| 摘要 |
<p>An effective defoamer composition for water based drilling muds comprises a generally uniform, particulate mixture of from 1 to 50% by weight of an aliphatic alcohol having from 8 to 32 carbon atoms, and from 99 to 50% by weight of a solid carrier material which is generally non-swelling in aqueous media, which can be formed into particles having an average size of less than 150 micrometers, and which at least partially adsorbs said alcohol.</p> |
