Plugging thief zones and fractures by in-situ and in-depth crystallization for improving water sweep efficiency of sandstone and carbonate reservoirs

摘要: The present invention relates to methods and compositions that can be used delay crystallization of a treatment solution so thief zones or fractures are plugged in subterranean formations at substantial distance from wellbore. A supersaturated sodium aluminate solution, other solutions, introduced into the reservoir. is relatively stable state. Crystallization, de-stabilizing controlled, which turn plugs zone fracture designed point time. By controlling time starts, i.e., induction period, located distant wellbore plugged.