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Short circuiting between producers and injectors continues to challenge operators. A unique water-swelling polymer (WSP) system<br>was developed and extensively tested in the laboratory. This polymer has the ability to absorb 30 to 400 times its weight in water and<br>therefore can plug off high-permeability features or fractures. Because of the size of this material, it cannot penetrate most matrix<br>systems. Another potential application could be the control of lost circulation whilst drilling.