Device and method for exploiting submarine natural gas hydrates

Abstract

The invention provides a device for exploiting submarine natural gas hydrates. The device comprises a methane collecting container (3), a carbon dioxide and methane separator (4), a pressurizer (5) and a warmer (6). The carbon dioxide and methane separator (4) is separately connected to the methane collecting container (3), a pressurizer (5) and a submarine extraction well (2) for separating a mixture of carbon dioxide and methane extracted from the seabed through the extraction well (2), feeds methane to the methane collecting container (3) and feeds carbon dioxide to the pressurizer (5) forpressurizing; the warmer (6) is connected to the pressurizer (5) to pressurize and warm a medium sent to a submarine shallow hydrate reserve through an injection well (1). The invention also providesa method for exploiting submarine natural gas hydrates. The natural gas hydrates are replaced and exploited by means of supercritical carbon dioxide successively formed by the pressurizer (5) and thewarmer (6), so that carbon dioxide can be recycled.

Description

technical field [0001] The invention generally belongs to the field of natural gas hydrate exploitation, and in particular relates to a device and method for exploiting seabed natural gas hydrate. Background technique [0002] Natural gas hydrate (NGH), also known as "combustible ice", is a clean energy with abundant reserves, mainly stored in the seabed or permafrost areas. It is estimated that the global carbon content of natural gas hydrate is 1×10 13 t, equivalent to twice the carbon content of proven conventional fossil energy (coal, oil and natural gas). my country is rich in natural gas hydrate resources. In May 2017, China successfully tested natural gas hydrates in the South my country Sea. In November 2017, the State Council officially listed natural gas hydrates as the 173rd mineral. Natural gas hydrates will become coal, oil, natural gas It is an important replacement energy source for conventional energy sources. Therefore, the development of natural gas hydrat...

AI Technical Summary

Problems solved by technology

As the replacement reaction proceeds, the formed carbon dioxide and methane mixed hydrate layer hinders further penetration of carbon dioxide into the hydrate reservoir to replace methane, the replacement rate decreases, the replacement cycle increases, and even the replacement reaction stops

Therefore, in order to solve the problems of slow replacement reaction, low replacement rate and long replacement period, a new method for natural gas hydrate replacement is urgently needed.

Images