Gas injection device for gas-driven casing damage repair well, underground sealing working barrel and construction method

• Main Authors: MAO XIAONAN, JIANG GUANGBIN, ZHU YINGHUI, LI GAN, LIU JIANXIN, YAN LILI, LIU YUGUO
• Format: Patent
• Language: Chinese; English
• Published: 07.11.2023
• 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 discloses a gas injection device for a gas-driven casing damage repair well, an underground sealing working barrel and a construction method. The gas injection device is provided with a central pipe, a pawl barrel and a positioning barrel, a reversing rail is arranged outside a pipe body of the central pipe, a sliding pin is installed in a sliding ring, the sliding ring is installed in a sliding ring protective sleeve, and the sliding pin in the sliding ring is arranged in the reversing rail of the central pipe; the two ends of a sealing inserting cylinder provided with a sealing piece are connected with the pawl cylinder and the positioning cylinder respectively and connected with a lower connector installed at the lower end of the center pipe through the positioning cylinder, and the maximum outer diameter of the gas injection device is smaller than the inner diameter of the reinforcing and patching well section. A working barrel sealing face, a pawl clamping table limiting cavity, an insertio