A supercritical carbon dioxide jet jet drilling device for hydrate production

Abstract

The invention belongs to the technical field of hydrate drilling and production equipment and technology, and relates to a supercritical carbon dioxide jet jet drilling drilling hydrate mining device. The supercritical carbon dioxide jet jet drilling drilling hydrate mining device is used to realize the mining of hydrate. The liquid carbon dioxide storage device is continuously cooled to a liquid state by the storage tank refrigeration device. The high-pressure plunger pump pressurizes the liquid carbon dioxide and then pumps it into the drilling tool for jet drilling. After the drilling tool penetrates into the hydrate reservoir, the drill bit The temperature of the ejected high-pressure supercritical carbon dioxide jet is lowered, and the hydrates carried out of the wellbore and formation near the wellbore return upward along the annular space; after the hydrate reaches the wellhead throttling device, it passes through the three-phase separator and the gas separator to separate natural gas and gas. Carbon dioxide is used to complete the mining of hydrates; the device used by it has simple structure, convenient operation, low maintenance cost, simple mining method, scientific principle, and safe mining process.

Description

technical field [0001] The invention belongs to the technical field of hydrate drilling and production equipment and technology, and relates to a supercritical carbon dioxide jet jet drilling and production hydrate device. Background technique [0002] Gas hydrate is a crystalline solid composed of water and natural gas molecules. A large amount of natural gas is trapped in gas hydrate reservoirs. Under standard conditions, 1 volume of gas hydrate can release 160-180 volumes of natural gas. Gas hydrates are found in permafrost regions on Earth and in marine sediments on continental margins. The global resources of natural gas hydrate are huge, and it is an important potential alternative energy source. The efficient development of natural gas hydrate is of great help to alleviating the current increasing energy shortage, meeting the growing energy demand, and even ensuring national energy security. is of great significance. [0003] Currently, natural gas is extracted from...

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Problems solved by technology

[0003] Currently, natural gas is extracted from gas hydrates using standard techniques used in conventional oil and gas extraction, namely, reservoir depressurization, thermal stimulation, and injection of hydrate inhibitors, resulting in the decomposition of gas hydrates However, the drilling fluid used in the drilling process of the above method contains water phase. When drilling into the hydrate reservoir, the water in the pore space of the hydrate deposit can easily form hydrate again with the decomposed natural gas, preventing Cut off the decomposition path of gas, resulting in reduced production of hydrate reservoirs and reduced ultimate recovery

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