Variable-diameter protection releaser of underground pressure tester

• Main Authors: LIU WENSHI, ZHENG JIYUAN, ZHANG YUXIN, ZHOU HUA, LONG CHANGHAI, GUO LIANG, WU ZEGUANG, WEI QINGQING, LIANG YAOWEN
• Format: Patent
• Language: Chinese; English
• Published: 06.06.2023
• 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 diameter-variable protection releaser comprises a connector, a locking sleeve, an upper positioning sleeve, a central pull rod, a telescopic piece, a lower positioning sleeve and a guide head, one end of the central pull rod is sleeved with the connector, the other end of the central pull rod is sleeved with the guide head, the telescopic piece is arranged on the periphery of the central pull rod, and the lower positioning sleeve is sleeved with the lower positioning sleeve. A gap is formed between the adjacent telescopic sheets before reducing, and the gap is closed after reducing; one end of the telescopic piece is connected with an upper positioning sleeve connected to the center pull rod in a sleeved mode, the other end of the telescopic piece is connected with a lower positioning sleeve connected to the center pull rod in a sleeved mode, the lower positioning sleeve is located in the guide head, and a locking sleeve connected to the center pull rod in a sleeved mode is arranged between the upper posi