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Prospecting and Development of Oil and Gas Fields

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Article

Influence of the depth of gas-lift gas injection into tubing and its consumptions on the flow rate of a water-cut gas well

Roman Kondrat, Oleksandr Kondrat, L. Haidarova
Abstract

The features of the development of gas deposits in the water drive and watering of wells are characterized. The sequence of application of various methods of operation of flooded wells is considered, depending on the degree of depletion of the gas reservoir and the water factor. The expediency and conditions for the use of the gas-lift method for the operation of water-cut gas wells have been substantiated. Using the calculation method proposed by the authors, studies of the effect on the flow rate of gas flowing from the reservoir and the bottomhole pressure of the gaslift gas flow rate and the depth of its injection into the tubing have been carried out for the conditions of a model water-cut gas well. When carrying out calculations, the pressure at the wellhead, the water factor and the diameter of the tubing were taken constant and equal to the specified value. Based on the results of the studies performed, graphical dependences of the gas flow rate that comes from the reservoir, bottomhole pressure on the gas-lift gas flow rate and the depth of its introduction into the tubing have been made; the dependence of the minimum and maximum gas-lift gas flow rates on the relative depth of gas-lift gas injection into the tubing has also been established. It was found that with an increase in the gas-lift gas flow rate, the bottomhole pressure first decreases and reaches a minimum and then increases, while the gas flow rate, on the contrary, first increases, reaching a maximum, and then decreases. With an increase in the depth of gas-lift gas injection into the tubing, the bottomhole pressure decreases, the gas flow rate increases, and the difference between the maximum and minimum values of the gas-lift gas flow rate increases, within which a water-cut gas well can be operated by the gas-lift method. According to the results of statistical processing of the calculated data, it was found that the greatest change in gas flow rate and bottomhole pressure occurs up to the values of the ratio of the depth of gas-lift gas injection into the tubing and the length of the tubing, equal to 0.50-0.55

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Received 25.08.2021

Revised 25.08.2021

Accepted 25.08.2021

https://doi.org/10.31471/1993-9973-2021-3(80)-19-25
Retrieved from Vol. 21, No. 3, 2021
Pages 19-25

Suggested citation

Kondrat, R., Kondrat, O., & Haidarova, L. (2021). Influence of the depth of gas-lift gas injection into tubing and its consumptions on the flow rate of a water-cut gas well. Prospecting and Development of Oil and Gas Fields, 21(3), 19-25. https://doi.org/10.31471/1993-9973-2021-3(80)-19-25

References

References in the process of publication

Ivano-Frankivsk National Technical University of Oil and Gas 76019, 15 Karpatska Str., Ivano-Frankivsk, Ukraine

  • nung@pdogf.com.ua