Method for describing low-permeability oil reservoir fluid channeling passages rapidly and quantitatively

Abstract

The invention provides a method for describing low-permeability oil reservoir fluid channeling passages rapidly and quantitatively. The method comprises the following steps: 1, determining the quantitative description range of different types of oil reservoir fluid channeling passages of the low-permeability oil reservoir; 2, counting the permeability of the same type of oil reservoir fluid channeling passage and the changing curve of the thickness, the pore throat radius and the pore volume of the fluid channeling passage; 3, calculating a single-well A type water-driving characteristic curveof a production well and seeking the production well with an upwarped straight section in the water-driving characteristic curve; and 4, taking a water injection well as a center and marking off fluid channeling passages which are developed along different directions along different directions of a development well network. Four parameters, such as the permeability, the pore volume, the pore throat radius and the fluid channeling passage thickness, of the low-permeability oil reservoir fluid channeling passages can be calculated rapidly through low-permeability oil reservoir production dynamic data, so that quantitative identification and quantitative description of the low-permeability oil reservoir fluid channeling passages are realized.

Description

technical field [0001] The invention relates to the technical field of reservoir engineering in oil and gas field development, in particular to a method for quickly and quantitatively describing channeling channels of low-permeability reservoirs. Background technique [0002] The experience of water injection development oilfields at home and abroad shows that after water injection development oilfields enter the medium-high water cut period, the formation of channeling channels is inevitable. In the long-term water injection development process, due to geological factors such as reservoir heterogeneity and development factors such as excessive development speed of low-permeability reservoirs, the pore-throat radius of the reservoir increases, thus forming secondary high-permeability in the reservoir Strips are channeling channels, also known as dominant seepage channels, resulting in low efficiency and serious ineffective circulation of a large amount of injected water, red...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of high cost and long period of current channel identification methods, and most of the methods cannot quantitatively identify channel channels, the present invention provides a fast quantitative description method for channel channels in low-permeability reservoirs. The four parameters of permeability, pore volume, pore throat radius and channel thickness can quantitatively describe the channel channels of different scales in low-permeability reservoirs, and the permeability, pore volume, pore throat radius and channel thickness of channel channels are proposed. Calculation method and process of channel thickness