Its function is the same as the spring-type casing scraper, but it can decrease and even avoid that the scraped pipe-column falls in oil well.
作用同弹簧式刮削器，但可减少甚至避免刮削管柱落井。
Its function is the same as the spring-type casing scraper, but it can decrease and even avoid that the scraped pipe-column falls in oil well.
作用同弹簧式刮削器，但可减少甚至避免刮削管柱落井。
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