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Deployable Centralizers for Directional Drilling

Sandia National Laboratories

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Publications:

PDF Document Publication
Market Sheet
(308 KB)

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Sandia&#39;s centralizer can be deployed downhole in the retracted position (top image) and expanded against the walls of the casing when in place (bottom image)

Sandia's centralizer can be deployed downhole in the retracted position (top image) and expanded against the walls of the casing when in place (bottom image)

Technology Marketing Summary

Sandia National Laboratories has developed a robust centralizer that actively centers casing in deviated, directional or horizontally drilled well bores. Traditional centralizers, most commonly based on a bow spring design, are economically optimized for use in vertically drilled wells, however, they can lack sufficient force to centralize casing in deviated or directional drilled wells. This may result in variations in cement jobs and an improper seal that is prone to failure.

Description

Sandia’s deployable centralizer comprises two collars that are joined together by articulated linkage. Once the casing is situated downhole, a power source integrated in the collars is activated, drawing the collars together while forcing the linkage outwards towards the borehole walls. The resulting deployed structure is similar in final shape to a bow spring centralizer, however, it is powerful enough to properly support or displace the casing. Also, when deployed downhole in the retracted position, our centralizer alleviates drag and can transit through bends with less friction. Sandia’s deployable centralizer is a robust solution for directional or horizontal drilling to ensure a uniform 360° annular space around the casing and ensure a competent cement seal to the borehole wall.

Benefits
  • Active centralizer system
  • Large load carrying capability
  • No installation drag
  • Allows for complete concentric cement seal of casing to the borehole wall without variations in cement thickness
Applications and Industries
  • Oil & Gas
  • Geothermal
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 9,580,976
Patent
9,580,976
Deployable centralizers
A centralizer assembly is disclosed that allows for the assembly to be deployed in-situ. The centralizer assembly includes flexible members that can be extended into the well bore in situ by the initiation of a gas generating device. The centralizer assembly can support a large load carrying capability compared to a traditional bow spring with little or no installation drag. Additionally, larger displacements can be produced to centralize an extremely deviated casing.
Sandia National Laboratories 02/28/2017
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
SD#12513Prototype - Sandia estimates this technology at a Technology Readiness Level 3. Concept has been demonstrated analytically or experimentally.Available03/26/201803/26/2018

Contact SNL About This Technology

To: <ip@sandia.gov>