Centralizers

Maxi-Lizer Single-Piece Non-Weld Bow-Spring Centraliser
Robust centralisation for challenging wellbores

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The Maxi-Lizer is PDG’s next-generation single-piece, non-weld bow-spring centraliser, engineered to deliver high restoring force, low running drag and exceptional durability in today’s vertical, deviated and horizontal wells.

Manufactured as a one-piece unit with no welds between bows and end collars, the Maxi-Lizer eliminates traditional weak points, providing reliable performance in demanding casing-running and cementing operations.

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Product overview:

The Maxi-Lizer is designed to:

• Centralise casing and liners in open hole and cased hole environments

• Maximise stand-off to improve cement placement and zonal isolation

• Minimise friction and drag during running, even in high-angle sections

• Withstand high lateral loads without bow collapse or permanent deformation

Its optimised bow geometry offers the ideal balance between flexibility and strength, helping operators reach planned depth and achieve a high-quality cement job.

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Key benefits:

• Single-piece, non-weld construction

  • No welds or mechanical joints between bows and collars

  • Enhanced structural integrity and fatigue resistance

  • Reduced risk of bow failure in tight or tortuous wellbores

• High restoring force, low drag

  • Bow profile and heat treatment tuned for strong stand-off

  • Low starting and running forces to ease casing deployment

  • Supports improved cement coverage and reduced channelling risk

• Optimised for modern well profiles

  • Suitable for vertical, deviated and horizontal wells

  • Ideal for extended-reach and challenging onshore/offshore wells

• Durable materials and finish

  • Manufactured from high-strength spring steel

  • Special heat treatment for resilience and elastic recovery

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Design features:

• Slip-on single-piece body for simple installation and robust performance

• Precision-formed bows for consistent restoring force around the circumference

• Controlled bow height to achieve the required stand-off for a range of hole sizes

• Chamfered lead edges to aid smooth passage through tight spots and restrictions

• Compatible with PDG stop collars and accessories for secure placement on the string

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Typical applications:

• Primary cementing of surface, intermediate and production casing

• Vertical, high-angle and horizontal wells where stand-off is critical

• Wells with doglegs, ledges or washouts requiring reliable centralisation

• Onshore and offshore wells where robustness and durability are essential

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Sizes & configurations:

The Maxi-Lizer range is available for a wide selection of casing and liner sizes from 2 7/8" to 20" casing, with further sizes available on request.

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Options include:

• Different bow heights to match specific hole sizes and required stand-off

• Standard and high-performance variants for more demanding profiles

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Performance & standards:

• Designed in line with industry practices for API 10D centraliser performance

• Tested for starting force, running force and restoring force across relevant hole sizes

• Engineered to maintain stand-off while limiting drag during casing RIH and rotation