FIELD: oil and gas industry.
SUBSTANCE: method is carried out by a cyclic increase and decrease in working substance injection pressure in injection wells. Low-mineralized water is used as a working substance. Injection well is placed in the center. Production wells are arranged around this well. Allowed range of oil-saturated reservoir permeability at the source area is not less than 30%. Low-mineralized water is taken from surface watercourses: rivers, lakes and seas. Water is pre-decontaminated and pre-filtered to suspended solids size less than 0.1 of average reservoir pore size with minimum permeability. Water injection to the injection well is started with a gradual increase in consumption from zero to the value at which injection pressure is (0.7-0.8)*Prock where Prock is vertical rock pressure of overlying rocks. Consumption is then reduced to the value at which injection pressure is (0.1-0.2)⋅Prock. Cycles of increasing/decreasing of low-mineralized water consumption are repeated many times. Consumption increasing and decreasing speed is set equal at the range of 2-50 m3/day per one injection well. Bhp value relation in source production wells is set inversely proportional to their reservoir permeability-formation thickness product.
EFFECT: increased oil recovery of zone-heterogeneous oil reservoirs.
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Authors
Dates
2017-04-12—Published
2016-06-19—Filed