Close Tolerance Centralizers

Close Tolerance 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 far superior roundness and ovality which allows for closer hugging of the casing and more importantly, less offset abutment with the contacting pad.

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. 

Centek close tolerance centralizers

  • Designed to challenge the traditional and extremely costly centralizer sub market.
  • Provides maximum stand-off in tight annulus applications.
  • Engineered to precise ring-gauge tolerances, because every millimeter saved allows for greater expansion in the open hole.
  • Low-profile design provides peak flow-by performance to reduce the surge effect common with narrow annular clearances as well as reducing ECD signatures.

Applications

Deepwater
Tight casing tolerances
Highly deviated wells
UR Wells Sections
Horizontal/ERD wells
Vertical-Wash Out Sections
S-Type/J-Type

Sizing

Centek close tolerance centralizers are available in sizes from 5" to 17 7/8"

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