Centralizers

Close Tolerance Centralizers & Subs

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In today’s complex well designs, tight annulus and restricted bore sections demand far more than conventional centralization solutions. PDG has developed a dedicated range of Close Tolerance Centralizers and Centralizer Subs, the T.A.C.T.S. range, engineered to perform reliably in high-risk, dimensionally constrained environments where precision, strength, and control are critical.

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Designed for deep-water, ERD, slim-hole and restricted-ID applications, PDG’s close tolerance solutions combine advanced materials, precision manufacturing, and rigorous testing to deliver dependable centralization without compromising run-in-hole capability.

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Engineered for Extreme Tight Annulus Conditions

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PDG's T.A.C.T.S. are purpose-built to pass through the narrowest restrictions while maintaining effective casing centralization. Unlike standard bow-spring or rigid designs that struggle in reduced clearances, PDG’s products are manufactured with strict dimensional control and optimised geometry to ensure smooth passage, controlled drag, and predictable performance.

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These tools are particularly suited for:

• Tight clearance casing strings

• Deepwater and offshore wells

• Extended reach and high-angle sections

• Wells with multiple restrictions or liners

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Precision Manufacturing – Not Modified Standard Products

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PDG's close tolerance solutions are designed from first principles, not adapted from standard centralizers. Manufacturing is carried out using precision laser cutting, controlled forming, and bespoke expansion tooling to achieve repeatable stand-off and dimensional accuracy.

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Key manufacturing advantages include:

• Single-piece alloy steel construction for strength and reliability

• Precision laser cutting to tight tolerances

• Controlled forming and expansion to maintain consistent OD

• Fully heat-treated components for mechanical integrity

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This approach ensures repeatability, reliability, and confidence when operating in wells where tolerances leave no margin for error

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Centralizer Subs – Performance Where Conventional Tools Fail

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PDG's Centralizer Subs are engineered for extreme close tolerance applications where traditional centralizers are no longer viable. The sub-based design allows the tool to rotate within the tight annulus, reducing friction and enabling passage through the most restrictive well sections.

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Each Centralizer Sub is:

• Machined from high-strength alloy steel

• Designed to meet required tensile, collapse, and burst ratings

• Available with premium threaded connections to customer specification

• Optimised for deep-water and demanding offshore environments

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This makes PDG's Centralizer Subs a robust, engineered solution for critical casing runs where operational risk must be minimised.

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Tested, Verified, and Fully Supported

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All of PDG's close tolerance centralizers are developed with API 10D – 7th Edition performance requirements in mind and supported by in-house testing, material verification, and traceability systems. PDG’s technical team also provides centralizer placement and spacing simulations, helping operators optimise tool selection and achieve the required stand-off with confidence

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Why Choose PDG T.A.C.T.S range?

• Purpose-designed for tight annulus and restricted ID wells

• Precision-manufactured, not modified standard products

• High-strength alloy steel construction

• API-aligned testing and full traceability

• Engineering support from design through execution

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When tolerance is tight and failure is not an option, PDG's T.A.C.T.S. range provide the control, reliability, and assurance required to deliver successful casing and cementing operations.