| 摘要 |
Drilling, completing or workover of a well, particularly an oil and/or gas well, is carried out using a fluid which includes a continuous phase including an ester of the formula (I): (R<SUP>2</SUP>)<SUB>p</SUB>-Ph-(CH<SUB>2</SUB>)<SUB>m</SUB>-COO-(AO)<SUB>n</SUB>-R<SUP>1 </SUP>where R<SUP>1</SUP>, AO, n, m, Ph, R<SUP>2 </SUP>and p have defined meanings and particularly where the esters are alkyl or alkenyl benzoate esters. These esters are beneficial by having a range of viscosities, especially extending to low viscosities, and attractive toxicological and environmental profiles for use in drilling, completion and/or workover of wells.
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