Self-locking lower rubber plug grouting device

• Main Authors: CHEN BIN, XU YANG, ZHU CHUNGENG, PENG JINLONG, HAN SHUANGYAN, YAO WENQIANG, WANG CHONG, YAN LIANGUO, LI QUANSHUANG, LIU JUNKANG
• Format: Patent
• Language: Chinese; English
• Published: 17.12.2021
• 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 utility model relates to a self-locking lower rubber plug grouting device which is characterized in that a column body is arranged at the upper part of a core shaft of a lower rubber plug body, a plurality of leather cups are arranged on the periphery of the column body, and an inflatable rubber ring is embedded in the inner wall of each leather cup; a ball head is arranged at the lower end of the mandrel, a mandrel sealing section is arranged above the ball head, a plurality of mandrel sealing rings are embedded in the circumference of the mandrel sealing section, and a self-locking mechanism is arranged above the mandrel sealing section; the self-locking mechanism comprises mandrel counter bores symmetrically arranged along the radius of the mandrel, outer ports of the two mandrel counter bores are connected with mandrel counter bore sealing covers in a screwed mode respectively, self-locking springs are symmetrically arranged in the two mandrel counter bores, pressing plates are arranged at the outer e