METHOD FOR DEVELOPMENT OF OIL DRAWING WITH REPAIR HYDRAULISM OF PLASTER WITH CHANGE OF DIRECTION OF CRACK Russian patent published in 2018 - IPC E21B43/26 E21B47/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be applied to increase efficiency of developing low-permeability oil deposits with application of repeated hydraulic fracturing (fracturing) with change in facture direction. Method includes construction of hydrodynamic and geomechanical model of deposit, determining values of minimum horizontal regional stress, maximum horizontal regional stress, as well as initial direction of maximum local voltage, conducting on production well immediately after drilling standard geophysical survey complex and acoustic sounding or acoustic logging to determine mechanical formation parameters, subsequent perforation of well and operation of first fracturing to form fixed crack. Further, well is put into operation and during operation of production well, values of minimum Σ_min and maximum Σ_max horizontal stress and direction of maximum local stress in vicinity of production well on basis of constructed hydrodynamic model of formation taking into account filtration properties of formation, mechanical properties of formation, operation of wells, as well as initial values of minimum and maximum horizontal stresses of formation. Repeated fracturing is performed when following conditions are met: Σ_max-Σ_min>T/3, where T is tensile rock strength, and change in direction of maximum local stress relative to initial one by more than 15°.

EFFECT: technical result is to increase efficiency of oil production by carrying out repeated fracturing in production wells with creation of additional cracks on them.

1 cl, 4 dwg