To overcome the difficulty of losing the surface activity of the surfactants above 50,000 ppm salt which of the following is required?

To overcome the difficulty of losing the surface activity of the surfactants above 50,000 ppm salt which of the following is required? Correct Answer Pre-flush of low saline water

To overcome the difficulty of losing of the surface activity of the surfactants above 50,000 ppm salt, Pre-flush of low saline water e.g. 1% KCl is used which is seemed to be very useful in well treatments.
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