CASE STUDY Centek TUR Centralizers can pass through a restricted ID and then expand to their original diameter
The Centek TUR Centralizer can pass through a restricted ID and return to zero start and running forces and back to its original design.
To run centralizers on a 13 5/8” casing that are able to pass through the restricted ID of the 16” casing and then expand to 17 ½” in the next hole section to ensure proper centralization of the 13 5/8” casing string.
Traditional bow spring centralizers are not designed to be severely compressed, passed through smaller bore pipe and then expand to their original design diameter. Bow string centralizers are damaged/deformed when they pass through an ID restriction. Damage results in a loss of their elasticity which deforms the centralizer and, therefore, cannot expand to the required diameter of the new open hole.
13-5/8” Centek TUR centralizer was passed through a restriction of 14.823” in the 16” casing for 9,250ft and then reverted back to zero start and running forces in the 17 1/2” open hole.
Running the Centek centralizers as the first option helped to save 3 days of rig time, compared to conventional centralizers, which may have been unable to get to bottom, first time.
"This is a technology improvement/innovation that will continue to be deployed for this application on deepwater Agbami wells."
Christian Rogerson, Drilling Operations Engineer, Chevron