|
No.
|
Type
|
Code
|
English Description
|
Casing Size Range (OD)
|
Key Construction / Feature
|
Standard Materials
|
|
1
|
Bow-Spring Centralizer (Single-Bow)
|
BS-S
|
Forged / stamped bow-spring casing centralizer, single-layer bow springs. Non-welded hinged or slip-on one-piece design. Low starting force, high restoring force for vertical & moderate deviated wells, meets API-10D restoring force requirements.
|
4-1/2" ~ 20" (114.3 mm – 508 mm)
|
Hinged type / Slip-on integral type; single bow stack
|
Spring steel 65Mn, SAE-1070, alloy spring steel; end collars: carbon steel A106/A283
|
|
2
|
Bow-Spring Centralizer (Double-Bow)
|
BS-D
|
Double-layer bow-spring centralizer. Higher restoring force than single-bow, for high-angle deviated & horizontal wells, improves casing stand-off ratio.
|
4-1/2" ~ 20" (114.3 mm – 508 mm)
|
Hinged non-welded preferred; double bow stacks
|
Spring steel 65Mn, SAE-1070; end collar carbon steel
|
|
3
|
One-Piece Integral Bow-Spring Centralizer
|
BS-OP
|
Slip-on one-piece stamped centralizer, no hinge pins, no welding. Heat-treated monolithic structure, anti-fatigue, easy to slip over casing coupling-free pipe.
|
2-7/8" ~ 20" (73.0 mm – 508 mm)
|
Integral stamped body, slip-on installation
|
Spring steel 65Mn, alloy spring steel
|
|
4
|
Semi-Rigid Centralizer
|
SR
|
Semi-rigid compressible vane-type centralizer. Combines partial spring deflection & high structural strength; allows slight compression when passing tight hole sections, suitable for rotating casing operations during cementing.
|
4-1/2" ~ 13-3/8" (114.3 mm – 339.7 mm)
|
Cast / stamped vanes, limited elastic deformation
|
Cast carbon steel, low-alloy cast steel
|
|
5
|
Solid Rigid Centralizer (Straight-Vane)
|
RG-ST
|
Rigid non-spring integral centralizer with straight vanes. Fixed outer diameter, no spring deflection; positioned by stop collars / set screws, high impact resistance for heavy-load deviated wells.
|
4-1/2" ~ 20" (114.3 mm – 508 mm)
|
Solid cast / forged body, straight vanes
|
Cast carbon steel, cast aluminum alloy, A694 series
|
|
6
|
Solid Rigid Centralizer (Spiral-Vane)
|
RG-SP
|
Rigid spiral-vane centralizer. Helical vanes improve mud circulation & cement displacement; widely used for deviated / horizontal wells, reduce hole wall scraping.
|
4-1/2" ~ 20" (114.3 mm – 508 mm)
|
Spiral helical vanes, solid monolithic body
|
Cast carbon steel, cast aluminum alloy, A694 F42-F70
|
|
7
|
Roller Centralizer (Low-Torque)
|
RL
|
Rigid-body centralizer fitted with heat-treated rollers. Convert sliding friction to rolling friction, drastically reduce drag & torque; permit casing rotation & reciprocation in horizontal / high-angle wells.
|
4-1/2" ~ 13-3/8" (114.3 mm – 339.7 mm)
|
Spiral / straight vanes with alloy rollers; roller pins & bearings
|
Body: cast/alloy steel; Rollers: heat-treated alloy steel; NACE MR0175 optional for sour-service wells
|
|
8
|
Hinged Non-Welded Bow-Spring Centralizer
|
BS-HN
|
Hinged segmented bow-spring centralizer, zero welding on bow-to-collar joints, assembled by hinge pins & locking tabs. Convenient field mounting around casing couplings without sliding over casing end.
|
4-1/2" ~ 20" (114.3 mm – 508 mm)
|
Hinge pin construction, can clamp onto casing at any position
|
Bow: spring steel 65Mn / SAE-1070; Collar: carbon steel
|
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