Multi-functional blocking device at tail end of continuous gas production pipe and use method of multi-functional blocking device

• Main Authors: XIAO SHUQIN, YANG XUDONG, XIE YONGGANG, WEI YAMING, BAI XIAOHONG, TIAN WEI, WANG XIAORONG, GUI JIE, HAN QIANGHUI, ZHAO BINBIN
• Format: Patent
• Language: Chinese; English
• Published: 16.06.2023
• 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 belongs to the technical field of oil-gas field exploitation, and particularly relates to a multifunctional blocking device at the tail end of a continuous gas production pipe and a using method. In the process that the continuous gas production pipe is put into a shaft, a tail end plugging device is adopted to plug the interior of a pipe column, under-pressure operation is achieved, and after the designed depth is reached, a tail pipe plug is removed to achieve pipe column drainage gas production; during throttling gas production, the throwing-in and pulling type throttler is set in the tail end plugging device, underground throttling production in the initial stage of gas well production is achieved, the throwing-in and pulling type throttler is salvaged in the later stage, and liquid-carrying production is conducted; in the later stage of the gas well, the self-buffering plunger is put into the pipe column at the wellhead, and plunger drainage gas recovery in the intermittent production perio