| 摘要 |
A new class of sulfur scavenging or convening compositions is disclosed comprising diamine terminated, amine-aldehyde adducts, where the adducts are substantially bimolecular amine-aldehyde adducts and the composition is substantially free of trimer and/or triazines. These are prepared by contacting at least one aldehyde with at least one primary amine under conditions to form a reaction product comprising substantially bimolecular adducts of the amines and the aldehydes having substantially no trimer or triazine adducts; and contacting the reaction product with at least one diamine. Preferred products are of formula (I): <EMI ID=1.1 HE=32 WI=102 LX=667 LY=1402 TI=CF> <PC>where R is an alkenyl group, cycloalkenyl or arenyl group having between about 1 and about 20 carbon atoms, where one or more, of the carbon atoms can be (i) oxygen atoms in the form of carboxy, hydroxy and/or ether moieties and/or (ii) nitrogen atoms in the form of tertiary amine or amide moieties; R' and R'' are the same or different carbon-containing groups having between about 1 and about 20 carbon atoms, where one or more of the carbon atoms can be (i) oxygen atoms in the form of carboxy, hydroxy and/or ether moieties or (ii) nitrogen atoms in the form of tertiary amine or amide moieties; and where k, l, m and n are integers having a value between 0 and 2, provided that at least one has a value of 1 or 2. A plot (figure 1) of weekly average water production (M<3>/day) versus production week shows the beneficial effect of using such a composition after optimization, adjusting amount based on noxious sulfur content, and after multi-point injection of the composition into well fluids. Noxious sulfur species, such as hydrogen sulfide and thiols, which are present in industrial and waste management environments such as oil and gas production, refining, chemical processing and manufacturing, coal gasification and sewage treatment can thus be removed.
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