METHOD OF CALCULATING PRODUCTIVITY OF HORIZONTAL WELLS IN DEPOSITS OF SHALE GAS DURING HYDRAULIC FRACTURING IN CONDITIONS OF NON-STATIONARY DIFFUSION

摘要

FIELD: mining.;SUBSTANCE: invention relates to a method of calculating the productivity of horizontal wells in deposits of shale gas during hydraulic fracturing under conditions of non-stationary diffusion. Method comprising steps of: collecting hydraulic fracturing parameters obtained as a result of a hydraulic fracturing operation, and calculating coefficient of elastic capacity of shale gas deposit, coefficient of permeation between pores under conditions of non-stationary diffusion, module of dimensionless permeability, adsorption/desorption coefficient of shale gas and limited throughput capacity of fractures from hydraulic fracturing. Position of cracks from hydraulic fracturing is determined in rectangular coordinate system; cracks are separated from hydraulic fracturing and coordinates of microelements of all cracks are determined; on the basis of the theory of the point source function and the superposition principle for pressure drops pressure is found at the end of each fracture from hydraulic fracturing. Based on the principle of equivalent area, a model of leakage through fractures from hydraulic fracturing is created with obtaining pressure for each fracture from hydraulic fracturing in the horizontal wellbore. Productivity of a horizontal well in deposits of shale gas during hydraulic fracturing under conditions of non-stationary diffusion is calculated.;EFFECT: present invention is reliable and simple to use, wherein on the basis of the specified parameters of the shale gas collector and parameters of fractures from hydraulic fracturing, productivity of horizontal wells in deposits of shale gas during hydraulic fracturing under conditions of non-stationary diffusion can be accurately predicted.;1 cl, 2 dwg, 1 tbl