Self-flow well sealing device

• Main Authors: SONG YUAN, WEI WEIWANG, CHANG LIANG, WEN MEIXIA, PENG HUI, ZHOU YANSONG, HE CHUN, YU JIE
• Format: Patent
• Language: Chinese; English
• Published: 24.03.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS; TESTING

The utility model discloses a self-flow well sealing device which comprises an outer shaft, an inner shaft, a sealing valve element and a drainage groove. The outer diameter of the inner shaft is smaller than the inner diameter of the outer shaft, the inner shaft is arranged in the outer shaft, and the outer wall of the lower end of the inner shaft is hermetically connected with the inner wall of the outer shaft; the sealing valve element comprises a sealing rod, a floating ball and a first limiting piece, a sealing cone and a guide column body are sequentially arranged on the sealing rod from bottom to top, the sealing rod is arranged in the inner shaft in a penetrating mode, the floating ball is fixedly connected with the lower end of the sealing rod, and the first limiting piece is detachably and fixedly connected with the upper end of the sealing rod and forms limiting with the upper end of the inner shaft; the drainage groove is formed in the outer wall of the outer shaft and communicates with the part,