The Casing Centralizer is a device mounted on a casing string to center the casing string in the wellbore and is one of the casing attachments. The Casing Centralizer is divided into two types: rigid centralizers and spring centralizers. In addition to ensuring a certain thickness of the cement ring outside the casing string, the casing centralizer can also reduce the resistance when the casing is undercut, avoiding the stuck casing, and is beneficial to improving the cementing quality. A device in which a bow spring piece is spirally formed or a blade having a certain angle is welded in a spring centralizer to cause a swirling flow of the cement slurry is called a swirling spring centralizer.

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