DEVELOPMENT METHOD FOR OIL DEPOSIT WITH CLAY RESERVOIR Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil industry, particularly enhanced recovery methods for obtaining hydrocarbons and formation pressure maintenance.

SUBSTANCE: method involves withdrawing mineralized formation water through at least one water-intake well provided with electric-centrifugal pump; supplying mineralized formation water via pipelines to at least one injection well; injecting mineralized formation water in at least one injection well and producing oil through production wells. Injection well is provided with electric-centrifugal or screw pump so that pump output is located in injection well. Electric-centrifugal pump arranged in water intake well and electric-centrifugal or screw pump located in injection well are chosen so that the pumps have equal capacities. Electric-centrifugal or screw pump located in injection well has head exceeding that of water intake well. Mineralized formation water is injected in injection well through flow string when hole annuity is packed.

EFFECT: increased efficiency of cross-well formation water transfer to productive formation with clay reservoir and, as a result, increased oil recovery from formation.

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