Ocean natural gas hydrate novel in-situ separation mining method and device
A technology of in-situ separation and mining methods, applied in the fields of mining fluids, drilling equipment and methods, and earth-moving drilling and mining, etc., can solve the problems of difficult processing, low structural strength of backfilling sediment, disasters, etc. The effect of energy consumption, saving industrial mining cost and preventing geological disasters
Pending Publication Date: 2019-08-27
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The shallow solid fluidization mining method requires a separate separation module, crushing module and recovery module. The overall structure is complex, the processing is difficult, and the cost is high; and the backfill device cannot be installed near the drill bit, otherwise the backfill channel is narrow and long. The low strength of the sediment structure can easily cause the collapse of the reservoir, and even cause the collapse of the hydrate layer and cause site disasters, which is not conducive to commercial mining
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[0017] Typical embodiments embodying the features of the present invention will be specifically explained in the following description. It should be noted that the present invention can have different changes in different embodiments, and this embodiment and the accompanying drawings are only for illustration, and are not intended to limit the present invention.
[0018] The embodiment of the present invention is used for a new in-situ separation and exploitation method of marine natural gas hydrate, which includes the following steps:
[0019] Step S1: The lower riser 2 is lowered from the sea surface primary treatment platform 1, and after being lowered to the seabed, the intelligent steerable drilling bit 10 leads the whole system to continue drilling to the covering mud layer above the hydrate reservoir, and the packer 4 is installed at this time , which is fixed on the outer side of the riser 2 to separate the mining area below from the seawater. The intelligent directio...
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The invention discloses an ocean natural gas hydrate novel in-situ separation mining method and device and belongs to the technical field of ocean natural gas hydrate exploitation. The method mainly comprises the following steps of descending a waterproof guide pipe to the location above a hydrate mineral layer and conducting mechanical crushing through a drill to continue drilling to form a vertical pilot hole; pulling a drill column back, and conducting crushing on the hydrate mineral layer through jet flow holes arranged in the tangential direction, wherein jet water forms a high-speed swirling flow field in a mining cavity, hydrate particles and impurity sand particles are layered under the action of centrifugal force to realize in-situ separation, and the impurity sand particles located on the outermost layer are filled back into the cavity; and recovering and pumping separated hydrate and seawater up to the sea surface. Through the ocean natural gas hydrate novel in-situ separation mining method, in-situ crushing, separation and backfill integrated operation of the shallow hydrate on the seafloor is realized, efficient, safe and continuous mining can be implemented, and whileensuring the mining efficiency, the complexity of mining tools is effectively reduced, and the backfill stability is improved.
Description
technical field [0001] The invention relates to the technical field of marine natural gas hydrate exploitation, in particular to a method and device for in-situ separation and backfilling jet production of marine shallow natural gas hydrate. Background technique [0002] Gas hydrate, known as "combustible ice", is an unconventional energy source with high density and high calorific value. According to statistics, the carbon content of the total resources of natural gas hydrates in the world is equivalent to twice the total reserves of known coal, oil and natural gas resources in the world. The prospect of marine gas hydrate resources in my country is very broad. The total resources of gas hydrate in the South China Sea alone is equivalent to about half of my country's total land and offshore oil and gas reserves. [0003] At present, there are four known natural gas hydrate storage forms, which are sandstone type, sandstone fracture type, dispersed type, and fine-grained fr...
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Login to View More IPC IPC(8): E21B43/01E21B7/18
CPCE21B43/01E21B7/185E21B41/0099
Inventor 王凡王国荣邱顺佐冯桂弘王广申钟林
Owner SOUTHWEST PETROLEUM UNIV