DEVELOPMENT OF LOW-PERMEABILITY OIL DEPOSITS BY HORIZONTAL WELLS UNDER NATURAL CONDITIONS Russian patent published in 2014 - IPC E21B43/16 E21B43/26 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of parallel production and injection horizontal wells combined with multiple hydraulic fracturing of the seam. Note here that at least one production well is drilled in beds with permeability not over 2 mD. First, one horizontal well is drilled with angle between maximum major strain of the bed and direction of borehole making 30-60 degrees. Multiple hydrofrac is realised thereat. Well is put in operation. If bed pressure decreases by not over 3% a year then further development is performed under natural conditions with drilling the injection wells. Other production wells are drilled parallel with the first one in case the initial geological store of oil per one horizontal well makes at least 50 thou t at spacing between said wells not exceeding 100 m. Multiple hydrofrac is realised for all wells. Note here that the number of multiple hydrofrac stages is selected proceeding from analytic relationship.

EFFECT: higher yield owing higher coverage.

3 ex, 1 dwg