Centralizer Subs

Overview

With the energy industry’s challenging and demanding performance requirements, Top-Co’s Centralizer Subs are designed to withstand the most extreme deepwater down hole conditions. Manufactured from mechanical stock tubing, the centralizer subs are designed to perform in wells containing tight clearances and under-reamed hole sections. Additionally, Top-Co’s customization capabilities allow the sub design to match the exact needs of most well and casing programs. Combined with Top-Co’s expert Applications Engineering team and the simulations offered, the centralizer subs meet specific well requirements, as well as overcome common drilling challenges.

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Product Catalog

Top‐Co’s Type 360 ‐ D2® (D Squared) Bow Spring Centralizer Sub is covered by US Patent 3484803 /7140432 & Trademark 72186499

Type 360 – D2® Centralizer – Sub, Integral/Bow Spring

Designed for use in deepwater wells where tight wellbore restrictions and under-reamed sections are encountered. The D2® model is particularly well suited for applications that require additional protection to the bow spring while running casing, and applications with uncertain or high levels of side force.

Features:

  • Solid vanes machined on the OD of a tubular sub over which a bow spring centralizer is placed.
  • Notched bow spring collar: Bow springs are welded into the notches, resulting in a flush profile reducing minimum compressed OD.
  • Full scale tests show bow springs cause no damage to the subsea casing hanger seal surfaces.

Advantages:

  • Compression of the bow springs between the vanes ensures their protection when going through dog legs and tight clearances.
  • The solid vanes guarantee a minimum standoff when higher than expected side forces are encountered.
  • Stress caused by inadvertent rotation is distributed evenly around the collar instead of being concentrated on a single bow, reducing the risk of failure.
  • Vane dimensions are customizable to increase flow by area and standoff.
  • Particularly well suited for reciprocation.
  • The centralizer will stay in place due to the notched collar design.
  • Guaranteed stand-off that will lead to improved mud displacement and cementing.

Type 361 – Rotobo® Centralizer – Sub, Integral/Bow Spring

Designed to withstand the most extreme deepwater down hole conditions. Top-Co’s customization capabilities allow the sub design to match the exact needs of most wells and casing programs.

Features

  • Welded bow spring centralizer installed over integral shoulders which are machined into the sub.
  • The centralizer is free to rotate about the sub’s axis.

Advantages

  • Ability to rotate the casing string without damaging the bows or centralizer sub.
  • Allows for improved mud removal and cement placement through casing rotation.
  • Increased flow by area.
  • Lower cost.
  • Customization of bow-spring type and quantity

 

Type 362 – SuperCombo™ Centralizer – Sub, Integral/Bow Spring

Particularly well suited for applications where the user desires machined vanes for guaranteed stand-off and protection of the bow spring – especially with uncertain or high levels of side forces – combined with the ability to rotate the casing string.

Features

  • Welded bow spring centralizer installed over integral shoulders which are machined into the sub.
  • Machined vanes (either spiral or straight) can be placed above and/or below the centralizer.

Advantages

  • Ability to rotate the casing string without damaging the centralizer sub.
  • The solid vanes guarantee a minimum stand-off when higher than expected side forces are encountered.
  • The solid vanes provide protection to the bow spring centralizer.
  • Improved mud displacement and cementing.
  • Additional fluid agitation.
  • Customizable blade angle and blade length.
  • Customizable bow spring type and quantity independent of the machined vanes.

 

Type 229 – Rigid Inline Centralizer – Sub

Designed for versatility in both land and deepwater application with tight clearance designs where standard slip-on solid body centralizers cannot meet drift requirements or performance requirements.

  • Rotation can help to overcome drag.
  • Well suited to overcome concerns with extremely tight holes to ensure proper standoff for cementing.
  • Improved mud removal and cementing in extremely tight clearances.