Influence of oil and gas phase movement on the process of increasing oil production during gas re-injection into the gas cap of the oil fringe

UDK: 622.276.41

DOI: 10.24887/0028-2448-2026-2-36-38

Key words: associated petroleum gas, gas re-injection, oil displacement by gas, gas cap, Novoportovskoye field

Authors: A.V. Voyvodyanu (Gazprom Neft Companу Group, RF, Saint Petersburg); I.V. Kovalenko (Gazprom Neft Companу Group, RF, Saint Petersburg); O.V. Fominykh (Industrial University of Tyumen, RF, Tyumen)

The re-injection of associated petroleum gas into the gas cap is an effective way of its temporary utilization until the necessary infrastructure for its further use is built. The experience of implementing such projects showed a positive impact of gas re-injection on the oil recovery factor. The increase in the oil recovery factor is achieved by changing the mobility of the oil and gas phases which depends on the properties of the reservoir, reservoir fluids, and the injected gas. The article presents the results of calculating the change in mobility of the oil and gas phases and the additional oil production for various calculated changes in mobility. The calculations were performed for several oil and gas condensate fields of the Gazprom Neft Companу Group. As a result of these calculations, it was found that an increase in the oil recovery factor occurs when the mobility ratio of the oil and gas phases exceeds 143. When the mobility ratio is lower, there is a loss of oil due to the breakthrough of injected gas. Taking into account the calculation error, gas reinjection has a positive effect at phase mobility ratios below 150. Above this value, oil recovery decreases due to the predominance of gas breakthrough to the oil wells over the effect of maintaining reservoir pressure. An increase in the oil recovery factor occurs when the conditions for partially mixed displacement of oil by gas are met, which is possible under high reservoir pressures and low viscosity of the reservoir oil.

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