| 摘要 |
A method of making a rheology modified aqueous salt solution includes adding thereto, a non-hydratable clay, as defined, and at least one compound capabl e of contributing, in solution, a divalent metal cation and a trivalent metal cation; and then adjusting the pH to a specific range. A dry composition comprising at least one compound capable of contributing the designated cations and, optionally, the non-hydratable clay is also disclosed. This invention is particularly applicable to drilling fluids, and more particulad y to such fluids used in coastal and deepsea drillsites where the presence of salinity has been known to significantly reduce the effectiveness of clays a s thickening agents.
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