Close Tolerance Bow Spring Centralizers

Close Tolerance Bow Spring Centralizers

With innovative single-piece construction, premium steel alloy, and jigsaw joints, Centek close tolerance centralizers contribute to greater well productivity by ensuring an enhanced cementation job in deepwater wells.

As leading innovators in centralizer design, Centek understands the need for a close tolerance centralizer for use in tight annulus applications, where narrow margins between pore pressure and the fracture gradient exist. In deepwater operations centralizers must compress virtually flat to allow travel through a series of tight casing strings but still be capable of expanding to the designed open-hole size.

The endbands (or rings) on Centek close tolerance centralizers are manufactured to very tight tolerances where the ID of the centralizer is only 0.030 in. over the maximum casing OD. They are also manufactured with superior roundness which allows for closer hugging of the casing.

Centek close tolerance centralizers are designed with a precisely formed cross bow curvature so there are no “knife edges” (common among standard bow spring centralizers) as the bows are inserted into a subsea well head or supplemental adapter in deepwater drilling operations reducing the risk of subsea well head damage. This also adds additional strength to the bows.

The rugged, single piece design of Centek close tolerance centralizers ensures no point loading of a single bow (common among welded/integral lock bow spring centralizers) occurs during RIH. Centek close tolerance centralizers evenly distribute the axial and radial loads throughout the entire unit as they are applied during close tolerance casing running operations.

Centek close tolerance centralizers are available in UROS-CT, TUR-CT and TUR HD-CT design. 

Features and benefits

  • Low-profile design provides peak flow-by performance to reduce the surge effect
  • Designed to challenge the traditional and extremely costly centralizer sub market
  • Engineered to precise ring-gauge tolerances, because every millimeter saved allows for greater expansion in the open hole

Targeted applications

  • Under-reamed wells sections
  • Tight casing applications
  • Deepwater
  • Highly deviated wells
  • Horizontal/ERD wells
  • S-Type/J-Type

Performance ratings

Centralization and the ease of running casing is often a balance between strength and flexibility which combine to support, what we call, 'runability'. To help with product selection we've added a rating to all our products for flexibility, runability and inherent strength.


Centralizer ratings


Centek close tolerance centralizers are available in sizes from 11 3/4" to 17"
For more information talk to our Global Sales team today or use our Product Selector Tool to find the right product for your application

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