NEWS Why the 20” S2 Centralizer is Becoming the Go-To Choice for Offshore Norway
As offshore drilling continues to evolve, operators in Norway are making a notable shift in their approach to intermediate casing centralization. Traditionally a stage where low-cost welded or mechanical centralizers were sufficient, the intermediate section is now being reimagined—driven by changing well profiles and more challenging trajectories. The result? A nearly 230% increase in demand for Centek’s 20” S2 ultra strong bow spring centralizer in the past 10 years in Norway.
This growing demand comes as operators move towards high-integrity single piece bow spring solutions. The reason is clear: what was once a predominantly vertical section is now being designed with increasingly higher inclinations—some as steep as 75%, although these remain uncommon. As inclination increases, so too does the challenge of maintaining centralization for heavy casing strings, making performance-critical single piece components like the S2 an operational necessity.
“We’re seeing operators rethink what’s required for intermediate casing.” said Shaun Mountain, Sales Manager for Norway and UK at Centek. “As well designs become more complex, they’re turning to the S2 20” because it offers the strength and flexibility needed to handle inclinations and heavy casing loads without risk. In these sections, it's now considered the default for offshore Norway and, in response to operator requests, we have developed several bespoke versions of the 20” S2 centralizer to meet the unique demands of specific well profiles.”
The Centek S2 20” centralizer is engineered for the most demanding offshore environments and rigorously tested to exceed API 10D 7th Edition standards. Available in slip-on or hinged configurations with 24” or 26” nominal IDs, the S2 outperforms expectations—achieving 10% and 15% above the minimum API stand-off requirements for the 20 x 24” and 20 x 26” configurations respectively, both with zero starting force.
With exceptional restoring force and proven mechanical strength, the S2 maintains stand-off even in high-inclination or restricted sections, holding heavy casing off the wellbore where performance matters most.
Why the S2 Stands Out
- Engineered strength and flexibility: With a single piece, heat-treated alloy steel body, jigsaw joint and proprietary heat treatment for high restoring force, the S2 delivers exceptional performance in high-load environments.
- Designed for tight restrictions: The S2 is proven to maintain stand-off even through tight annular clearances and complex wellbore paths.
- Field-proven reliability: Centek’s S2 range is tested to exceed API 10D requirements and has been used globally since its inception in 2001, in HPHT, extended reach, and deviated wells.
What’s emerging is a new standard: the Centek 20” S2 is fast becoming the preferred choice for offshore intermediate casing in Norway. It’s a clear signal that when well designs become more complex, the industry is prepared to move beyond “good enough” and invest in equipment that guarantees long-term performance and integrity.
Global Relevance: Where Else Could Benefit?
The offshore environments of Brazil, West Africa, and parts of Southeast Asia—including Malaysia and Indonesia—are presenting similar challenges to those seen in the North Sea. With increasing lateral sections and heavier casing loads in intermediate wells, the 20” S2 centralizer could play a critical role in improving cementing outcomes and overall well integrity in these regions.
We work closely with operators to provide custom simulations and develop bespoke designs for specific well conditions. If your project involves high inclination or restricted geometries in intermediate casing, our team can help validate performance with detailed modelling and technical consultation.
Contact us today to request a simulation.
Highlighted Case Study: Centek S2 centralizers are so robust that even after 800 ft. fall only one centralizer is damaged when pulled out of hole. Read more...
PRODUCTS USEDS2 Bow Spring Centralizer
Engineered for both high strength and flexibility, the patented S2 is a premium single piece bow spring centralizer developed for challenging wellbores