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

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of producers and injectors, making elements with the injector in the centre and producers around it or selecting drilled wells, determination of the first direction for the maximum primary stress in the stratum δ_max1, performing hydraulic fracturing in producers, injecting water through injectors and extracting the product through producers. At that hydraulic fracturing is performed at first in the wells where displacement front from the injector is parallel to the direction of hydraulic fracturing, thus obtaining fractures in parallel to δ_max1. Water is injected to injection wells with temperature equal to temperature of the stratum t, and the product is extracted through the producers. During the closest winter period water is cooled up to the temperature of (0.5-0.7)t and injected in the respective volume until inflow of cold water is fixed in the remaining wells without performed hydraulic fracturing, change in maximum primary stress of the stratum δ_max2 is determined in the producers without performed hydraulic fracturing in result of cold water injection, hydraulic fracturing is made in the above producers thus obtaining fractures in parallel to δ_max2, thereafter injection of non-cooled water is started.

EFFECT: increasing oil recovery of formations.

2 cl, 1 dwg