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PLUGGING THIEF ZONES AND FRACTURES BY IN-SITU AND IN-DEPTH CRYSTALLIZATION FOR IMPROVING WATER SWEEP EFFICIENCY OF SANDSTONE AND CARBONATE RESERVOIRS
PLUGGING THIEF ZONES AND FRACTURES BY IN-SITU AND IN-DEPTH CRYSTALLIZATION FOR IMPROVING WATER SWEEP EFFICIENCY OF SANDSTONE AND CARBONATE RESERVOIRS
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机译:通过原位和深度结晶将大地带和裂缝堵塞,以提高砂岩和碳酸盐储层的水扫除效率
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摘要
The present invention relates to methods and compositions that can be used to delay crystallization of a treatment solution so that thief zones or fractures are plugged in subterranean formations at a substantial distance from a wellbore. A supersaturated sodium aluminate solution, or other solutions, are introduced into the reservoir. The solution is relatively stable in the supersaturated state. Crystallization, or de-stabilizing the solution, can be controlled, which in turn plugs the thief zone or fracture at a designed point of time. By controlling the time that crystallization starts, i.e., the induction period, thief zones that are located at a substantial distant from the wellbore can be plugged.
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