METHOD OF OIL POOL DEVELOPMENT BY HORIZONTAL WELLS WITH MULTIPLE HYDRAULIC FRACTURING Russian patent published in 2014 - IPC E21B43/20 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of horizontal producers and injectors with parallel horizontal boreholes or selecting drilled wells, determination of the first direction for the maximum primary stress in the stratum δ_max1, performing multiple hydraulic fracturing in horizontal boreholes of producers and injectors, injecting water through horizontal injectors and extracting the product through horizontal producers. At that at first multiple hydraulic fracturing is made in horizontal boreholes of the producers thus obtaining fractures in parallel to δ_max1, water injection is made to horizontal injectors with temperature t equal to the current temperature of the stratum t, while the product is extracted through the horizontal producers. During the closest winter period water is cooled till temperature of (0.5-0.7) t and injected in the volume to be calculated as per the suggested formula, change in the maximum primary stress of the stratum δ_max2 is recorded for bottomhole zone of the injector in result of cold water injection, multiple hydraulic fracturing is made in the horizontal borehole of the injector thus obtaining fractures in parallel to δ_max2, thereupon injection of non-cooled water is started.

EFFECT: increasing oil recovery of the productive stratum.

1 dwg