近几年来,如何改进油、气井大、小修装备的问题已日益引起人们关注,这是因为所采用的装备效果不好。 在进行修井的时候,常常会提出进行打捞作业的要求——把落在井内的油管或油杆捞上来。对于打捞油管作业,广泛采用带有板牙式夹卡部件的打捞筒。这些打捞筒的夹卡原则是相 In recent years, the issue of how to improve large and minor repairs of oil and gas wells has drawn increasing attention. This is because the equipment used has not been effective. When working on a well, it is often the case that a request for salvage operations is made - to retrieve the tubing or rod that falls in the well. For the salvage of tubing operations, extensive use of the jaws with clip-type parts of the overshot. These overshot clamp principle is phase