CaCO 3 scaling tendency can differ over seawater flood life

Krishnam U. Raju Saudi Aramco Dhahran Seawater can reduce the likelihood of scaling caused by a formation brine that has a high calcium carbonate (CaCO3) scaling potential. Seawater is often injected into reservoirs for pressure maintenance and enhancing oil recovery. Commingled with formation brine, the seawater lessens the CaCO3 scaling potential of the mixture. As the percentage of seawater in the mixture increases, scaling potential decreases and may even become negative. Once the scaling potential becomes negative, the produced water can dissolve CaCO3 scale that may have formed in the flow lines. Therefore, a well that might have required squeezing with...

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