DEVELOPMENT METHOD OF OIL DEPOSIT WITH HORIZONTAL WELLS Russian patent published in 2014 - IPC E21B43/20 E21B43/30 E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling and infrastructure development of horizontal producers and injectors crossed in the structure plan, placement of horizontal injectors in the structure plan lower than horizontal producers, perforation of the wells in the productive part with different density, injection of the working fluid to injectors and extraction of the product through producers. According to the invention horizontal wells are placed in parallel to the deposit length and width. At that entry to the productive stratum of producers is placed along one side of the deposit while entry of injectors is placed along the other side perpendicular to the first one. Density of perforated holes at each section of the horizontal wells formed by crossing of producers and injectors in the structure plan is minimum at the cross points and it is increased towards the centre of each section. At the initial stage of development fresh water or water with suspended matters concentration not less than 50mg/l is injected till water cut is decreased in the well. Thereafter stratal or waste waters are injected. Perforation density at the cross points in increased towards the centre of each section on the basis of analytical state considering the well hydrodynamic efficiency against the nature of the horizontal hole opening, distance from the perforated interval up to the horizontal hole of the adjacent well and in-place permeability in the respective perforation interval.

EFFECT: increasing oil recovery factor of the productive stratum and reducing water cut rate of the product in producers.

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