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Determination of the pressure and temperature distribution along the oil well bore

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Category: Information technologies, systems analysis and administration

Last Updated on 06 November 2015

Published on 06 November 2015

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Authors:

O.V. Panevnyk, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “Ivano-Frankivsk National Technical University of Oil and Gas”, Head of Oil and Gas Fluid Mechanics Department, Ivano-Frankivsk, Ukraine.

О.Ya. Dubei, State Higher Educational Institution “Ivano-Frankivsk National Technical University of Oil and Gas”, Assistant Lecturer of Oil and Gas Fluid Mechanics Department, Ivano-Frankivsk, Ukraine.

Abstract:

Purpose. Refinement of the method of calculation of the production fluid pressure and temperature distribution along the borehole, which will give results that are more correct.

Methodology. Based on the Poettmann-Carpenter and Baksendell methods the new approach was suggested to solving differential equations using the Adams-Krylov numerical method. When using the same differential equations, but different approaches to solving, we obtained results that describe the actual processes in the borehole more accurately. Computer calculations were fulfilled to clearly demonstrate a significant difference in the thermodynamic parameters distribution for the same initial data when applying primary and derivative techniques.

Findings. Some disadvantages were revealed in the results obtained by known methods, namely: nonlinearity of the temperature-depth function and appearance of oil temperature step change at the pump suspension point. The plot of the pressure and temperature changes along the borehole made evident the difference between the received curves. In the area between the collar and the pump suspension point, which is more interesting at the calculations, the deviation reaches up to 23% for pressure and almost 4% for temperature. The usage of numerical methods for calculating eliminated the specified disadvantages and increased the received data quality.

Originality. The modification of the already-known method of determining the pressure and temperature distribution along the wellbore so that it provides results that are more adequate compared to the previous method.

Practical value. Elimination of the inaccuracies in the proposed Poettmann-Carpenter and Baksendell methods may allow receiving of more precise data on the thermodynamic parameters distribution in a well for a theoretical study of the processes that occur during the operation of oil wells.

References:

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Mishchenko, I.T., Humerskyi, Kh.Kh. and Marienko, V.P. (1996), Struinyye nasosy dlya dobychi nefti [Jet Pumps for Oil Extraction], Neft i Gas, Moscow, Russia.

2. Бойко В.С. Збірник з технологій видобування нафти / Бойко В.С. – Івано-Франківськ: Нова зоря, 2011. – Ч. III. – 407 с.

Boiko, V.S. (2011), Zbirnyk z tekhnolohii vydobuvannia nafty [Collection of Articles on Oil Production Technology], Part 3, Nova Zoria, Ivano-Frankivsk, Ukraine.

3. Коробов Г.Ю. Распределение температуры по стволу добывающей скважины / Г.Ю. Коробов, В.А. Мордвинов // Нефтяное хозяйство. – 2013. – №4. – С. 57–59.

Korobov, H.Yu. and Mordvinov, V.A. (2013), “The temperature distribution along the borehole of the producing well”, Neftyanoe Khozyaistvo, no. 4, pp. 57–59.

4. Falshtynskyi, V., Dychkovskyi, R., Lozynskyi, V. and Saik, P. (2014), “Some aspects of technological processes control of in-situ gasifier at coal seam gasification”, Progressive technologies of coal, coalbed methane, and ores mining, CRC Press/Balkema, The Netherlands, pp. 109–112.

5. Паневник О.В. Визначення розподілу тиску, температури та швидкості руху газорідинної суміші вздовж стовбура нафтової свердловини у випадку експлуатації штанговим свердловинним насосом./ О.В. Паневник, О.Я. Дубей // Науковий вісник ІФНТУНГ. – Івано-Франківськ, 2014. – №1 (36). – С. 53–60.

Panevnyk, O.V. and Dubei, O.Ya., (2014), “Determining the pressure, temperature and velocity distribution of the gas-liquid mixture along the borehole of the oil well during its operation with sucker rod pump”, Naukovyi Visnyk IFNTUOG, Ivano-Frankivsk, no. 1 (36), pp. 53–60.

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