Bow-spring centralizer


Application

Steel bow-spring centralizers are designed for reliable centering of casing and liners while its running into the vertical, deviated and horizontal wells.

Centralizers provide uniform gap between the casing and the borehole wall, which improves the quality of the cementing of the main column and prevents screens damage during the running into downhole.

Benefits

  • Rigid undismountable design
  • Minimum value of the axial force while pushing the centralizer
  • The optimal value of the radial centering force
  • High dimensional accuracy
  • Uniform strength design providing accident-free application
  • Quick and easy installation
Size 114/144 168/216 245/295 324/394 426/508
Casing size, mm 114 168 245 324 426
Well bore
diameter, mm
144 216 295 394 508
Interior
diameter, mm
117,5 +3,2
-0,000
168,3 +3,2
-0,000
247,7 +3,2
-0,000
327 +3,2
-0,000
430,2 +3,2
-0,000
Outer diameter
min, mm
147,3 198,1 279,4 355,6 457,2
Outer diameter
max, mm
159,4 +0,000
-6,35
222,3 +0,000
-6,35
302,8 +0,000
-6,35
401,2 +0,000
-6,35
514,4 +0,000
-6,35
Total lenth, mm
(±1,3 mm)
457 457 457 457 457
Maximum pushing
force, kg
204 408 635 907 1089
Minimum
radial restoring
force, kg
435 817 907 726 817
Quality standard API 10D API 10D API 10D API 10D API 10D
Structure type Welded Welded Welded Welded Welded
Number of bows 4 6 6 8 8
Ring type Single part/
Split body
Single part/
Split body
Single part/
Split body
Single part/
Split body
Single part/
Split body