Dynamic description method for high-water-consumption strip of water-drive reservoir

Abstract

The invention relates to the technical field of oil and gas field development, and particularly discloses a dynamic description method for a high-water-consumption strip of a water-drive oil reservoir. The method comprises the following steps of 1, collecting and arranging geological data and development data of a target oil reservoir, and constructing a streamline simulation model of the target oil reservoir by utilizing a streamline simulator; 2, calling the streamline simulator, carrying out streamline numerical simulation of target oil reservoir water-drive development, and obtaining streamline distribution results of the target oil reservoir at different moments; 3, extracting characteristic parameter values of each streamline at different moments, and calculating the pseudo-water content of each streamline; and 4, identifying positions and ranges of streamline flowing regions with the quasi-water content being more than 98% at different moments, and outputting a dynamic description result of the high-water-consumption strip of the target oil reservoir. According to the method, the positions and ranges of the streamline flowing regions with the quasi-water content being more than 98% at different moments are rapidly recognized, dynamic description of the development positions, shapes and ranges of all high-water-consumption strips of the water-drive oil reservoir is achieved more accurately, and guidance is provided for improving the development effect of the water-drive oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to the technical field of high water consumption strips in water drive reservoirs. Background technique [0002] The high water consumption strip refers to the connected area formed during the long-term water flooding process with low oil saturation, the displacement factor is much larger than other areas, and does not have the potential for continuous water flooding. Oilfield development enters the late stage of ultra-high water cut. Affected by reservoir heterogeneity, high water consumption bands generally develop, resulting in inefficient and ineffective circulation of a large amount of injected water. Identifying and describing the high water consumption zone is the prerequisite for its effective treatment, and it is also of great significance for improving the development effect of ultra-high water-cut reservoirs and reducing production costs. [0003] A...

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Problems solved by technology

[0003] At present, there are very few studies on the description of high water consumption strips. The water absorption profile method and pressure drop curve method are mainly used to judge the existence of high water consumption strips, while the tracer test method and interference well test method place too much emphasis on the absolute value of the reservoir. Permeability, the results obtained only reflect the average properties of the reservoir, not the parameters of high water consumption strips, and these methods take a long time to test and are difficult to interpret

None of the above description methods for high water consumption strips can fully consider the particularity of high water consumption strips, and are often limited to qualitative analysis. At present, there is no effective description method for high water consumption strips

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