Flow safety early warning method of submarine gas pipeline with hydrate deposition structure shedding

A technology for safety early warning and gas pipelines, which is applied in pipeline systems, alarms, gas/liquid distribution and storage, etc. It can solve problems such as inability to obtain submarine pipelines, improve the overall safety prediction of submarine pipeline flow, and reduce transportation costs. effect of risk

Active Publication Date: 2022-04-01
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 of submarine gas pipeline with hydrate deposition structure shedding
  • Flow safety early warning method of submarine gas pipeline with hydrate deposition structure shedding
  • Flow safety early warning method of submarine gas pipeline with hydrate deposition structure shedding

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Experimental program
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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 transmission pipeline with hydrate deposition and shedding, which belongs to the technical field of pipeline flow safety. Its early warning method includes collecting the basic information of all pipelines in the area, calculating the subcooling degree based on the type and concentration of the inhibitor, calculating the change value of the hydraulic diameter with time through the amount of hydrate formation, calculating the flow shear force of the system and communicating with the early warning system. The preset sedimentary structure stress is compared to determine whether shedding occurs; finally, the hydraulic diameter is updated, and the flow safety of the pipeline is judged according to the pressure difference between the inlet and outlet of the pipeline, and whether an early warning is required. This method realizes the dynamic identification of the thickness of the hydrate film with the size of the hydraulic diameter, reproduces the shedding phenomenon of the sedimentary structure, further improves the accuracy of pipeline prediction, and improves the safety of seabed natural gas transportation.

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 Patents(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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