Method for establishing physical model capable of predicting waterflooding of fractured anisotropic oil reservoirs

Abstract

A method for establishing a physical model capable of predicting waterflooding of fractured anisotropic oil reservoirs comprises the following steps: (a) establishing the similarity criterion for development simulation of fractured oil reservoirs by utilizing the seepage mechanics theory and similarity analysis according to the characteristics of waterflooding processes of the fractured oil reservoirs, wherein the similarity criterion includes similarity of appearance to space, wellbore geometry similarity, petrophysical character similarity, oil / water viscosity similarity, gravity-pressure similarity, similarity of matrix to movable oil ratio in fractures, similarity of oil content distribution in the matrix, similarity of matrix imbibition to fracture displacement characteristic time, similarity of imbibition strength distribution and similarity of time process; (b) realizing the similarity criterion and designing the model parameters; and (c) establishing the macroscopic oil reservoir physical model satisfying multiple similarity so as to comprehensively simulate and predict the seepage characteristics and development processes of the practical fractured oil reservoirs. In the invention, a physical simulation similarity criterion system capable of predicting the fractured anisotropic oil reservoirs is established, which has comprehensive functions and is easy to realize.

Description

technical field [0001] The invention relates to a method for establishing a predictable physical model for water injection development of an anisotropic fractured reservoir, which is a new type of physical experiment method for the study of reservoir seepage and development process in the field of oil and gas field development, and is also applicable to other related fracture seepage phenomena Research areas. Background technique [0002] Fractured media oil and gas reservoirs are common all over the world, accounting for more than half of the proven undeveloped reserves. Due to the characteristics of dual media, compared with general oil and gas reservoirs, the seepage characteristics and seepage process of oil, gas, water and other fluids in this kind of oil and gas reservoirs are more complicated, and the development difficulty is also greater. For this reason, people have been trying to use physical experiment methods to simulate and predict the seepage and development ...

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Problems solved by technology

However, no successful reservoir predictive physical simulation research reports have been found before.

[0003] The main reason why predictable physical simulation of fractured reservoirs is difficult to achieve is that the built physical model cannot fully meet the similarity requirements, so it is impossible to establish a direct correspondence between the physical model and the actual reservoir

[0004] Since it is very difficult to strictly satisfy multiple similarity conditions in the laboratory, most of the previous simulation studies only established models for a small number of similarity criteria, so they can only reflect the behavior of fluids in the reservoir in certain aspects and to a certain extent. Therefore, it is impossible to fully simulate the seepage characteristics and development process of the actual reservoir, and it is also impossible to predict the actual reservoir development effect

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