Method for characterizing fracture-cavern type reservoir water-drive recovery effects

Abstract

The invention provides a method for characterizing fracture-cavern type reservoir water-drive recovery effects, and relates to the field of fracture-cavern type reservoir recovery technologies. The method includes acquiring reservoir displacement pressure difference, water and oil density difference, local gravitational acceleration of reservoirs and reservoir thicknesses in fracture-cavern type reservoir recovery time; determining gravitational dimensionless numbers corresponding to the fracture-cavern type reservoir recovery time according to the reservoir displacement pressure difference, the water and oil density difference, the local gravitational acceleration of the reservoirs and the reservoir thicknesses; determining reservoir recovery ratios corresponding to the fracture-cavern type reservoir recovery time; determining relation curves of gravitational dimensionless numbers and reservoir recovery ratios according to the gravitational dimensionless numbers and the reservoir recovery ratios corresponding to the fracture-cavern type reservoir recovery time; determining the gravitational dimensionless numbers under the conditions of maximum reservoir recovery ratios according to the relation curves. The method has the advantage that problems of deficiency of methods for characterizing fracture-cavern type reservoir water-drive recovery effects at present and inapplicability of capillary tube numbers of the traditional sandstone reservoirs to evaluating fracture-cavern type reservoir recovery effects can be solved by the aid of the method.

Description

technical field [0001] The invention relates to the technical field of fracture-cavity oil reservoir exploitation, in particular to a method for characterizing the water flooding exploitation effect of the fracture-cavity oil reservoir. Background technique [0002] At present, carbonate reservoirs are an important type of reservoirs, which contain more than 60% of the world's oil and gas resources, and the proportion of fracture-cavity reservoirs in carbonate reservoirs exceeds 30%. Many large oil and gas fields abroad, such as Puckett Oilfield and Yates Oilfield in west Texas, Golden Harbor Oilfield in eastern Mexico, and most oilfields in Saudi Arabia, Iraq, Iran, Oman, Syria and other countries in the Middle East, are produced by carbonic acid. Composition of salt rock fracture-cavity reservoirs. In recent years, China has also made some breakthroughs in the exploration and development of deep-buried carbonate reservoirs in the Tarim Basin, Ordos Basin and Bohai Bay Bas...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for characterizing the effect of water flooding in fractured-vuggy reservoirs, to solve the problem that there is no method for characterizing the effect of water flooding in fractured-vuggy reservoirs, and the capillary number of traditional sandstone reservoirs is not suitable for fractured-cavity reservoirs. Problems in Evaluation of Development Effect of Cave Reservoir

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