Concentric dual-tube separated injection CO2 tubular column and application method thereof

• Main Authors: MAO XIAONAN, ZHANG QUANSHENG, WANG SHIJIE, YUE GUANGTAO, HUANG ZHIHONG, HAN BO, LIU JIANXIN, YAN LILI, WEI WEI, WANG ZHIMIN
• Format: Patent
• Language: Chinese; English
• Published: 23.08.2019
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to the technical field of oilfield development gas injection, in particular to a concentric dual-tube separated injection CO2 tubular column applied to CO2 separated injection. According to the concentric dual-tube separated injection CO2 tubular column, a sleeve pipe, an outer pipe and an inner pipe are sleeved in succession, and an outer door, an upper packer, a gas separation valve, a lower packer and a gas injection valve are connected to the outer pipe in succession; the lower end of the inner pipe is firstly connected with an inner door and then is connected with the gas separation valve; and an inserting sealing mechanism, a locking mechanism and an anti-return mechanism are arranged in the gas separation valve. An application method of the concentric dual-tubeseparated injection CO2 tubular column comprises the steps that an outer tubular column is fed; the packers are packed; the inner pipe is fed to be inserted and sealed and is locked; gas is injected;an inner door press well