| 摘要 |
An aqueous drilling fluid for use in drilling through reactive clays and shales and other soft formations e.g. chalk, contains in addition to typical polymeric agents for fluid loss control and rheological control, a stabiliser consisting essentially of a range of exclusively potassium silicates i.e. containing silica and potassium oxide in various ratios, but no bentonite or barite or other solids weighting material and is free of brine solutions commonly used in prior art drilling fluids.
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