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Internal centralizers

Centralizers to minimise the risk of buckling

Lifecycle stage
Drilling Production
Product or Service
Product Service

Structural internal centralizers are run on internal strings where a standard cementing (bow-type) centralizer is inadequate as indicated by riser and completion analysis. This type of centralizer is required when there are concerns over the structural integrity of the inner strings and when the analysis shows a risk of buckling.

Claxton’s internal centralizers are constructed in two halves, with two joining flanges on each half for easy installation around plain casing.

The design considers the effect of test pressure in the inner casing as well as the medium they will be exposed to throughout their life. Internal centralizers are commonly designed for radial loads between 5-10 tonnes but they can also be designed for high lateral loads of over 20 tonnes. The annulus medium is also considered when specifying the fasteners and coating to be used for the design.

Centralizer Internal Main 1

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Centralizer Internal Main 2

Internal centralizers are required when there are concerns over the structural integrity of the inner strings and when the analysis shows risk of buckling.

Centralizers buyers guide Centralizers buyers guide
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Centralizers Buyers Guide

Download Claxton’s centralizer buyers guide for in-depth details on finding a bespoke solution for even the most challenging centralization projects.

Asset life extension case study pack Asset life extension case study pack
E-book download
Asset Life Extension Case Study Pack

Download the Claxton structural asset life extension case study pack for details on slot recovery techniques, centralizers, replacement platform guides and other bespoke solutions.

Ann Vicens BW - 590x620

Our expert view

Internal centralizers, although appearing simple, need careful analysis during their design to make sure the units will stay in place after the pressure testing of internal stringsWe pay careful consideration to the sizes to allow sufficient running clearance.

Ann Vicens - Product Leader for Centralizers & Asset Life Extension, Claxton