Wall scraper

• Main Authors: CHI JUN, LIU JINLONG, JIANG ZHONGNAN, LU JUN'AN, ZHAO WEIDONG, QIU BIN, SHI XITIAN, WANG YANMIN, DING FENG
• Format: Patent
• Language: Chinese; English
• Published: 06.12.2019
• 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 provides a wall scraper, which belongs to the technical field of petroleum drilling and comprises a hollow shaft and at least one group of wall scraping components sleeved on the hollow shaft. The wall scraping assembly comprises an annular scraping piece, a sliding bearing and an annular pressing piece. The hollow shaft is sleeved with the annular scraping blade, a sliding bearing is arranged between the annular scraping blade and the hollow shaft, and a spring is arranged between the sliding bearing and the annular pressing scraping blade; the annular pressing piece comprises a first pressing ring, a second pressing ring and a plurality of pressing strips connected to the two ends of the first pressing ring and the two ends of the second pressing ring, and the first pressing ring and the second pressing ring are used for limiting axial displacement of the annular scraping piece along the hollow shaft. The pressing strip is used for limiting the radial displacement of the annular scraper al