Flow safety early warning method for submarine gas pipeline through falling-off of hydrate deposition structure

A technology for safety early warning and gas transmission pipelines, applied in pipeline systems, alarms, gas/liquid distribution and storage, etc., can solve problems such as inability to obtain submarine pipelines, predict the time and location of pipeline blockages, and reduce transportation risks , the effect of accurate pipeline blockage time and location

Active Publication Date: 2021-06-22
DALIAN UNIV OF TECH
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  • Claims
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Problems solved by technology

[0003] The current flow safety assessment cannot obtain real-time images of the hydrate formation blockage process in the submarine pipeline, and there is currently no solution for the flow safety problem in the submarine gas pipeline transportation process under the influence of different concentrations of thermodynamic inhibitors

Method used

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  • Flow safety early warning method for submarine gas pipeline through falling-off of hydrate deposition structure
  • Flow safety early warning method for submarine gas pipeline through falling-off of hydrate deposition structure
  • Flow safety early warning method for submarine gas pipeline through falling-off of hydrate deposition structure

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Embodiment Construction

[0056] S1. Collect the 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;

[0057] 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;

[0058] 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, and the dynamic change of the hydraulic diameter of the pipeline and the change trend of the temperature a...

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Abstract

The invention discloses a flow safety early warning method for a submarine gas pipeline through falling-off of hydrate depositions, and belongs to the technical field of pipeline flow safety. The early warning method comprises the following steps that 1, basic information of all pipelines in an area is collected, the degree of supercooling is calculated based on the type and concentration of an inhibitor, the change value of the hydraulic diameter along with time is calculated through the hydrate generation amount, the flow shear force of a system is calculated and compared with the preset sedimentary structure stress in the early warning system, and whether falling occurs or not is judged; and 2, the hydraulic diameter is updated, and the pipeline flow safety is judged and whether early warning is needed according to the pipeline inlet and outlet pressure difference. According to the method, the thickness of a hydrate film is dynamically identified along with the hydraulic diameter, the falling phenomenon of a sedimentary structure is reproduced, the accuracy of pipeline prediction is further improved, and the safety of submarine natural gas transportation is improved.

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): F17D5/00F17D3/01G01D21/02G08B19/00
CPCF17D5/00F17D3/01G01D21/02G08B19/00
Inventor 李孟昕王大勇陈天宇沙婕宋永臣范佳瑞毕晶晶胡佩
Owner DALIAN UNIV OF TECH
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