E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/22 (2006.01) C09K 8/58 (2006.01) C09K 8/94 (2006.01)
Patent
CA 2327744
A foam drive method for enhancing oil recovery effciency is initiated by injecting into a subterranean oil-bearing formation, an aqueous polymer solution as a preceding-slug. This followed by periodically injecting simultaneously or alternately a non-condensible gas and an aqueous solution of foaming composition to form a combined foam under ground or periodically injecting the combined foam formed beforehand by the gas and said aqueous solution above ground. The aqueous solution of foaming composition comprises an alkali, a surfactant and a polymer. Thereafter, an aqueous polymer solution used as a protecting-slug is injected into the formation; followed by continuing water-flooding.
L'invention concerne un procédé de récupération du pétrole par injection d'une solution aqueuse moussante qui consiste à injecter dans le réservoir renfermant du pétrole une solution aqueuse polymère servant de bouchon avant. On injecte en alternance ou simultanément sur une base périodique un fluide non condensable, une solution aqueuse polymère moussante et renfermant des alcalis, un composé tensioactif et des polymères de manière qu'une mousse se forme dans le sous-sol ou on injecte sur une base périodique ce gaz et la mousse dérivée de ladite solution obtenue sur le sol. On injecte encore une solution aqueuse polymère servant de bouchon protection, puis on injecte de l'eau.
Da Qing Petroleum Administration Bureau
Hill & Schumacher
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