METHOD FOR OIL PRODUCTION FROM BED Russian patent published in 2006 - IPC E21B43/22 

FIELD: oil production, particularly oil displacement from bed with the use of displacement agents, namely alkaline solutions.

SUBSTANCE: method involves displacing oil from oil bed to production wells by cyclic injecting still waste liquid and sewage water plugs in still waste liquid/sewage water plug ratio of 0.1-10:1 in dependence of water content in product and of well intake capacity. Still waste liquid/sewage water plug ratio is 5-10:1 when well intake capacity is less than 50 m³/day and water content in treatment site less of than 60%. Still waste liquid/sewage water plug ratio is 3-4:1 when well intake capacity is more than 50 m³/day and water content in treatment site less than 60%. Still waste liquid/sewage water plug ratio is 0.1-1:1 when well intake capacity is less than 50 m³/day and water content in treatment site more than 60%. Still waste liquid/sewage water plug ratio is 1.5-2:1 when well intake capacity is more than 50 m³/day and water content in treatment site more than 60%.

EFFECT: increased efficiency of oil displacement, reduced water content in product and conformance.

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