Weatherford U.k. Limited

Weatherford Technology Holdings, LLC

Philip Cg Egleton

Stephen Reid

Andrew John Elrick

Santiago Galvez Porta

Alan Craigon

A downhole slip apparatus that includes a radially extendable slip assembly. The radially extendable slip assembly including a primary slip arrangement and a secondary slip arrangement. The downhole slip apparatus is arranged such that during a first phase of operation the primary and secondary slip arrangements are radially extendable simultaneously from a retracted configuration towards and/or into a first extended configuration. The downhole slip apparatus is also arranged such that during a subsequent second phase of operation the secondary slip arrangement is radially extendable relative to the primary slip arrangement towards and/or into a second extended configuration.

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Newmachar, United Kingdom

Philip Cg Egleton