Bypass tube cleaner with slug flow control function

Abstract

The invention relates to a bypass tube cleaner with the slug flow control function. The multiple functions of tube cleaner speed control, liquid carrying wet gas atomization, tube cleaning liquid slug vortex blowing and tube cleaning liquid slug backflow prevention are integrated; a speed control cavity is designed, a bypass channel is closed through bypass balls different in size and weight, pushing force is provided through the front and back pressure difference of the tube cleaner, the bypass balls are jacked, the bypass rate is changed, and automatic speed control over the tube cleaner is achieved; an atomization cavity is designed, one part of high-pressure gas enters a throttle channel for pressure reduction, negative pressure is formed in the atomization cavity, liquid drops in wet natural gas in the cavity are atomized, and the other part of high-pressure gas jacks open a one-way valve to enter the atomization cavity and carries atomization gas to flow out; and a vortex blowing cavity is designed, the atomization gas enters multiple vortex units to form three-stage rotational flow, the liquid slug at the front end of the tube cleaner is blown, outlets and inlets of the vortex units are arranged in a tangent manner, and backflow of the liquid slug at the front end of the tube cleaner is avoided.

Description

technical field [0001] The invention relates to a bypass pig with slug flow control and belongs to the technical field of pipeline pigging operations. Background technique [0002] In the wet gas gathering and transportation system of the gas field, the pipeline has serious liquid accumulation. The use of conventional pigs to pig the pipes results in a large change in the pipeline pressure during pigging, and the impact force of the pig liquid plug on the pipeline is large. Reaching downstream, causing flooding of downstream slug handling devices. [0003] By using traditional bypass pigs, the impact of pigging operations on normal production and pipeline operation safety is reduced, and the impact of the air flow at the rear end of the pig on the front-end liquid column is used to extend the pigging liquid plug to reach the downstream liquid plug processing device time, reducing the risk of flooding downstream liquid slug handling devices. [0004] There are problems in t...

AI Technical Summary

Problems solved by technology

[0004] There are problems in the pigging process of the traditional bypass pig: during the process of removing the liquid accumulation in the pipeline, at the uphill pipe section, the front end of the traditional bypass pig has a large amount of liquid plug and a large hydrostatic pressure. Due to the gravity of the pipe itself, the power to push the ball is insufficient, the pressure at the front end of the pig is greater than that at the rear end, the pig moves in the opposite direction, the pig liquid plug moves from the front end of the pipe pig through the bypass channel to the rear end, and the pig liquid plug returns , staying in the pipeline, affecting the smooth flow of gas and causing fluctuations in the speed of the pig; the bypass rate of the traditional bypass pig (the ratio of the cross-sectional area of ​​the bypass channel opened to the cross-sectional area of ​​the pig) is a fixed value, and the cleaning The speed of the pipe can not be adjusted according to the amount of liquid plug at the front end of the pipe pig; the gas in the traditional bypass pig cannot generate vortex, which affects the effect of purging the pig liquid plug

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