The development of multi-layer objects by a single filter leads to the impossibility of regulating the created depression on each layer independently of each other, which necessitates the use of special methods for monitoring energy, production and filtration properties. One of such methods is the use of permanent downhole gauges (PDG), which measure parameters such as pressure, temperature, flow, moisture content in front of each stratum with a string of complex geophysical instruments. High values of water cut and differentiation of reservoir pressures of a multi-layer development facility, which is a characteristic feature of the middle and late stages of development of the Republic of Bashkortostan, lead to a distortion of the recorded parameters. Therefore, special well tests are required to control reservoir pressure, productivity and reservoir development. To determine the individual values of reservoir pressure and the reservoir productivity index of a multi-layered object, an analysis was performed using methods proposed by a number of authors in the middle of the 20th century. To refine the composition of the inflow, a method based on the Joule – Thomson effect is proposed. Similar to the analysis of steady-state studies using an indicator diagram, the Joule – Thomson coefficient was determined from the pressure-temperature plot, constructed from the points obtained when stabilizing the bottomhole pressure and temperature at several steady-state regimes. Application of thermo-hydrodynamic methods of well tests allowed to determine individual values of reservoir pressure, productivity index, hydroconductivity, permeability and skin factor of each of the investigated layers of a multi-layered object.
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