- SULFONATED IMINODIALKANOIC ACIDS FORMED FROM AN IMINODIALKYLNITRILE AND A SULTONE AND METHODS FOR USE THEREOF
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Complexation of metal ions using chelating agents within a subterranean formation can often be desirable, such as to temper the formation of metal-containing precipitates. However, many chelating agents are produced commercially in an alkali metal salt form that may not be entirely suitable for use downhole, particularly in subterranean formations containing a siliceous material. The working pH range of some types of chelating agents may also be limiting. Treatment fluids comprising an aqueous carrier fluid having an acidic pH, a sulfonated iminodialkanoic acid, and ammonium ions may at least partially address downhole precipitation issues, while providing further advantages as well. Methods for forming sulfonated iminodialkanoic acids can comprise reacting an iminodialkylnitrile with a sultone under acidic conditions to form a fluid comprising a sulfonated iminodialkanoic acid and ammonium ions.
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Paragraph 0096
(2018/02/03)
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- METHODS AND SYSTEMS EMPLOYING A SULFONATED IMINODIACETIC ACID DURING SUBTERRANEAN TREATMENT OPERATIONS
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In a subterranean formation, complexation of metal ions can often be desirable in order to mitigate reactivity of the metal ions. However, many chelating agents used for this purpose are commercially manufactured in an alkali metal salt form that may not be entirely suitable for use downhole. The working pH range of some types of chelating agents may also be limiting. Accordingly, methods for treating a subterranean formation can comprise: providing an acidic treatment fluid comprising a sulfonated iminodiacetic acid; introducing the acidic treatment fluid into a subterranean formation; and at least partially dissolving an acid-reactive substance in the subterranean formation while complexing one or more metal ions with the sulfonated iminodiacetic acid.
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Paragraph 0102
(2018/03/09)
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- LOW PH METAL-FREE PREPARATION OF AMINATED ORGANIC ACID
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The invention provides a process for making compounds according to Formula I: where R1, R1a, R2, R2a, R3 and R3a are defined as set forth in the specification. Formula I compounds are useful as chelants and stabilizers of cations in aqueous media and the invention therefore provides a method for using the compounds in the treatment of subterranean formations, such as in acidizing operations.
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Paragraph 0147; 0148
(2016/09/12)
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