Numerical analysis of thermohydrodynamic processes in the injection well and reservoir with a fracture

UDK: 622.276.432
DOI: 10.24887/0028-2448-2018-8-42-46
Key words: temperature, pressure, fracture, temperature/pressure transient well tests, numerical simulation
Authors: Yu.А. Pityuk (RN-UfaNIPIneft LLC, RF, Ufa; (Bashkir State University, RF, Ufa), А.Y. Davletbaev (RN-UfaNIPIneft LLC, RF, Ufa), I.А. Zarafutdinov (RN-UfaNIPIneft LLC, RF, Ufa; Bashkir State University, RF, Ufa), А.А. Musin (Bashkir State University, RF, Ufa), L.А. Kovaleva (Bashkir State University, RF, Ufa)

In spite of the fact that the transient well tests are an integral part of the methods of control over the oil-field development, the “traditional” methods of pressure well testing do not provide one detailed information filtration properties of a fracture. Considering the temperature dynamics in the operation or shut-in well is a way to expand the number of determined reservoir parameters. Present methods, based on analytical solutions, do not allow one to take into account all significant thermohydrodynamic processes. Therefore, a three-dimensional numerical simulation of the pressure and temperature propagation taking into account all the thermodynamic effects in the well, reservoir and fracture is a relevant problem.

The aim of the present work is the development of a program code to study thermohydrodynamic processes in injection wells in the presence of a fracture, as well as analysis of the numerical simulation results. A mathematical model describes the propagation of temperature and pressure in the reservoir for a three-dimensional case and in the vertical well for a one-dimensional case, taking into account the throttling effect and adiabatic expansion. On the basis of numerical simulation the analysis of the temperature change in the well and reservoir with a fracture, and temperature sensitivity to the change in flow rate are conducted. The proposed approach is used to analyze the pressure and temperature data obtained during pressure fall-off tests and temperature build-up tests in the injection well with a fracture.


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