UROS Offset Bow Spring Centralizer

UROS Offset Bow Spring Centralizer

The UROS is a unique, radically designed, offset bow centralizer offering reduced start and running forces in wells with under reamed sections where the main consideration is passage through previous set casing and expansion into the open-hole section.

The UROS is a robust, ultra-high-strength, single piece bow spring centralizer with no weak points. Its engineered strength and flexibility allow it to pass through tight annular restrictions while absorbing both axial and radial loading.

The UROS demonstrates >50% reduction on starting forces and running forces compared to traditional under ream products.

Under-reamed sections

Under reamed well sections create a number of engineering issues which affect the run-in-hole (RIH) performance due to the bows being ‘compressed’ while passing through smaller ID of the previous set casing.

The UROS is engineered to significantly reduce starting and running forces associated with under reamed well sections. Returning to gauge enhances RIH, stand-off and successful zonal isolation.

Features and benefits

  • Engineered for ultra-high-strength and flexibility
  • Returns to gauge in the open hole
  • Enhanced run-in-hole (RIH), stand-off and zonal isolation

Targeted applications

  • Under-reamed well sections
  • Tight annular applications
  • Offshore and deep-water
  • Highly deviated wells
  • Horizontal/ERD wells
  • S-Type/J-Type

UROS centralizer application guide

Stop collar

The UROS is available with a high performance stop collar.

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


UROS centralizers are available in sizes from 7 to 17"

For more information talk to our Product Service Experts today or use our Product Selector Tool to find the right product for your application.

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