Results of the Study of the Productive Characteristics of Wells in the Development of Gas Condensate Deposits

Abstract

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.