Anti-freezing and plugging system of high-pressure gas production pipeline in condensate gas field

Abstract

The invention discloses an anti-freezing and anti-blocking system for condensate gas field high pressure gas exploitation pipelines. The system comprises a gas well collecting tree, a horizontal type separator, a scroll type high pressure gas expander, power source junction boxes, pipeline electric tracing ribbons, an electric generator and a transformer, the horizontal type separator is communicated with the gas well collecting tree and the scroll type high pressure gas expander, an outlet pipeline and a gas transmission pipeline are provided with the power source junction boxes and the pipeline electric tracing ribbons, the scroll type high pressure gas expander is connected with the electric generator through a concentric rotating shaft, the electric generator is connected with a wire inlet end of the transformer through an output circuit, the outlet pipeline and the power source junction boxes of the gas transmission pipeline are communicated with a wire outlet end of the transformer respectively, and the power source junction boxes are electrically connected with the pipeline electric tracing ribbons and supply electric energy for the pipeline electric tracing ribbons. According to the system, the own pressure of natural gas is utilized to be transformed into heat energy, the purposes of heat preservation and antifreeze are achieved finally, and no additional heating furnace or antifreeze agents are needed, and furthermore energy is saved, and the whole system is simple in structure and obvious in effects.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to an anti-freezing and blocking system for high-pressure gas production pipelines in condensate gas fields. Background technique [0002] Generally, during the exploitation of natural gas in condensate gas fields, due to the low density and viscosity of natural gas and large expansion coefficient, the pressure of natural gas is extremely high when extracted, sometimes even as high as 80MPa, and the pressure of natural gas pipelines is generally 7.5MPa. During the process, the temperature of the natural gas after throttling and depressurization at the wellhead drops, which may form natural gas hydrate with the associated water vapor, causing the pipeline to freeze and block. In order to allow the extracted natural gas to be collected and transported without freezing and freezing in the pipeline, it is necessary to install throttling and pressure-reducing devices and anti-freezing...

AI Technical Summary

Problems solved by technology

However, both of these two methods require a heating furnace to heat the pipeline in front of the expander to prevent the outlet of the expander from freezing. The heating process still uses an external heat source, and the pipeline at the outlet of the expander is not heated, which may cause the formation of natural gas hydrate. Risk of freezing pipes

The above methods have high requirements on external heat sources, are greatly affected by the environment, and have not comprehensively prevented pipeline freezing and blockage, so they cannot be widely used.

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