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Hydrate occurrence form division method based on pore network model

A pore network model and hydrate technology, applied in the direction of chemical property prediction, etc., can solve the problems of no data, inaccurate hydrate classification, etc., and achieve the effect of accurate judgment and classification

Active Publication Date: 2020-12-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] In view of the above-mentioned problems existing in the prior art, the technical problem to be solved by the present invention is: the division of each form of hydrate is inaccurate, and there is no specific data as a standard

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  • Hydrate occurrence form division method based on pore network model
  • Hydrate occurrence form division method based on pore network model
  • Hydrate occurrence form division method based on pore network model

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Embodiment Construction

[0040]The present invention will be described in further detail below.

[0041]A method for classifying hydrate occurrence forms based on a pore network model includes the following steps:

[0042]S10; the establishment of division standards;

[0043]S11; according tofigure 1 Show the occurrence concepts of the three hydrate occurrence forms in porous media, and construct a two-dimensional conceptual model set of hydrates K={Kn|K1,K2,K3},among them,

[0044]Is a collection of two-dimensional conceptual models of pore-filled hydrates,Is a two-dimensional conceptual model of pore-filled hydrate with saturation m,With K1The saturation of any element in is not equal;

[0045]Is a collection of two-dimensional conceptual models of cemented hydrates,Is a two-dimensional conceptual model of cemented hydrate with saturation o,With K2The saturation of any element in is not equal;

[0046]Is a collection of two-dimensional conceptual models of coated hydrates,Is a two-dimensional conceptual model of pore-fille...

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Abstract

The invention relates to the field of hydrate form division, in particular to a hydrate occurrence form division method based on a pore network model. According to the method, hydrate shape factors ofthree hydrate occurrence forms and coordination numbers are counted, a hydrate occurrence form division standard is made, a hydrate-containing rock core needing to be divided is subjected to CT scanning, then a hydrate-containing digital rock core is established, and after the relation between the hydrate and rock core pores is judged, Shape factors and coordination numbers of the corresponding hydrates are extracted from the digital rock cores containing the hydrates and are compared by using a hydrate occurrence form division standard, so that the occurrence form of the hydrates is determined. According to the method, the division standard of the hydrate is specifically in a numerical value form, compared with an existing method, judgment and division of the occurrence form of the hydrate are more accurate and specific, and subsequent research on the influence of the hydrate on the flow characteristics of the porous medium is facilitated.

Description

Technical field[0001]The invention relates to the field of hydrate morphology classification, and in particular to a method for hydrate occurrence morphology classification based on a pore network model.Background technique[0002]Gas hydrate is a kind of ice-like crystalline compound widely distributed in continental permafrost, polar continental shelf and continental shelf marine sediments. Natural gas hydrate only produces carbon dioxide and water after burning. It is a kind of clean energy with development prospects. In the past 30 years, global energy consumption has been increasing. As a new type of clean energy, hydrate plays an important role in sustainable development. . According to documented reports, the content of natural gas hydrate is extremely high, and the carbon content is about twice the total carbon content currently known. According to the research, 1m3Natural gas hydrate can release about 0.81m3Of water and 164m3Natural gas.[0003]The more common types of hydrates...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/30
CPCG16C20/30
Inventor 孙致学刘垒刘乐乐刘昌岭安森友孙治雷
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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