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A flow regime evaluation method considering the multi-scale effect of shale

An evaluation method and multi-scale technology, applied in the fields of earthwork drilling, data processing application, measurement, etc., which can solve the problems of not considering the unsteady gas flow, not considering the influence, and ignoring higher-order terms in the Brace model.

Active Publication Date: 2022-04-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] 1. The Brace model is based on the steady-state flow in matrix shale, and does not consider the unsteady flow of gas in the core, the influence of gas adsorption and desorption in the shale, and the impact of natural fractures developed in the shale core. The effect of gas flow
[0004] 2. The Brace model ignores higher-order terms during the solution process, resulting in an approximate solution
[0005] 3. The apparent permeability obtained by the GB / T34533-2017 test method does not consider the influence of multi-scale seepage in shale cores

Method used

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[0068] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0069] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. The words "comprising" or "comprising" and similar words used in the present disclosure mean that the elements or things appearing be...

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Abstract

The invention discloses a flow state evaluation method considering multi-scale effects of shale, comprising the following steps: S1, collecting basic parameters of shale cores; S2, establishing an apparent permeability calculation model considering multi-scale effects; S3, establishing a simultaneous There are 4 kinds of seepage models, combined with related algorithms to obtain the pressure response curves of the upstream chamber and the downstream chamber; S4, using the pulse decay method to experimentally measure the pressure response curves of the upstream chamber and the downstream chamber; S5, combining the core pressure response of different development states Model, fit the experimental data to calculate the pressure response curves of the upstream chamber and downstream chamber, and calculate the core parameters. The present invention establishes four kinds of seepage models that simultaneously exist in the shale core that considers the matrix of adsorption and desorption and the matrix + natural fractures, and calculates the pressure response curves in the upper and lower chambers, the pressure response curves obtained through calculation and the pressure measured by experiments The response curves were fitted to obtain the relevant parameters and distributions of the four flow regimes in the rock.

Description

technical field [0001] The invention relates to the field of shale development, in particular to a fluid state evaluation method considering multi-scale effects of shale. Background technique [0002] Due to the shale core and its tightness, the conventional steady-state method, pressure drop method and other core permeability testing methods cannot accurately test the gas flow through the core. Brace introduced the well testing theory into the core test in 1968, and obtained the Pulse decay method for testing ultra-low permeability core permeability. Scholars at home and abroad have conducted a lot of research on this method. The national standard GB / T34533-2017 gives the specific operation steps and methods for testing shale permeability based on the pulse decay method of the Brace matrix core model. However, there are still the following defects and problems. [0003] 1. The Brace model is based on the steady-state flow in matrix shale, and does not consider the unstead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B47/06G06Q50/02
CPCE21B47/00E21B47/06G06Q50/02
Inventor 刘建仪蒋橹袁华余凡王俊力代建伟
Owner SOUTHWEST PETROLEUM UNIV
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