| 摘要 |
Subterranean zones penetrated by a well bore, wherein the static temperatures are as high as 400 DEG F (205 DEG C) or greater, are contacted with an aqueous treating fluid basically comprised of an aqueous liquid containing one or more inorganic monovalent salts, multivalent salts or both, in an amount no greater than 5% by weight of said aqueous liquid, and one or more synthetic hectorite clay gelling and thixotropy imparting agents selected from a synthetic hectorite clay having the composition by weight on a dry basis of 59.5% SiO2, 27.5% MgO, 0.8% Li2O and 2.8% Na2O, a synthetic hectorite clay having the composition by weight on a dry basis of 54.5% SiO2, 26.0% MgO, 0.8% Li2O, 5.6% Na2O and 4.1% P2O5 and a synthetic hectorite clay having the composition by weight on a dry basis of 54.5% SiO2, 26.0% MgO, 0.8% LiO2, 5.6% Na2O, 4.1% P2O5 and also containing inorganic polyphosphate peptizers.
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