| 摘要 |
A drilling fluid containing an aqueous phase and an oil phase and an ether carboxylic acid of the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>RO(CH<SUB>2</SUB>CH<SUB>2</SUB>O)<SUB>x</SUB>(CH<SUB>2</SUB>CHR<SUP>1</SUP>O)<SUB>y</SUB>CH<SUB>2</SUB>-COOX <?in-line-formulae description="In-line Formulae" end="tail"?> wherein, R is a saturated or unsaturated, branched or unbranched alkyl or alkenyl group containing 6 to 22 carbon atoms, x is a number from 1 to 20 and y is 0 or a number from 1 to 20, provided that the sum of x and y is at least 1 and at most 25, R<SUP>1 </SUP>is an alkyl group containing 1 to 4 carbon atoms and X comprises at least one member selected from the group consisting of a hydrogen atom, monovalent anions and polyvalent anions.
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