Integrated hydrate down-hole in-situ separation parallel-connection device with large treatment capacity

Abstract

The invention discloses an integrated hydrate down-hole in-situ separation parallel-connection device with the large treatment capacity. The problems that in the mining process of hydrates, sand production is serious, and existing separators are low in separation efficiency are mainly solved. The integrated hydrate down-hole in-situ separation parallel-connection device comprises a top short section, parallel-connection assemblies, a bottom assembly, a lower plug and an outer pipe which are connected in sequence, wherein the multiple parallel-connection assemblies can be mounted simultaneously, or no parallel-connection assembly is mounted, the parallel-connection assemblies each comprise a parallel-connection short section, a backfill pipe, a separator and an inner pipe which are connected in sequence, and the bottom assembly comprises a bottom short section, a backfill pipe, a separator and a bottom inner pipe which are connected in sequence. According to the integrated hydrate down-hole in-situ separation parallel-connection device, the multiple separators are connected into an integrated outer pipe string in parallel, and the large treatment capacity is achieved while the separation precision is ensured; and the multiple separators are connected in parallel in a hydrate mining pipe string, the working capacity of the separators is greatly improved, the problem of the largesand production amount of the mined hydrates is solved, sand backfilling is ensured, the situations that reservoir collapse occurs, the pipe conveying efficiency is lowered, and equipment abrasion iscaused are prevented, and the mining cost of the hydrates is lowered.

Description

technical field [0001] The invention relates to the technical field of subsea natural gas hydrate exploitation, and relates to an integrated underground hydrate in-situ separation parallel device with a large processing capacity. Background technique [0002] Natural gas hydrate, also known as combustible ice, is an ice-like solid compound formed by methane-based hydrocarbon gas and water under certain temperature and pressure conditions. The global natural gas hydrate reserves are huge, and it is a clean and high-quality energy, which occupies an important position in the future energy strategy. [0003] At present, the traditional mining methods mainly include thermal stimulation method, decompression method, chemical reagent method, and carbon dioxide replacement method. These methods are only suitable for natural gas hydrate reservoirs with good cap rocks, and have certain limitations. The "solid-state fluidization" mining method is a new mining idea for non-diagenetic ...

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Problems solved by technology

[0008] The content of the present invention is to provide a large-capacity integrated downhole in-situ separation parallel device for hydrate, which solves the problem of insufficient processing capacity of a single separator in the hydrate production pipe string in the prior art and cannot effectively separate the hydrate raw slurry. mud and sand problem

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