Pipeline pig special for cleaning up blockage of hydrates in natural gas pipeline

Abstract

The invention belongs to the technical field of natural gas pipeline cleaning, and particularly relates to a pipeline pig special for cleaning up the blockage of the hydrates in a natural gas pipeline. The pipeline pig can be used for cleaning up the hydrates in the natural gas pipeline and has the self-blocking-removing function. The pipeline pig is composed of two separate components which can be used separately or in an assembled mode and comprises a friction system, a raw lime heating gas system, a safety system, and a backup power unit, the chisel function of the friction system can be used for cleaning up the sedimentation of the hydrates that do not completely blocks the circulation area and are attached to the pipe wall, and the cutting function of the friction system can be combined with the continuous friction function of the raw lime heating gas system so as to be capable of dealing with the hydrate blocking segment that completely blocks the circulation area. The pipeline pig has the advantages of being direct, thorough, easy to operate and economic and the like in dealing with various problems of the hydrate blockage in the natural gas pipeline.

Description

Technical field [0001] The invention belongs to the technical field of natural gas pipeline cleaning, and specifically relates to a pig that can be used to remove hydrate blockage in a natural gas pipeline and has a self-blocking function. Background technique [0002] Natural gas hydrate is a clathrate crystalline compound formed by water in natural gas and molecules such as methane, ethane, propane, isobutane, n-butane, nitrogen, carbon dioxide and hydrogen sulfide under certain pressure and temperature conditions. White crystals of loose ice or dense snow. Because natural gas hydrate is easy to cause blockage of the wellbore and gas pipeline, it will greatly affect the normal production of the gas field. Relevant studies have shown that during the operation of the Sulige Gas Field, hydrate blockage has become a major factor restricting production capacity in winter and causing potential safety hazards. [0003] At present, the method of injecting thermodynamic inhibitors (such...

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Problems solved by technology

[0004] At present, the existing pigs are mostly designed for oil pipelines, or for pigging under various environmental conditions. The simple cleaning method of peeling it off the pipe wall and pushing it forward is likely to cause more severe blockage of hydrates, not to mention that when the existing pipe pig faces a large volume and completely Weakness or even blockage when hydrates block the flow area

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