| 摘要 |
A fluid loss additive for oil-based well-working fluids, the fluid loss additive comprising the product of mixing in an oil or oil based liquid, (i) lignite or humic acid (ii) (a) an oil soluble or oil dispersible amine or amine salt; (b) an aliphatic amide or hydroxyamide, or a cyclic derivative thereof, containing no primary or secondary amine or amine salt groups; and/or (c) an oil soluble or oil dispersible amine salt containing at least one C1-22alkyl, C2-22alkenyl or C1-22acyl group partially or fully salted with phosphoric acid; and (iii) a dimer and/or trimer fatty acid.
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