DEVELOPMENT METHOD OF WET CARBONATE FORMATION Russian patent published in 2013 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: development method of wet oil formation includes pumping of water-shutoff agent to wet formation of a production well; pumping of nonionic surfactant through injection well and oil withdrawal through a production well. In process of the method implementation premixed solution of water-shutoff agent is made of 8-15% solution of polyaluminium chloride with pH=3.5-5 based on 0.05% water solution of acrylamide polymer DP9-8177; the solution is pumped into production well in volume equal to 0.1 of pore volume for the most permeable interlayer and thereafter the well is hold within 24-36 hours. Then solution of nonionic surfactant is pumped through injection well, the well is shut off for process suspension for the period of 24-72 hours and oil is withheld through production well.

EFFECT: increase of efficiency for development of wet carbonate formation due to prolongation of water-shutoff capacity and increase of oil flow rate in wet strata notwithstanding salt content of stratal waters.

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