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Gas pipeline flow safety early warning method for hydrate film shedding with fluid properties

A technology for fluid physical properties and safety early warning, applied in the direction of pipe elements, pipes/pipe joints/pipe fittings, instruments, etc., can solve the problems of inability to obtain hydrates in the submarine pipeline, fall off, etc., and achieve the improvement of the overall safety prediction of the flow of the submarine pipeline. Achieving dynamic changes, overcoming the effect of predicting pipeline flow safety

Active Publication Date: 2022-04-01
DALIAN UNIV OF TECH
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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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  • Gas pipeline flow safety early warning method for hydrate film shedding with fluid properties
  • Gas pipeline flow safety early warning method for hydrate film shedding with fluid properties
  • Gas pipeline flow safety early warning method for hydrate film shedding with fluid properties

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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 relates to a flow safety early warning method for a submarine gas transmission pipeline in which a hydrate film falls off with the physical properties of the fluid, and belongs to the technical field of pipeline flow safety. This method simulates the physical and chemical changes in the flow process of the actual pipeline, and reveals the formation, settlement, shedding and flow blockage of hydrates in the submarine pipeline under the influence of different concentrations of inhibitors. At the same time, the shedding of the hydrate deposition structure is taken into account In flow safety, the early warning system is closer to practical application and can more accurately predict the time and location of pipeline blockage. In order to provide a reference for the design of submarine pipeline safety schemes and better provide technical support for hydrate mining in sea areas, it has practical and scientific significance.

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): 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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