Supercritical carbon dioxide jet injection drilling exploitation hydrate device and method

Abstract

The invention belongs to the technical field of hydrate drilling exploitation equipment and processes and relates to a supercritical carbon dioxide jet injection drilling exploitation hydrate device and method. The supercritical carbon dioxide jet injection drilling exploitation hydrate device is adopted to realize exploitation of hydrate, a carbon dioxide storage device is filled with carbon dioxide firstly, then the carbon dioxide is continuously cooled to the liquid state via a storage tank cooling device, the liquid carbon dioxide is pressurized by a high pressure pump prior to be pumped into a drilling tool for jet drilling by the aid of the prior art, after the drilling tool drills into a hydrate reservoir, the jet temperature of the high-pressure supercritical carbon dioxide injected by a drill bit is lowered, the hydrate brought out of a wellbore and a near wellbore formation moves upwards along an annular space; after reaching a wellhead throttling device, the hydrate sequentially passes through a three-phase separator and a gas separator to spate natural gas and carbon dioxide so as to complete exploitation of the hydrate. The used device is simple in structure, convenient to operate, low in maintenance cost, simple in exploitation method, scientific in principle and safe in exploitation process.

Description

Technical field: [0001] The invention belongs to the technical field of hydrate drilling equipment and technology, and relates to a supercritical carbon dioxide jet drilling device and method for mining hydrates, in particular to a method for exploiting natural gas in hydrates by using supercritical carbon dioxide jet drilling. 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 ensu...

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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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