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Flow safety early warning method for submarine gas pipeline with hydrate film falling off along with fluid physical property

A technology for fluid physical properties and safety early warning. It is applied in the direction of pipe components, pipes/pipe joints/pipes, instruments, etc., which can solve the problems of inability to obtain hydrates in submarine pipelines and shedding.

Active Publication Date: 2021-05-14
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the flow safety assessment cannot obtain real-time images of the hydrate formation and blockage process in the submarine pipeline, and there is currently no solution for the different degrees of shedding of the hydrate film structure of the submarine gas pipeline with the change of fluid physical properties under the influence of inhibitors

Method used

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  • Flow safety early warning method for submarine gas pipeline with hydrate film falling off along with fluid physical property
  • Flow safety early warning method for submarine gas pipeline with hydrate film falling off along with fluid physical property
  • Flow safety early warning method for submarine gas pipeline with hydrate film falling off along with fluid physical property

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Embodiment Construction

[0061] figure 1 and figure 2 A flow chart of the method is shown, and the method includes the following steps: S1, collect basic information of all pipelines in the area, including pipeline inner diameter, pipeline outer diameter, pipeline length, pipeline material, ambient temperature, inhibitor type, inhibitor concentration , fluid temperature, fluid inlet pressure, etc. The hydrate equilibrium triple point is obtained by inputting parameters, fluid pressure and fluid temperature at the inlet of the submarine gas pipeline;

[0062] S2. According to the type of inhibitor and the concentration of the inhibitor, call the corresponding model from the preset system to obtain the water activity of the submarine pipeline system, thereby calculating the subcooling degree of the submarine gas pipeline system;

[0063] S3. Based on the subcooling degree of the pipeline system, the hydrate formation amount is calculated through the first-order kinetic formula of hydrate formation, a...

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Abstract

The invention discloses a flow safety early warning method for a submarine gas pipeline with a hydrate film falling off along with fluid physical properties, and belongs to the technical field of pipeline flow safety. According to the method, physical and chemical changes in the flowing process of an actual conveying pipeline are simulated, formation, sedimentation, falling and flowing blockage conditions of hydrates in the submarine pipeline under influence of inhibitors with different concentrations are revealed, and meanwhile falling of a hydrate deposition structure is considered in pipeline flowing safety; so that the early warning system is closer to practical application and can predict the pipeline blockage time and place more accurately. Reference is provided for submarine pipeline safety scheme design, technical support is better provided for sea area hydrate exploitation, and practical and scientific significance is achieved.

Description

technical field [0001] The invention belongs to the technical field of submarine gas pipeline early warning, and in particular relates to a flow safety early warning method and system for a submarine gas pipeline in which a hydrate film falls off with fluid physical properties under the action of an inhibitor. Background technique [0002] As a clathrate compound, natural gas hydrate is a solid compound formed by methane gas and water under low temperature and high pressure conditions. In the process of oil and gas exploitation and transportation, especially the low temperature and high pressure in the deep water environment is more conducive to the formation of hydrates. However, if the natural gas hydrates cannot be disposed of on site and block the pipeline, the oil and gas recovery efficiency will be seriously affected. Therefore, the pipeline Research on the flow safety problems caused by hydrate blockage in the road is the basic guarantee for solving the above problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28F16L55/24G06F113/14G06F119/08G06F119/14
CPCG06F30/28F16L55/24G06F2113/14G06F2119/14G06F2119/08
Inventor 陈天宇王大勇李孟昕
Owner DALIAN UNIV OF TECH
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