COMPOSITION OF ION-MODIFIED WATER FOR INCREASING RESERVOIR RECOVERY Russian patent published in 2017 - IPC C09K8/58 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular to compositions for increasing reservoir recovery, laid with carbonate reservoirs with hydrophobic or with mixed wetting ability. Composition provides higher oil recovery factor due to increase in efficiency of oil displacement and larger coverage of reservoir at flooding of carbonate deposits with hydrophobic or mixed wetting ability. Present invention comprises preparation of ion-modified water with a specific detailed ion composition, ensuring maximum change in rock wettability towards hydrophilization, that eventually leads to extraction of additional oil due to increase in displacement and coverage factors. Composition of ion-modified water for increasing reservoir recovery includes hydrocarbonate, sulphate, chlorine, calcium, magnesium, sodium, potassium ions. Disclosed composition of ion-modified water has following advantages: simple and easy to manufacture (slightly differs from reservoir-pressure maintenance with water of arbitrary composition), considerably cheaper surfactant, provides considerable increase in K_vyt and change in wettability.

EFFECT: use of present composition enables to mobilise and displace additional oil volume and increase oil recovery factor.

1 cl, 4 tbl, 3 dwg