Improved electron transfer agents in well acidizing...

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C09K 8/74 (2006.01) C23F 11/04 (2006.01) E21B 41/02 (2006.01)

Patent

CA 2439406

An acidizing composition and a method of acidizing a hydrocarbon bearing subterranean formation in the presence of ferric ions are provided. The acidizing composition includes a strong mineral acid solution, an electron donor agent, a primary electron transfer agent and a secondary electron transfer agent. The primary electron agent is a source of rhenium ions. The secondary electron transfer agent is a source of iodide ion or iodine. The electron donor agent and primary and secondary electron transfer agents function together to reduce ferric ion present in the mineral acid solution to ferrous ion which in turn prevents ferric hydroxide and/or free sulfur from precipitating out of the solution and reduces the formation of sludge in crude oil in the formation. The particular electron transfer agents used in connection with the invention function with virtually all known electron donor agents.

L'invention concerne une composition d'acidification et un procédé d'acidification d'une formation souterraine contenant des hydrocarbures en présence de ions ferriques. Cette composition d'acidification comprend une solution d'acide minéral forte, un agent donneur d'électrons, un agent de transfert d'électrons primaire et un agent de transfert d'électrons secondaire. L'agent de transfert d'électrons primaire est une source d'ions rhénium. L'agent de transfert d'électrons secondaire est une source d'ion iodure ou d'iode. L'agent donneur d'électrons, ainsi que les agents de transfert d'électrons primaire et secondaire fonctionnent ensemble pour réduire un ion ferrique présent dans la solution d'acide minéral en un ion ferreux, ce dernier empêchant à son tour l'hydroxyde ferrique et/ou le soufre libre de précipiter hors de la solution et diminuant la formation de suspension épaisse dans le pétrole brut de la formation. Les agents de transfert d'électrons particuliers utilisés en relation avec cette invention fonctionnent virtuellement avec tous les agents donneurs d'électrons connus.

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