Multiple-stage separator

Abstract

The invention provides a multiple-stage separator. The multiple-stage separator comprises a drilling fluid injection system, an exploitation mixture return system and a hydrocyclone separation systemplaced between the drilling fluid injection system and the exploitation mixture return system. The multiple-stage separator has the advantages that the handling capacity is large, tube plugging is notprone to occurring, and the structure is simple; and the multiple-stage separator has high application value and aims to solve the problem of sediment backfill in the process of natural gas hydrate fluidization exploitation, thus stabilization of a seabed layer is ensured, and accidents of tsunamis and the like caused by seabed cavitation due to the fact that the seabed sediment cannot be separated are avoided.

Description

technical field [0001] The disclosure relates to a downhole cyclone separator, in particular to a multistage separator used for in-situ sediment backfilling of natural gas hydrate. More specifically, the present disclosure relates to a multi-stage separator for in-situ sediment backfilling of gas hydrates and its application. Background technique [0002] Natural gas hydrate, also known as combustible ice, is a clathrate crystalline compound formed by wrapping hydrocarbon gas molecules such as methane with water molecules under low temperature and high pressure environment. Because of its wide distribution range, large reserve scale, high energy density and low environmental pollution , Gradually become an important emerging clean energy and occupy an important position in the future energy strategy. [0003] At present, natural gas hydrate exploitation mainly adopts depressurization, heat injection, agent injection, displacement and other methods, and the depressurization ...

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Problems solved by technology

[0008] The present disclosure provides a novel multi-stage separator for in-situ sediment backfilling of natural gas hydrate, which solves the problems of low separation efficiency, small processing capacity and easy blockage in the prior art

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