2-4 well radii neighbourhood. Calculations show that simultaneous injection of seawater with produced water containing even decimal fractions of ppm of barium would results in significant injectivity decline.

Original languageEnglish
Number of pages15
Publication statusPublished - May 2006
Event8th SPE International Oilfield Scale Symposium 2006 - Aberdeen, United Kingdom
Duration: 31 May 20061 Jun 2006


Conference8th SPE International Oilfield Scale Symposium 2006
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • General Engineering


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