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Increasing the Number of Centralizers Per Joint Can Dramatically Improve Rotation at TD

Centek /9th December 2014/ S2

In a horizontal well using 5½" casing with difficult mud conditions — which threatened liner running and cement placement — the operator needed reliable stand-off, low drag and sufficient casing mobility for rotation at total depth. Centek’s proposed solution: increase the number of its S2 bow-spring centralizers to three per two joints, ensuring high stand-off, centralization, reduced torque and minimal casing sag.

By increasing centralizer density — three S2 units per two joints — the operator achieved smooth rotation at TD (60 rpm), stable casing placement, and enhanced cement displacement under difficult mud conditions.

THE CHALLENGE

To successfully rotate the liner while cementing in the horizontal section using 5 1/2” casing in an unfriendly drilled manner for casing running with mud issues.

THE SOLUTION

Centek’s centralizer programme recommended 3 centralizers per 2 joints to ensure:

  1. a high stand-off ratio
  2. centralized casing
  3. reduced torque
  4. minimal casing sag

THE RESULT

Although there were unrelated mud issues to resolve that had a big impact on casing running for the first well, the casing was successfully rotated at 60rpm when on bottom at 16,676ft.

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Product Used

The revolutionary S2 bow spring centralizer is a high-performance, single-piece solution specifically designed for challenging wellbores.

Its engineered combination of strength and flexibility enhances run-in-hole (RIH) efficiency, reducing time and costs for operators aiming to reach total depth.

S2 Bow Spring Centralizer

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