QW50A气动卡瓦是油田修井作业时，安装在井口上用于卡紧油管及类似管柱的一种工具。
Model QW50A Air Operated Slips is a wellhead tools. Mainly used to clipping tubing and drilling rod which raise or put down at well repairing service operation.
新型气动卡瓦体的工作高度低，可自动刮泥，并具有安装操作简便、自动化程度高、悬挂能力大等特点。
The applications in the field shows its advantages as simple installation and easy operation, high automation, avoiding safety emergency, lessening hard work, scraping the drilling mud off.
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