A biased symmetrical parallel subsea shallow gas hydrate in-situ separation device

Abstract

The invention discloses a biased symmetric parallel subsea shallow gas hydrate in situ product separation device and mainly solves problems of small processing quantity and large pipe conveying energyconsumption of a separation device for hydrate exploitation. The device includes a lower connector, a separation short section A arranged at an upper end of the lower connector, a middle connector arranged at an upper end of the separation short section A, a separation short section B arranged at an upper end of the middle connector, and an upper connector arranged at an upper end of the separation short section B, wherein the connectors and the separation short sections are respectively provided with a drilling liquid flow channel, a liquid inlet flow channel and a liquid outlet flow channel, the drilling liquid flow channels are mutually communicated to form a drilling liquid and jet break channel, the liquid inlet flow channel are mutually communicated to form a parallel mixture slurryinlet channel, the liquid outlet flow channels are mutually communicated to form a purified hydrate recovery channel, and the middle connector and the lower connector are provided with sand discharging channels used for discharging separated mortar for refill. The device is advantaged in that large-scale processing, high efficiency and energy saving are realized, and relatively large practical and promotional values are realized.

Description

technical field [0001] The patent of the present invention relates to the technical field of deep-sea natural gas hydrate exploitation, and relates to an in-situ separation device for natural gas hydrate in the shallow seabed with offset symmetry and parallel connection. Background technique [0002] Natural gas hydrate is an ice-like solid crystalline substance formed by hydrocarbon gas molecules such as methane and water molecules under certain temperature and pressure conditions, commonly known as combustible ice. Natural gas hydrate, especially the shallow seabed hydrate, has huge reserves and is a clean and high-quality energy source, which will play an important role in the future energy strategy. [0003] At present, the traditional mining methods mainly include depressurization method, thermal shock method, chemical reagent method, etc. These methods are high in cost and easily cause environmental pollution, so they are not suitable for commercial exploitation of sea...

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Problems solved by technology

[0004] After the mixed slurry is pumped away, it is easy to cause geological disasters such as seabed collapse, and finally lead to pollution of the seabed environment

The separation devices in the prior art are mostly oil-water separation and gas-liquid separation, which separate the mixed slurry on the ground or sea platform, which will increase the energy consumption of the mixed slurry during pipeline transportation, and at the same time directly transport The mixed slurry with extremely high sand content causes huge erosion to the lifting system, which seriously affects the service life and increases the mining cost. When hydrates are produced, the space in the wellbore is limited, the radial space of the wellbore is small, and the processing capacity of a single separator is small, which often fails to meet the requirements of the production capacity.

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