Oil-soluble tracer solutions containing gadolinium compounds

Details Oil-soluble tracer solutions containing gadolinium compounds Oil-soluble tracer solutions containing gadolinium compounds

1998-01-19

1999-12-14

Brouillette, D. Gabrielle

Compositions

Nonreactive analytical, testing, or indicating compositions

252517, 252518, 2525211, 252645, 250260, 507905, G01N 3100, H01B 100, H01B 106, C09K 1100, G01V 500

Patent

active

060012803

ABSTRACT:
A tracer solution suitable for use in measuring flow velocities in a borehole, includes: a) a gadolinium salt of a carboxylic acid of general formula ##STR1## where R is an alkyl of not less than four carbon atoms, typically C4 or C5 alkyl, and R.sub.1 and R.sub.2 are hydrogen or an alkyl group, typically hydrogen, methyl or ethyl; b) a free branched-chain carboxylic acid such as an excess of the acid used to form the Gd salt; and c) a non-polar solvent such as hexane or heptane. The Gd content of the solution should be not less than about 50 g/l and is best when it is as high as possible, for example greater than 100 g/l, and the viscosity should be less than 20 cP.

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