| 摘要 |
A casing centralizer having a pair of longitudinally spaced collars adapted to be assembled about a conduit, and a plurality of outwardly bowed springs extending longitudinally between the collars. Each collar has internal and external upsets formed therein. The external upsets are generally U shaped to receive the end of the bow spring. Each bow spring has an opening at each end thereof adapted to receive the internally upset material, with the internally upset material so formed to extending into the bow spring opening thereby locking the end portion of the bow spring within the externally formed U shaped upsets.
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