ANALYZING RESULTS OF THE WELL TESTING USING PRESSURE DRAW-DOWN CURVE METHOD AFTER HYDRAULIC FRACTURING

Abstract

The study presents an analysis of well testing using the pressure draw-down curve method after hydraulic fracturing in 2018‒2019. According to the analysis, that 67 % of studies are not data-supported, whereas 33 % are credible. Some study parameters were not employed due to the reasons described in the article. A scrutinized analysis of possible deviations in the results of the studies from the design concept for hydraulic fracturing is conducted. It is noted that fracture half-length and formation pressure determined by well testing differ from those determined by planning. Based on the results of the pressure draw-down curve, the author determines the dependence of the time required for the diagnosis of radial filtration mode on the range of reservoir permeability and the value of the half-length of a fracture. Based on the Nolte‒Smith plot, an approach to determining the nature of fracture development is proposed in order to obtain parameters sig-nificant for planning, control, and analysis of field development and geological and engineering activities and are used for detecting well deliverability and inflow area created due to hydraulic fracturing.