DEVELOPMENT OF OIL DEPOSIT BY MULTIHOLE HORIZONTAL WELLS Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises extraction of oil via production wells, injection of formation water via injection wells. In compliance with this invention, technologies are used at drilling that allow opening and closing of every borehole. This allows definition of watered horizontal borehole. Developed borehole core sample is subjected to lab analysis. Said core sample is, first, dewatered to define swelling capacity of clay components in sweet water and plugging of seam pores with solid suspended particles. At open watered borehole and other closed boreholes, sweet water in injected to the well at mineralization of 1.5 g/l and content of solid suspended particles of not over 40 mg/l in amount equal to 1-10% of threshold space of well bottom zone of said borehole. Holding if performed for time interval sufficient for swelling of clay components of the pod. Then, water is injected with content of solid suspended particles of 70-200 mg/l taken from well products to decrease the capacity twofold of initial value. Injection is terminated to start operation of the well.

EFFECT: decreased watering, higher oil yield.

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