| 摘要 |
Mixture of biodegradable and non-bacteriologically contaminating chemical products which make it possible to keep drill holes open during production and excavation operations. The invention relates to a product which slowly degrades while removing both risks of blocking and of bacterial contamination. This product consists of three different chemical products: 1 a biodegradable polysaccharide in an insufficient concentration to make possible contaminating bacterial proliferation; 2 a high-viscosity carboxymethyl cellulose sensitive to bacterial wastes produced by degradation of the polysaccharide; 3 a long-chain polyacrylamide used as a suspension agent. The final product is intended for carrying out production drillings or for studying aquiferous nappes.
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