OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2014 - IPC E21B43/20 E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: method lies in drilling of a deposit by vertical and/or directional injection wells and horizontal producing wells with crossed and mutually perpendicular boreholes, pumping of the working fluid through vertical and/or vertical and/or directional injection wells and oil extraction through producing horizontal wells. According to the invention, producing horizontal wells should be longer than 4 times of the distance between the producing and injection wells so that horizontal producing wells open the lower interlayers at the borehole beginning and ending, and the upper interlayers in the borehole middle part. In perpendicular direction horizontal producing wells open the upper interlayers at the borehole beginning and ending, and the lower interlayers in the borehole middle part. At that horizontal producing wells form a mesh with location of 1-3 vertical and/or directional injection wells in the centre of each cell. At that minimum distance between horizontal producing well in vertical plane is equal to 1 m. To cut off point of working fluid breakthrough to horizontal producing wells water-swellable packers are installed.

EFFECT: increasing coverage of the formation by displacement both in thickness and square area, increasing oil recovery of the productive formation and intensifying percent of oil recovery from the reservoir.

1 ex, 3 dwg