Heterogeneous dense oil deposit seepage flow time scale analysis method

Abstract

The invention discloses a heterogeneous dense oil deposit seepage flow time scale analysis method. An implementation method system, a modal analysis method, a production data output mode are included. The implementation method system includes a seepage flow model integral transformation method, a Laplace space solving method and an integral transformation retrieval method. The modal analysis method includes a method for converting a generalized eigenvalue problem into a sparse diagonal matrix eigenvalue problem, a method for obtaining a sparse diagonal matrix eigenvalue and an eigenvector, and a method for refining a generalized eigenvalue and an eigenvector; the production data output mode includes a time scale distribution diagram, and a production data time domain expression. Production data is decomposed according to the time scale, meanwhile, the production data contributions and mutual coverage relations of time scales are analyzed, the method has the advantages of being precise, reflecting dense oil deposit anisotropism, reflecting covered and developed regions and the like, and the method can be popularized and promoted in oil enterprises, scientific research institutions, colleges and universities in the field of oil-gas field development.

Description

A Time Scale Analysis Method for Seepage in Heterogeneous Tight Reservoirs technical field The invention relates to a time-scale analysis method for seepage in heterogeneous tight oil reservoirs, and belongs to the technical field of seepage simulation for oil and natural gas fracturing development. Background technique At the end of the 1960s, time-scale analysis was first proposed by geologist Ericson David B., and now a variety of time-scale analysis method systems have been formed, including integral transformation methods, different time steps, and perturbation rules. Wait. After the time-scale analysis was introduced in the early 1970s in China, research and exploration continued. Up to now, time-scale analysis has been widely used in meteorology, hydrology, heat transfer, structural mechanics and other fields. The exploration field of tight oil and gas reservoirs in China is vast, and staged fracturing of horizontal wells, volume fracturing, imitation of horizonta...

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Problems solved by technology

However, this method has the following problems. First, it is still based on a homogeneous model without considering the heterogeneity caused by the fracture network; second, due to the volume averaging of the medium, the time scale obtained is less, and the time scale cannot be obtained well.

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