Use of long chain amines and difunctional compounds as tracers
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United States of America Patent
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Mar 29, 2016
Grant Date -
Dec 31, 2015
app pub date -
Dec 11, 2014
filing date -
Jun 27, 2014
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Abstract
Non-halogenated molecules including, but are not necessarily limited, to alkyl and aromatic amines having from 8 to 18 carbon atoms and salts of these amines, diols having the formula HO—(CH2)n—OH, diamines having the formula H2N—(CH2)n—NH2, dicarboxylic acids having the formula HO.CO—(CH2)n—CO.OH, diesters having the formula R′O.CO—(CH2)n—CO.OR″, where n is 4 to 18, and R′ and R″ are independently straight or branched alkyl or aromatic groups of 1-20 carbon atoms, and combinations thereof are used as tracers to measure oil and/or water fluid returns, e.g. from a hydraulic fracturing job. The non-halogenated molecules may be combined with substrates and introduced into a subterranean location, desorbed and recovered from the subterranean location with a fluid, reacted with a reagent to give a derivatized tracer. The presence of the derivatized tracer is then detected in the recovered fluid. Different non-halogenated tracers may be used for each hydraulic fracturing stage.
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