Annulus safety control device for multi-pipe production pipe column and using method of annulus safety control device

• Main Authors: JIA QINGSHENG, REN CONGKUN, SHI QIONG, NIE WENLONG, WANG XIN, TIAN JUN, ZHOU JINGCAI, GAO FENG, WEI XINCHEN, LI DEZHONG, HE QIQIANG
• Format: Patent
• Language: Chinese; English
• Published: 13.05.2022
• 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 annulus safety control device for the multi-pipe production pipe column comprises a sealing working barrel and an outer barrel structure, an annulus is formed between the outer barrel structure and the sealing working barrel, the outer barrel structure comprises a coupling, an upper connector, a piston sleeve, an upper connecting body, a lower connecting body and a lower connector, a piston cavity is formed in the piston sleeve, a piston is arranged in the piston cavity, and the lower connector is connected with the upper connector. A first step is arranged on the upper connecting body, a connecting sleeve is arranged at the bottom of the piston, a push rod is arranged at the bottom of the connecting sleeve, a spring is further arranged at the bottom of the connecting sleeve, and a multi-stage sealing mode with a leather cup self-sealing function and a split valve plate sealing function is further arranged in an annular cavity between the lower connecting body and the sealing working barrel. According to