Heterogeneous core model and preparation method thereof

Abstract

The invention provides a heterogeneous rock core model and a preparation method thereof. The method comprises the following steps: preprocessing a rock core body processed into a predetermined shape; quartz sand and epoxy resin are mixed to form an adhesive with the permeability close to that of the core body; the at least two pretreated rock core bodies are bonded through the bonding agent; and cutting the bonded core body according to a preset size to prepare the heterogeneous core model. According to the method, multiple outcrop cores with the same layer position or similar physical properties as a natural core of a reservoir can be adopted and integrally bonded, pressed and cut to form a multi-layer heterogeneous one-dimensional long core model with the single length of 1 m, the stability of seepage can be guaranteed, the vertical heterogeneity of the reservoir can be simulated, and the method has the advantages of being simple in structure, convenient to operate and high in practicability. And particularly, the method has greater advantages in development of a method for enlarging the swept volume, the technical progress of experimental means is promoted, and a physical simulation oil displacement experimental method is perfected.

Description

technical field [0001] The invention relates to petroleum development experiment technology, in particular to a heterogeneous rock core model and a preparation method thereof. Background technique [0002] In the field of petroleum development experiment technology, the one-dimensional long core physical simulation oil displacement experiment can statically simulate the reservoir rock pore structure, obtain relevant parameters of the oil displacement process, and dynamically reflect different reservoir conditions, injection methods, and injection medium displacement processes The pressure distribution, fluid physical property changes, displacement front and other seepage laws provide technical support for oil and gas reservoir development plan design, dynamic analysis and development decision-making. [0003] In the prior art, due to the limitation of coring technology, the length of the natural core is not more than 10cm, and it is impossible to use a single natural core of...

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Problems solved by technology

[0003] In the prior art, due to the limitation of coring technology, the length of the natural core is not more than 10cm, and it is impossible to use a single natural core of 1m or longer in the one-dimensional long core physical simulation oil displacement experiment. Therefore, usually the Several pieces of short cores that have been polished, cleaned and dried are arranged and spliced ​​into long core groups according to the harmonic average method. This method has the following three disadvantages: first, there are joints between the cores, and the end effect cannot be avoided. Improper operation will lead to The sealing of the rubber cartridge fails; secondly, the physical properties of the cores are quite different, and the seepage characteristics of each core are inconsistent; finally, the vertical heterogeneity of the reservoir cannot be simulated

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