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公开(公告)号：EP0812307B1
公开(公告)日：1998-12-30
申请号：EP96919194.9
申请日：1996-06-06
发明人： COLLE, Karla, S. , OELFKE, Russell, H. , COSTELLO, Christine, A. , TALLEY, Larry, D. , BERLUCHE, Enock
CPC分类号： F17D1/05 , C09K2208/22 , C10L3/10 , Y02E60/34
摘要： Clathrate hydrate formation in petroleum fluid streams is inhibited by adding water soluble polymers having N-vinyl amide or N-allyl amide units to the streams. Each N-vinyl amide and N-allyl amide unit has two substituent groups, R1 and R2, substituted on the nitrogen where R1 is a hydrogen or hydrocarbon group having one to six carbon atoms and zero to two heteroatoms selected from the group consisting of oxygen, nitrogen, and combinations thereof, where R2 is a hydrocarbon group having one to six carbon atoms and zero to two heteroatoms selected from the group consisting of oxygen, nitrogen, and combinations thereof, and where the sum total of carbon atoms in R1 and R2 is greater than or equal to one, but less than eight. Some preferred examples of such polymers include copolymers of N-vinyl amides and substituted acrylamides. Specific examples of such copolymers include, N-methyl-N-vinylacetamide (VIMA) copolymerized with acryloylpyrrolidine (APYD) or acryloylpiperidine (APID) and more preferably, VIMA copolymerized with N-substituted methacrylamides such as N-isopropylmethacrylamide (iPMAM) and methacryloylpyrrolidine (MAPYD).
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公开(公告)号：EP0850209A1
公开(公告)日：1998-07-01
申请号：EP96918449.0
申请日：1996-06-07
发明人： COLLE, Karla, S. , COSTELLO, Christine, A. , TALLEY, Larry, D. , OELFKE, Russell, H. , BERLUCHE, Enock
CPC分类号： F17D1/05 , C09K8/52 , C09K2208/22 , C10L3/10
摘要： A method for inhibiting the formation of clathrate hydrates in a fluid having hydrate-forming constituents involves treating the fluid with an inhibitor comprising a substantially water soluble polymer having a polymer backbone with a pendant C1-C3 alkyl group; the polymer having an average molecular weight between about 1,000 and about 6,000,000. Preferably, the pendant alkyl group is a methyl group. The rate of nucleation, growth, and/or agglomeration of gas hydrate crystals in a petroleum fluid stream is reduced using the alkylated polymer backbone inhibitor, thereby inhibiting the formation of a hydrate blockage in the pipe conveying the petroleum fluid stream. Test results are disclosed which unexpectedly show that alkylating the polymer backbone with a methyl group will produce a subcooling for the alkylated polymer that is at least about 2 °F (about 1.1 °C) greater than its nonalkylated counterpart. The inhibitor can be used conveniently at low concentrations, for example in the range of from about 0.01 % to about 5 % by weight of the water present in the oil or gas stream, to effectively treat a petroleum fluid having a water phase.
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公开(公告)号：EP0812307A1
公开(公告)日：1997-12-17
申请号：EP96919194.0
申请日：1996-06-06
发明人： COLLE, Karla, S. , OELFKE, Russell, H. , COSTELLO, Christine, A. , TALLEY, Larry, D. , BERLUCHE, Enock
CPC分类号： F17D1/05 , C09K2208/22 , C10L3/10 , Y02E60/34
摘要： Clathrate hydrate formation in petroleum fluid streams is inhibited by adding water soluble polymers having N-vinyl amide or N-allyl amide units to the streams. Each N-vinyl amide and N-allyl amide unit has two substituent groups, R1 and R2, substituted on the nitrogen where R1 is a hydrogen or hydrocarbon group having one to six carbon atoms and zero to two heteroatoms selected from the group consisting of oxygen, nitrogen, and combinations thereof, where R2 is a hydrocarbon group having one to six carbon atoms and zero to two heteroatoms selected from the group consisting of oxygen, nitrogen, and combinations thereof, and where the sum total of carbon atoms in R1 and R2 is greater than or equal to one, but less than eight. Some preferred examples of such polymers include copolymers of N-vinyl amides and substituted acrylamides. Specific examples of such copolymers include, N-methyl-N-vinylacetamide (VIMA) copolymerized with acryloylpyrrolidine (APYD) or acryloylpiperidine (APID) and more preferably, VIMA copolymerized with N-substituted methacrylamides such as N-isopropylmethacrylamide (iPMAM) and methacryloylpyrrolidine (MAPYD).
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