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Analytical study of heat transfer in absorptive horizons of borehole at forming cryogenic protecting of the plugging material

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Category: Mining

Last Updated on 24 July 2017

Published on 24 July 2017

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Authors:

А.К.Sudakov, Dr. Sc. (Tech.), Assoc. Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.,

A.Yu.Dreus, Cand. Sc. (Tech.), Assoc. Prof., Oles Honchar Dnipro National University, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

О.Ye.Khomenko, Dr. Sc. (Tech.), Assoc. Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.,

D.A.Sudakova, State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.,

Abstract:

Purpose. Development of the method for calculating parameters of rock freezing process in cryogenic screen formation using a new innovative technology of elimination of the drilling liquid absorption in the well.

Methodology. The tasks set were solved using analytical, experimental methods of thermal physics and heat and mass transfer. Theoretical analysis is based on an analytical solution of heat transfer problem in frozen semi-infinite cylindrical layer.

Findings. The paper considers physical and mathematical statement of the problem. A mathematical model of heat transfer processes in rock massive under refrigerant impact was proposed. Temperature field dynamics in rocks is presented and relation of freezing time to frozen layer efficiency is studied. Analytical expressions for calculating the parameters of protective inverted cryogen screen formation in the absorptive horizon of a borehole are obtained.

Originality. For the first time, the relation of the efficiency of the inverted cryogen screen (a frozen layer around rocks around a borehole) to the heat treatment time of the absorptive horizon of a borehole and refrigerant temperature was defined.

Practical value. Innovative cryogenic technology of elimination of washing liquid absorption was developed. An analytical solution of heat transfer in rock at inverted cryogen screen formation around a borehole is obtained. Regularity of rock freezing time relation to inverted cryogenic screen width is established.

References

1. Brazhnenko, A.M., Hoshovskyi, S.V., and Kozhevnykov A. A., 2007. Plugging of rocks when drilling exploration wells with fusible materials: Kiev, Ukr HHRY.

2. Chudyk, I.I., Bohoslavets, V.V. and Dudych, I.F., 2016. Biopolymer-silicate mud for drilling horizontal wells. Rozvidka ta rozrobka naftovykh i hazovykh rodovyshch, 4(61), pp. 34–43.

3. Orynchak, M.I., Chudyk, I.I., Kyrchei, O.I. and Beizyk, O. S., 2015. Improving the technology of preventing landslide and crumble of the borehole walls. Rozvidka i rozrobka naftovykh i hazovykh rodovyshch, 2(55), pp. 35–42.

4. Kuzin, Yu., Isakova, M., Mostinets, O. and others 2017. Isolation technology for swallowing zones by thermoplastic materials on the basis of polyetylentereftalata. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 1. рр. 34‒39.

5. Sudakov, A.K., Kuzin, Yu.L. and Sudakova, D.A., National Mining University, 2016. A method of plugging wells. Ukraine. Pat. u201512670.

6. Attetkov, A.V., Volkov, I.K. and Tverskaya, E.S., 2010. Axisymmetric temperature field of isotropic half-space under local unsteady-state heating by environment. High temperature, 48(4), pp. 583‒587.

7. Shevchuk V.A. 2016. Unsteady one-dimensional heat conduction problem for a cylinder with thin multilayer coating. Mathematical methods and physicomechanical fields, 54(2), pp. 179–185.

8. Eslami-nejad, P. and Bernier, M., 2012. Freezing of geothermal borehole surroundings: A numerical and experimental assessment with applications. Applied Energy, 98, pp. 333‒345.

9. Kozhevnykov, A.A., Dreus, A.Yu., Lysenko, Ye.Ye. and Sudakov, A.K., 2013. Study of heat transfer in cryogenic gravel filter during its transportation along a drillhole. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 6, pp. 49–54.

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