| 摘要 |
<p>Hydroxyethyl cellulose can function as a fluid loss additive containing 16 to 20% by weight of zinc bromide and either or both of calcium chloride and calcium bromide. When the concentration (X) of zinc bromide exceeds 20% by weight, both calcium chloride and calcium bromide must be present, the concentration of calcium chloride being at least (2X-33)% by weight.</p> |
