Release:
2021. Vol. 7. № 3 (27)About the authors:
Ayrat Sh. Ramazanov, Dr. Sci. (Tech.), Professor, Department of Geophysics, Bashkir State University (Ufa); ramaz@bsunet.ruAbstract:
Thermometry is the most informative method in the complex of field geophysical research. The method is applied at all stages of the well’s life. Modern technologies for recording the temperature in the well, for example, using a distributed fiber-optic sensor, allow continuous research, and in particular, to carry out temperature probing of the developed formations. Temperature sensing data can be used as an additional (alternative to pressure) independent source of information on reservoir properties.
To assess the parametric sensitivity of the temperature field in the well and to solve inverse problems of thermometry, mathematical models are needed to describe the thermohydrodynamic processes both in the reservoir and in the well.
This article is devoted to the development of an analytical model describing the change in temperature and pressure in the reservoir after a well shut-in, taking into account some approximations: zero compressibility of the reservoir, fluid and thermal conductivity. The pressure distribution in the reservoir is found from the solution of the piezoconductivity equation. And the temperature distribution from the heat flow equation. The method of characteristics was used for the solution.
The results of comparison of analytical and numerical solutions for temperature changes in a shut-in well are presented. It follows from the results obtained that the temperature after well shut-in is sensitive to the size of the near-wellbore zone with altered permeability and to the distribution of permeability in the formation.
The proposed analytical solution can be used in thermosimulators to solve inverse problems in order to estimate the parameters of the near-wellbore formation zone based on actual measurements of unsteady temperature in the wellbore of production wells, as well as for planning production geophysical studies using the thermometry method.
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