Centralizer Crimping

Securing centralizers, stop collars and wear bands to the string is required in applications where the string will be rotated downhole. These applications include Casing while Drilling (CwD) and reaming jobs as well as casing running scenarios where there is a need to rotate the string to break downhole friction.

The Volant RTF™ tool features hydraulically driven collets that plastically form the accessories onto casing by applying radial force to plastically reduce the accessory and elastically reduce the casing at the same time. When the tool is released, the higher yield strength casing springs back more than the lower yield strength accessory, creating an interference fit.

The crimped connection relies on the friction coefficient between the accessory and the casing as well as the grip force provided by the interference fit for its torque and load capacity. When properly completed, only a few inches of crimped length provide the torque and sliding resistance required for the various downhole applications.