DEVELOPMENT OF LOW-PERMEABILITY OIL POOLS BY HORIZONTAL WELLS WITH MAINTENANCE OF SEAM PRESSURE Russian patent published in 2014 - IPC E21B43/20 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. Working fluid is injected in injection wells to withdraw the products from production wells. Note here that at least one production and one injection wells are drilled in seams with permeability not over 2 mD and distance between horizontal shafts of at least 50 m. Production wells are arranged at maximum oil saturation strata. Angle between the maximum main strain of the seam and direction of horizontal shafts of production and injection wells makes some 30-60 degrees. The number of N stages of multiple hydraulic fracturing is selected proceeding from the condition N=1+L/100, where L is the well horizontal shaft length to be rounded to a large integer. Total amount of horizontal wells is drilled so that specific initial geological oil store per one horizontal well makes at least 50 thou t.

EFFECT: higher oil yield.

2 cl, 1 dwg