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Several recent failures of centralizers run through casing exits have resulted in significant lost time associated with fishing and milling lost pieces of centralizers, to place the wells into proper service. After three such failures, the requirement to study the passage of a centralized liner through a casing exit became essential. Torque and drag modeling provided the down and side force estimates exerted on the liner and centralizer as they passed through a casing exit. A test fixture was utilized to simulate liners being run through a casing exit. Several potential centralizer candidates were tested, using the loads estimated from modeling.
This article discusses the problems noted in the installation prior to testing, details the modeling used to determine loads being exerted on the centralizer at the window, shows results of the yard tests conducted on several commonly utilized industry centralizers, and makes recommendations.
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