DISPERSANT FOR MUDDY WATER

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PROBLEM TO BE SOLVED : To provide a dispersant for muddy water that gives a sufficient muddy water viscosity to efficiently discharge excavated earth to the ground by means of circulating muddy water, good mud wall-forming properties even at a high temperature and a small permeation amount of muddy water to the direction of a stratum of a drilling surface. SOLUTION : The dispersant for muddy water comprises a polyoxyalkylene-modified vinyl alcohol polymer. The modified vinyl alcohol polymer contains a polyoxyalkylene group in its side chain and has a viscosity-average polymerization degree P of 200-3, 000, a saponification degree of 80-99.99 mol% and a polyoxyalkylene modification amount S of 0.1-10 mol%. COPYRIGHT : (C)2011, JPO&INPIT