«Oilfield engineering»

Formation of local reservoir drainage areas under the dissolved gas drive

UDC: 622.276.344:552.54
DOI: 10.33285/0207-2351-2023-7(655)-5-8

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: oil fields development, dissolved gas mode, hydrodynamic modeling, saturation pressure, reservoir drainage areas

Annotation:

The development of oil fields with definite reservoir and thermal-baric characteristics can transfer to the dissolved gas drive. The oil recovery coefficient in this drive usually does not exceed 10…15 % and is accompanied by a number of negative processes occurring in the reservoir. The article presents the results of studying the processes of degassing zones formation and management in the drainage area during a horizontal well operation in order to increase the oil recovery coefficient due to the sequential perforation intervals connection. The results of hydrodynamic modeling of an oil field development with an initial pressure close to the saturation pressure with a constant inflow along the entire horizontal part of the well and sequential connection of perforation intervals are presented. The result of the study of the processes of degassing areas formation and propagation depending on the well operating mode is given. It is shown that due to the change of the size, time of formation and propagation of the degassing areas, the perforation intervals sequential opening leads to an increase of the deposit development efficiency in the dissolved gas mode.

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