Low dosage naphthenate inhibitors

E - Fixed Constructions – 21 – B

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E21B 37/06 (2006.01)

Patent

CA 2566563

Low dosage naphthenate inhibitors, such as a surfactant or hydrotrope, delivered into production fluids for contact with mixtures of oil and water, such as in a hydrocarbon producing formation, production equipment, or processing sytems. Inhibitor compounds such as monophosphate esters and diphosphate esters exhibit surface-active properties that cause the inhibitors to self-associate at oil-water interfaces and inhibit interactions between organic acids in the oil with cations or cation complexes in water. These compounds also inhibit aggregation of organic acid carboxylate salts that form when pH and pressure conditions are amenable to organic acid ionization. Preferred inhibitors do not form emulsions due to the formation of unstable mixed interface structures that result in coalescence of dispersed droplets. Naphthenate inhibitor compound dosages of less than 100 ppm can effectively inhibit naphthenate salts or other organic acid salts that can form precipitates or emulsions during crude oil production or processing.

L'invention concerne des inhibiteurs de naphténate à faible dosage, tels qu'un tensioactif ou un hydrotrope, introduits dans des fluides de production prévus pour entrer en contact avec des mélanges d'huile et d'eau, p. ex. dans une formation produisant des hydrocarbures, un équipement de production ou des systèmes de traitement. Des composés inhibiteurs, tels que des esters monophosphoriques et diphosphoriques, possèdent des propriétés tensioactives amenant ces inhibiteurs à s'associer au niveau d'interfaces huile-eau et inhibent des interactions entre des acides organiques dans l'huile et des cations ou complexes cationiques dans l'eau. Ces composés inhibent également l'agrégation de sels de carboxylates d'acides organiques qui se forment lorsque des conditions de pH et de pression se prêtent à l'ionisation des acides organiques. Des inhibiteurs préférés ne forment pas d'émulsions grâce à la formation de structures d'interfaces mixtes instables qui entraînent la coalescence de gouttelettes dispersées. Des dosages de composés inhibiteurs de naphténate inférieurs à 100 ppm peuvent inhiber efficacement des sels de naphténate ou d'autres sels d'acides organiques pouvant former des précipités ou des émulsions pendant la production ou le traitement du pétrole brut.

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