A liquid effusion and slug control device for multi-fluctuating moisture collection and transportation pipelines

Abstract

A control device for multi-fluctuant moisture gathering and transmission pipeline effusion and slug mainly comprises a back-pressure valve, a swirl generator, a vertical pipe part, an upstream flange and a downstream flange. A control method for the effusion and slug includes the steps that the back-pressure valve is opened through an upstream gas-liquid two-phase flow under the effect of a pressure difference between the front of the control device and the back of the control device; an incoming flow is transformed into a spiral flow through the swirl generator; the effusion is taken away from low-lying areas of a pipeline by using the strong liquid-carrying ability of the spiral flow; and the backflow auto-lock function of the back-pressure valve can prevent the effusion which has been taken away from gathering in the low-lying areas again. In order to improve the control result of the effusion and slug, a plurality of the control devices can be adopted to divide the multi-fluctuant moisture gathering and transmission pipeline into a plurality of processing elements, and then segment controlling is conducted; and the control device for the multi-fluctuant moisture gathering and transmission pipeline effusion and slug has the advantages of being simple in structure, convenient to operate, safe and highly efficient.

Description

Technical field: [0001] The invention discloses a liquid accumulation and slug control device, in particular to a device for reducing liquid accumulation in multi-fluctuating moisture gathering and transportation pipelines and controlling slug flow in the pipelines. Background technique: [0002] During the gathering and transportation of wet gas pipelines, as the operating pressure and temperature of the gathering and transportation system continue to drop, the dew point of the raw gas will continue to rise, resulting in the precipitation of condensed water; at the same time, with the development of the gas field, the formation of Edge water and bottom water have been extracted one after another, resulting in the gradual increase of liquid in the gathering pipeline. In the collection and transportation pipeline system laid along complex mountainous terrain, due to the action of gravity, liquid will accumulate in the low-lying places of the undulating pipeline to form effusi...

AI Technical Summary

Problems solved by technology

[0003] (1) The effective delivery cross-sectional area of ​​the gas is reduced, resulting in a decrease in the delivery efficiency of the gathering and transportation system;

[0004] (2) The existence of effusion reduces the flow area of ​​the pipeline and increases the transmission resistance, which leads to an increase in the pressure drop per unit length of the pipeline and increases energy consumption;

[0005] (3) Hydrates will be formed under certain pressure and temperature conditions, causing ice blockage accidents;

[0006] (4) Terrain-induced slug flow will cause severe fluctuations in the pressure and liquid level of the separator at the end of the pipeline, which will bring difficulties to normal production, and even lead to shutdown in severe cases;

[0007] (5) When the transported gas is acidic gas with high sulfur content and carbon dioxide, the existence of liquid accumulation will also lead to aggravated pipeline corrosion and increase the risk of leakage

However, the duration of the spiral flow is limited, especially in the late stage of gas field exploitation, the pressure of the gas well decreases, the gas flow rate becomes smaller, and the duration of the spiral flow becomes shorter. The low-lying part of the pipeline can not fundamentally solve the problems of fluid removal and slug flow control

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