Mechanical-thermal hydrate exploiting method

A technology for hydrate and hydrate sediments, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve the problems of limited decomposition range, consumption, and low production efficiency, and achieve high convective heat transfer efficiency and avoidance of The effect of leakage and high mining efficiency

Inactive Publication Date: 2013-04-03
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

Since the decomposition of hydrate needs to absorb a large amount of heat, and the formation consumes more than 90% of the injected heat, the range of hydrate decomposition around the production wellbore is limited, the production efficiency is not high, and it is difficult to meet the requirements of commercial production

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  • Mechanical-thermal hydrate exploiting method

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Embodiment Construction

[0028] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0029] Mechanical-thermal mining of hydrate is a new mining method proposed in view of the slow heat transfer efficiency and low mining efficiency of existing mining methods. Its basic idea is to excavate hydrate formations with mechanical equipment and The hydrate is crushed into particles; then in the pre-designed hydrate decomposition chamber, the supply of hot seawater, the mixing of small particles and seawater, and the partial separation and backfill of sediments, hydrates, water and gas are carried out; Then the hydrate deposits, water, and gas are transported upwards along the production wellbore, and the hydrates decompose to produce gas and the sediments separate and s...

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Abstract

The invention discloses a mechanical-thermal hydrate exploiting method. The mechanical-thermal hydrate exploiting method comprises the following steps: excavating a hydrate stratum, crushing hydrate sediment into hydrate sediment granules, and conveying the hydrate sediment granules into a decomposing chamber; stirring and mixing relatively hot seawater and the hydrate sediment granules in the decomposing chamber, partially decomposing the hydrate sediment granules, separating the obtained mixture, and removing the separated sediment; upwardly conveying the remaining mixture along an exploiting shaft, further decomposing the hydrate in the mixture in the conveying process, and separating the remaining mixture and generated gas from the sediment in the mixture; and collecting the obtained gas on an exploiting platform. By the method, hydrate decomposing heat can be supplied by a huge heat source from seawater and convective heat transfer; expansion energy of gas which is generated in a centralized way can be made full use; backfill of the sediment can restore certain stratum strength; and leakage of the hydrate decomposing gas from a covering layer can be avoided.

Description

technical field [0001] The invention relates to a method for exploiting hydrate, in particular to a method for mechanically-thermally exploiting hydrate. Background technique [0002] Gas hydrate is an ice-like solid compound formed by natural gas and water under high pressure and low temperature conditions. Hydrate deposits are widely distributed in terrestrial permafrost environments and deep-water formation environments such as oceans and lakes. Hydrates are estimated to contain more than twice the carbon contained in known fossil fuels worldwide. my country has obtained hydrate sediment samples from the northern slopes of the South China Sea and the permafrost areas of the Qilian Mountains, which proves that my country has great potential for hydrate mining, and the research on hydrate mining has been included in the strategic development plan. [0003] At present, the hydrate production methods proposed in the world mainly include heat injection method, depressurizati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/38E21B43/24
Inventor 鲁晓兵张旭辉刘乐乐
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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