METHOD OF CALCULATING VOLUME OF REVERSE FLOW OF FLUID FOR HYDRAULIC FRACTURING OF FORMATION DURING HYDRAULIC FRACTURING IN HORIZONTAL WELLS IN GAS DEPOSITS OF FRACTURED SANDSTONES

摘要

FIELD: oil and gas industry.;SUBSTANCE: present invention relates to development of oil and gas deposits, and, in particular, it relates to calculation of volume of reverse flow of fluid for hydraulic fracturing of formation at hydraulic fracturing in horizontal wells in gas deposits of fractured sandstones. Method includes steps of fractal distribution of cracks in the area of target collector D_c, fractures length fractal dimension D_l, based on crack data on-site, coefficient of density of fractures location α and Fisher constant K. Then on the basis of obtained parameters of cracks model of fractal discrete network of cracks for collector is created. After that, equivalent permeability tensor of model of fractal discrete network of cracks is calculated. Further, equivalent permeability tensor is substituted into equation of continuity of two-phase, gas-liquid, filtration flow with creation of model of reverse fluid flow for formation hydraulic fracturing. Mathematical model of reverse flow of fluid for formation hydraulic fracturing is solved, and liquid phase saturation is found with further calculation of back flow volume for formation hydraulic fracturing.;EFFECT: technical result consists in improvement of reliability and accuracy of calculation results, as well as reliability and ease of use.;5 cl, 1 tbl, 3 dwg