System and method for mining seabed combustible ice

Abstract

The embodiment of the invention discloses a system and method for mining seabed combustible ice. The system for mining the seabed combustible ice comprises a marine drilling platform, a subsea wellhead blowout preventer, a marine riser, a guide pipe, a surface sleeve pipe and a technical sleeve pipe, wherein the marine drilling platform is arranged at sea level, the subsea wellhead blowout preventer is arranged on the subsea mud line; the marine riser is arranged between the marine drilling platform and the subsea wellhead blowout preventer, and the upper and lower ends of the marine riser areseparately connected with the marine drilling platform and the subsea wellhead blowout preventer; the guide pipe is arranged in the vertical section of a main wellbore, the upper end of the guide pipe is connected with the subsea wellhead blowout preventer, and the lower end of the guide pipe is located above a combustible ice producing layer; the surface sleeve pipe is arranged in the vertical section and the deflecting section of the main wellbore, the upper end of the surface sleeve pipe is arranged in the guide pipe and connected with the subsea wellhead blowout preventer; and the technical sleeve pipe is arranged in the horizontal section of the main wellbore, the technical sleeve pipe is connected with the lower end of the surface sleeve pipe. The horizontal section of the main wellbore is arranged in the combustible ice producing layer. Branch wellbores extend from both sides of the technical sleeve pipe. The development cost of the combustible ice can be reduced.

Description

technical field [0001] The present application relates to the technical field of combustible ice mining, in particular to a mining system and method for seabed combustible ice. Background technique [0002] Energy and the environment in the 21st century are two major issues that people are paying more and more attention to. With the increasingly serious environmental problems and the depletion of energy problems in our country, reducing energy consumption and reducing pollutant emissions is the top priority. Combustible ice is a mixture of ice-like crystalline substances formed by freezing methane and water under high-pressure and low-temperature conditions. It looks like ice or solid alcohol. It is abundant in reserves, widely distributed, efficient and clean, and has broad prospects for commercial development. Geological survey experts said that China has abundant combustible ice reserves, higher than conventional natural gas resources, and has the conditions to become a c...

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Problems solved by technology

However, there are several deficiencies in this method: (1) Since the in-situ decomposition of combustible ice on the seabed requires the operation mode of lowering the pressure and increasing the temperature, it is difficult to guarantee the safety of mining; (2) mining combustible ice requires loading a large number of mining machines on the seabed, not only Exploitation costs will increase, and at the same time, it will cause damage to the marine ecological environment

Based on the above analysis, the development cost of combustible ice is high, so it is urgent for us to develop an effective technology for mining combustible ice to reduce the development cost of combustible ice

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