Method and fluid for checking the saturation of a formation in the immediate vicinity of a well
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United States of America Patent
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May 25, 2004
Grant Date -
N/A
app pub date -
Jul 28, 2000
filing date -
Jul 5, 2000
priority date (Note) -
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Abstract
The present invention relates to a method and a fluid for drilling or intervening in a well passing through a porous, permeable formation, wherein a water-based well fluid is circulating in said well. In this method, there is added to the fluid not only the conventional ingredients for such a fluid but also a maximum of 10 wt. % of a composition obtained from a grease or oil and an alcohol, with the chain lengths of the acid and alcohol parts being chosen such that the ester thus obtained has sufficient dispersion in water, compatibility with said ingredients, does not form an emulsion with the reservoir oil, and adsorbs sufficiently on the porous formation.
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