Targeting gas injection method and system for fractured-vuggy carbonate reservoir

Abstract

The invention provides a targeting gas injection method and system for a fractured-vuggy carbonate reservoir. The targeting gas injection method comprises the steps that the gas injection type is determined, specifically, based on a gas injection screening principle, the gas injection type of the to-be-analyzed fractured-vuggy carbonate reservoir is determined; gas injection wells are screened, specifically, the gas injection wells are screened according to distribution parameters of the to-be-analyzed fractured-vuggy carbonate reservoir; a gas injection parameter optimization model is established, specifically, according to geological parameters of the to-be-analyzed fractured-vuggy carbonate reservoir, the gas injection parameter optimization model of the to-be-analyzed fractured-vuggy carbonate reservoir is established to obtain the optimal gas injection parameter; and targeting oil displacing is conducted, specifically, according to the optimal gas injection parameter, gas corresponding to the gas injection type is injected into the screened gas injection wells to achieve targeting oil displacing. The gas injection recovery rate of the carbonate rock reservoir can be increased.

Description

technical field [0001] The invention relates to the field of oilfield development, in particular to a method and system for targeted gas injection in a fracture-cavity carbonate reservoir. Background technique [0002] The production of carbonate reservoirs accounts for more than 60% of the total global production, and is one of the important fields of oil recovery in the 21st century. The development of carbonate reservoirs has the characteristics of high single well production, rapid decline in formation pressure and rapid decline in production. At the same time, the fracture-cavity carbonate geological structure is complex, the sealing property near the oil-water interface and the low oil storage properties make the traditional development methods in carbonate reservoir development less effective. In the later stage of waterflooding development of carbonate reservoirs, the water content increases, the distribution of underground oil and water becomes more complex, and th...

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Problems solved by technology

Domestic methods for the development of carbonate reservoirs include: the acquisition method of the three-dimensional permeability field of fractured-vuggy reservoirs, the physical experiment method of gas injection in fractured-vuggy reservoirs, and the method of enhanced oil recovery for fractured reservoirs. Methods Through physical experiments and numerical simulation calculations, the mechanism of enhanced oil recovery by gas injection in fractured-vuggy reservoirs has been studied, but no effective method has been formed yet, resulting in low gas recovery of fractured-vuggy carbonate reservoirs

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