1. Introduction of downhole tools casing centralizer
The casing centralizers are used to protect sucker rod to reduce wearing.
2.1. Super strength spring steel
2.2. ASTM A395 ductile iron ,or equivalent international series number.
2.3. Polyester centralizer
2.4. Aluminum alloy
3.1. One or double bow without welding
3.2. Rigid type
3.3. Roller type
4″×5-7/8″, 4-1/2″×6-1/8″, 5″×61/2″, 5-1/2″×8-1/2″, 7″×8-1/2″, 7-5/8″×9-1/2″ , 8-5/8″×10-5/8″, 9-5/8″×12-1/4″, 10-3/4″×14-3/4″, 13-3/8″×17-1/2″, 16″×20″, 20″×26″
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