Currently, to determine the productive characteristics and diagnose the state of the bottomhole zone of wells (BHZ) operating the gas condensate deposits of the Beregovoye field, studies are being carried out, which include a set of interrelated methods that differ in theoretical basis, technology and execution technique. The purpose of these studies is to obtain information on the thermobaric parameters of the formation fluid in the reservoir, on the productive characteristics of wells, on the filtration-volumetric and mechanical properties of the porous medium. In this case, the curve of the derivative of the pressure drop at the bottom of the well with respect to the logarithm of time, built in two logarithmic axes, is widely used. To construct this diagnostic curve, three types of data are used: pressure recovery curve (HPC); pressure stabilization curve at constant well flow rate and studies with arbitrary change in flow rate and bottomhole pressure. Using the curve of the derivative of the pressure drop over the logarithm of time, a very wide range of possible structure of the wellbore area, the shape of its drainage boundaries, fractures, double media, etc., is diagnosed. When determining the productive characteristics during the development of the reservoir, the nature of the pressure change over the reservoir area was studied. The frequency of measurement of reservoir pressure by wells was established taking into account the geological features of the Beregovoye field and the rate of formation gas withdrawal from the reservoir.

Abstract. The Bazhenov shale, the unique object of concentration of nonconventional reserves of hydrocarbons, is the main petromaternal rock of the central part of the West Siberian lowland. It is traced practically in all its territory, both by seismic cuts, and according to correlation schemes of wells' cuts. According to some experts' estimates, about 15% of oil resources in Western Siberia occur in siliceous and clay rocks of the Bazhenov shale, where at the beginning of 2016 more than 90 fields with inflow of oil from clay rocks are registered. Owing to high inhomogeneity of the layer, low filtrational and capacitor properties, high water repellency, geological and other features, the Bazhenov shale on Western Siberia fields either has not been developed, or oil production conducted as trial tests. The main goal of this article is the presentation of researches' results and development of the Bazhenov shale on two perspective fields of Western Siberia.

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The development of oil and gas condensate fields is accompanied by phase transformations of reservoir mixtures, i.e. the when the bottomhole pressure drops below the dew point pressure, the liquid condensate becomes versatile and enters the gas phase. Retrograde condensate leads to a decrease in phase permeability in the bottomhole. As a result, it also leads to a decrease in production levels is reduced both by gas and natural gas liquids. The article considers this challenge and its possible solutions by the method of unsteady-state conditions well efficiency, on which the hydraulic fracturing was carried out. The issue of well efficiency is urgent in conditions abnormally high reservoir pressure and considerable condensate yield.

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