Method for integrating ocean carbon dioxide storage and hydrate replacement exploitation

• Main Authors: ZHOU XUEQING, LIU YANRUI, WU SHIGUO, CHEN YUAN
• Format: Patent
• Language: Chinese; English
• Published: 07.06.2024
• Subjects: BLASTING; CHEMISTRY; COMPOUNDS THEREOF; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES; FIXED CONSTRUCTIONS; FIXED-CAPACITY GAS-HOLDERS; HEATING; INORGANIC CHEMISTRY; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; MINING; NON-METALLIC ELEMENTS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; STORING OF DISTRIBUTING GASES OR LIQUIDS; VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES; WEAPONS

The invention belongs to the field of environmental protection, and particularly relates to an ocean carbon dioxide storage and hydrate replacement mining integrated method which comprises the steps that carbon dioxide is injected into a shallow sea seabed sedimentary layer through an ocean drilling platform and a multi-branch horizontal well, and natural gas hydrate replacement mining is mainly adopted in the early stage; and middle-stage replacement exploitation and carbon dioxide sealing are both considered, the other branch of the injection well is opened after the hydrate in the later stage is depleted, and sealing of carbon dioxide in the depleted hydrate deposition layer and the deep salt water layer is achieved. According to the method provided by the invention, replacement mining of the marine hydrate can be realized, certain economic benefits can be obtained, the problems of stratum settlement and sand production caused by hydrate decomposition can be avoided to a certain extent, meanwhile, carbon d