Large-treatment-capacity hydrate downhole separation parallel device using spiral separators

Abstract

The invention discloses a large-treatment-capacity hydrate downhole separation parallel device using spiral separators. The problems that in the hydrate recovery process, sand production is serious, backfilling cannot be achieved, and an existing separation system is low in efficiency and insufficient in treatment capacity are mainly solved. The large-treatment-capacity hydrate downhole separationparallel device comprises a top short section, a parallel assembly, a bottom assembly and an integrated outer pipe which are sequentially connected; the parallel assembly comprises a parallel short section, a backfilling pipe, the corresponding spiral separator and an inner pipe which are sequentially connected; and the bottom assembly comprises a bottom short section, the corresponding spiral separator and a bottom inner pipe which are sequentially connected. According to the large-treatment-capacity hydrate downhole separation parallel device, the multiple spiral separators are connected inparallel in a pipe string, and thus the treatment capacity is greatly improved while the separation accuracy is guaranteed; and the multiple spiral separators are connected in parallel in the hydraterecovery pipe string, the working capacity of the whole separation system is greatly improved, the problem of large sand production amount of recovered hydrates is solved, sand backfilling is guaranteed, a reservoir is prevented from being collapsed, and equipment abrasion and the hydrate recovery cost are lowered.

Description

technical field [0001] The invention relates to the technical field of seabed natural gas hydrate exploitation, and relates to a large-capacity hydrate underground separation parallel device using a spiral separator. 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 natural gas h...

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Problems solved by technology

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

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