Expandable liner hanger with anchoring feature

摘要

An expandable liner hanger features carbide or other hard particles adhered to the outer surface of a tubular mandrel that is expanded using vulcanized rubber to retain the carbide during run in or set. The rubber can be directly applied to the outer surface of the mandrel or to a split ring that is subsequently secured to the outer surface of the mandrel. The rubber can also be mounted in an exterior recess to protect the carbide during running in from being knocked off with impact. A binder can be applied to the carbide or to the rubber for better fixation of the carbide when vulcanizing the rubber. The rubber moves with the expanding mandrel while binding the carbide until contact of the carbide to the surrounding tubular transfers the liner string weight to the surrounding tubular through the carbide.

主权项

1. An expandable liner hanger, comprising:
a tubular mandrel having an outer surface; a plurality of hard particles fixated at least in part within a layer of a flexible material on said outer surface; said layer of flexible material disposed in a recess of the outer surface having an inner surface against said mandrel and an outer surface opposite said inner surface, said hard particles extending through said outer surface of the flexible material and embedded in said layer short of said inner surface.