| 摘要 |
A method of reclaiming a well completion brine solution by using an organic chelant that is capable of discriminating between (i) iron and/or non-zinc heavy metals; and (ii) calcium and zinc. The chelant is of the formula: and may be either a neutral compound, a corresponding salt, or a corresponding quaternary salt, wherein: D is F-A (Y<SUP>3</SUP>)<SUB>u</SUB>(Y<SUP>4</SUP>)<SUB>v</SUB>; R is independently selected from C<SUB>p </SUB>or C<SUB>p</SUB>C(O); C<SUB>p </SUB>is a C<SUB>1</SUB>-C<SUB>36 </SUB>hydrocarbyl group, optionally substituted with one or more substituents selected the group consisting of halogen, hydroxyl, sulfate, CH<SUB>2</SUB>CO<SUB>2</SUB>Z or -(CH<SUB>2</SUB>)<SUB>n</SUB>PO(OZ)<SUB>2 </SUB>groups; each A is independently selected from -N and -P; Y<SUP>1 </SUP>is independently selected from J, -[(F)-A(J)]<SUB>w</SUB>Y<SUP>6 </SUP>and R; J, R<SUP>1</SUP>, Y<SUP>2</SUP>, Y<SUP>3</SUP>, Y<SUP>4</SUP>, Y<SUP>5 </SUP>and Y<SUP>6 </SUP>are independently selected from the group consisting of -H, R, -(F)<SUB>n</SUB>CO<SUB>2</SUB>Z and -(CH<SUB>2</SUB>)<SUB>n</SUB>PO(OZ)<SUB>2</SUB>; each F is independently selected from a C<SUB>1</SUB>-C<SUB>12 </SUB>hydrocarbyl group, optionally substituted with one or more substituents selected the group consisting of halogen, hydroxyl, sulfate, CH<SUB>2</SUB>CO<SUB>2</SUB>Z or -(CH<SUB>2</SUB>)<SUB>n</SUB>PO(OZ)<SUB>2 </SUB>groups; Z is -H or a balanced counterion of an alkali or alkaline earth metal or NH<SUB>4</SUB><SUP>+</SUP>; m is 0 to 7; n is 1 to 7; r+s+t is 1 or 2; u+v is 1 or 2; and w is 0 to 7 provided when m is 0, no more than one of R<SUP>1</SUP>, Y<SUP>1</SUP>, Y<SUP>2 </SUP>and Y<SUP>5 </SUP>can be -H.
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