The present invention provides a method for increasing the retention of a scale inhibitor within a hydrocarbon producing system (e.g. a subterranean formation), said method comprising contacting said system with a polymer formed from a diallyl ammonium salt and with said scale inhibitor, wherein sai
The present invention provides a method for increasing the retention of a scale inhibitor within a hydrocarbon producing system (e.g. a subterranean formation), said method comprising contacting said system with a polymer formed from a diallyl ammonium salt and with said scale inhibitor, wherein said polymer formed from a diallyl ammonium salt has a molecular weight of greater than 50,000 (e.g. a molecular weight of 55,000 to 2,000,000).
대표청구항▼
1. A method for increasing the retention of a scale inhibitor within a hydrocarbon producing system, said method comprising contacting said system with a polymer formed from a diallyl ammonium salt and with said scale inhibitor, wherein said polymer formed from a diallyl ammonium salt has a molecula
1. A method for increasing the retention of a scale inhibitor within a hydrocarbon producing system, said method comprising contacting said system with a polymer formed from a diallyl ammonium salt and with said scale inhibitor, wherein said polymer formed from a diallyl ammonium salt has a molecular weight of greater than 50,000. 2. A method as claimed in claim 1, wherein said scale inhibitor is polymeric. 3. A method as claimed in claim 2, wherein said scale inhibitor is formed from monomers of formula (IV): whereinR3 is —CO2Z, —SO3Z, —PO3Z2 or an alkyl or aryl group substituted with at least one —CO2Z, —SO3Z or —PO3Z2 group in which Z is a hydrogen atom or a univalent metal atom;R4, R5 and R6 are each independently hydrogen, an optionally substituted alkyl or aryl group having from 1 to 6 carbon atoms or a group R3 as hereinbefore defined. 4. A method as claimed in claim 1, wherein said method comprises squeeze treating said system by introducing said polymer formed from a diallyl ammonium salt and said scale inhibitor into said system and shutting them in a well for at least 1 hour prior to putting the well back into production. 5. A method as claimed in claim 1, wherein said polymer is formed from monomers of formula (I): whereinR1 and R2 are each independently hydrogen or substituted organic radicals having from 1 to 20 carbon atoms,each R is independently selected from hydrogen and organic radicals having from 1 to 20 carbon atoms; andX is a counterion which may optionally be covalently bonded to either R1 or R2 . 6. A method as claimed in claim 1, wherein said polymer is a homopolymer formed from diallyl dimethyl ammonium chloride. 7. A method as claimed in claim 1, wherein said scale inhibitor comprises at least one anionic group. 8. A method as claimed in claim 1 , wherein said polymer is applied as a dispersion or solution in a liquid carrier. 9. A method as claimed in claim 1, wherein said scale inhibitor is applied as a dispersion or solution in a liquid carrier. 10. A method as claimed in claim 1, wherein said polymer and said scale inhibitor form a solid within the hydrocarbon producing system. 11. A method as claimed in claim 1, wherein said polymer is applied as a solution having a pH of 1 to 6. 12. A method as claimed in claim 1, wherein said scale inhibitor is applied as a solution having a pH of 1 to 3. 13. A method as claimed in claim 1, wherein said polymer formed from a diallyl ammonium salt has a molecular weight of between 55,000 to 2,000,000. 14. A method as claimed in claim 1, wherein said scale inhibitor comprises at least one carboxylate group. 15. A hydrocarbon well treatment composition comprising: a carrier liquid;a homopolymer formed from a diallyl ammonium salt having a molecular weight of greater than 50,000, wherein the concentration of said homopolymer is 1 to 10 wt%; anda scale inhibitor. 16. A composition as claimed in claim 15, wherein said polymer formed from a diallyl ammonium salt has a molecular weight of between 55,000 to 2,000,000. 17. A kit for increasing the retention of a scale inhibitor within a hydrocarbon producing system, said kit comprising: a polymer formed from diallyl ammonium salt having a molecular weight of greater than 50,000; andseparately from the polymer a scale inhibitor. 18. A kit as claimed in claim 17, wherein said polymer formed from a diallyl ammonium salt has a molecular weight of between 55,000 to 2,000,000.
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