A method for forming a fluid storage reservoir in a permeable formation limited by a relatively impermeable layer extending horizontally, comprising: to. displacing a barrier fluid through the permeable formation around a well bore that traverses at least a portion of the permeable formation; b. establishing said barrier fluid as a vertically extending continuous wall of closed periphery located around the perforation in a position in which it contacts said relatively impermeable layer and spaced from said perforation; Y, c. maintain said wall in said position. (Machine-translation by Google Translate, not legally binding)
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