A method for safe mining of combustible ice in shallow seabed

Abstract

The invention provides a system and method for safe mining of combustible ice in the shallow seabed, which is carried out according to the following steps: determine the pre-development block; formulate the development plan of combustible ice; distribute a row of 5-6 horizontal well groups; Drilling at the position of the wellbore; slotting treatment around the wellbore after the drilling is formed; tripping out; replacing the completion fluid in the wellbore; injecting water at a temperature of 120°C-180°C and a pressure of 120°C-180°C into separate wells in 5-6 horizontal well groups Water vapor of 20MPa-30MPa; observe the water mist in the gas ejected from the wellhead; ignite; merge the wellhead gas into the gas outlet pipeline, according to the characteristics of the seabed topography, engineering geological features, and combustible ice reservoirs in the hydrate area, through Reasonable well location layout and decompression scheme can avoid environmental problems and disasters caused by methane leakage from engineering.

Description

technical field [0001] The invention relates to a system and method for safe mining of combustible ice in the shallow seabed, especially a system and method for overall development, reasonable pressure control, constant monitoring, orderly slowing down of seabed subsidence, and prevention of seabed depressions, landslides, tsunamis, and seawater poisoning in mining areas. Comprehensive supporting development technology for disasters and other disasters. The technical field belongs to the field of exploitation of marine oil and gas resources. Background technique [0002] Combustible ice is a solid substance mixed with water and natural gas. The main distribution areas of seabed gas hydrates in the world are the Gulf of Mexico in the Atlantic Ocean, the Caribbean Sea, the eastern continental margin of South America, the western continental margin of Africa and the eastern United States. The development of the Black Sea Platform off the coast is very difficult and risky, and ...

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Problems solved by technology

[0009] In order to overcome the existing methane leakage, which may cause geological disasters such as submarine landslides, or even cause environmental problems caused by methane leakage into the ocean or the atmosphere, the present invention provides a system and method for safe mining of combustible ice in the shallow seabed. Well arrangement mode of the group, optimization of drilling and completion mode, interval mining production system

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