The influence of nitrogen injection duration at the initial gas-water contact on the gas recovery factor

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.224244

Abstract

This paper reports a study that employed a digital three-dimensional model of the gas condensate reservoir to investigate the process of nitrogen injection at the boundary of initial gas-water contact at different values of the injection duration. The calculations were performed for 5, 6, 8, 10, 12 and 14 months injection duration. Based on the modeling results, it was found that increasing the duration of the nitrogen injection decreases the operation time of production wells until the breakthrough of non-hydrocarbon gas. Based on the analysis of the technological indicators of reservoir development, it was established that the introduction of technology of the nitrogen injection into a reservoir ensures a reduction in the volume of reservoir water production. The cumulative water production at the time of nitrogen breakthrough to the production wells at the nitrogen injection duration of 5 months is 197,3 thousand m3; of 14 months – 0,038 m3. According to the results from the statistical treatment of estimation data, the optimal value for the nitrogen injection duration was determined, which is 8,04 months. The ultimate gas recovery factor for the optimal period of the non-hydrocarbon gas injection is 58,11 %, and in the development of a productive reservoir for depletion – 34,6 %. Based on the research results, the technological efficiency of nitrogen injection into a productive reservoir has been determined at the boundary of initial gas-water contact in order to slow the movement of reservoir water into gas-saturated horizons. This study results allow the improvement of the existing technologies of hydrocarbon fields development under conditions of water drive. The use of the results of the research carried out in production will make it possible to reduce the volume of cumulative water production and increase the ultimate gas recovery factors to 23,51 %

Author Biographies

Serhii Matkivskyi, Ivano-Frankivsk National Technical University of Oil and Gas; Ukrainian Scientific-Research Institute of Natural Gas

Postgraduate Student

Department of Petroleum Production

Head of Department

Department of Hydrocarbon Fields Development Planning

Oleksandra Kondrat, Ivano-Frankivsk National Technical University of Oil and Gas

Doctor of Technical Sciences, Professor, Head of Department

Department of Petroleum Production

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Published

2021-02-10

How to Cite

Matkivskyi, S., & Kondrat, O. (2021). The influence of nitrogen injection duration at the initial gas-water contact on the gas recovery factor. Eastern-European Journal of Enterprise Technologies, 1(6 (109), 77–84. https://doi.org/10.15587/1729-4061.2021.224244

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Section

Technology organic and inorganic substances