Inventors:
Johannis Josephus Den Boer - Rijswijk, NL
John Foreman Stewart - Houston TX, US
Assignee:
Shell Oil Company - Houston TX
International Classification:
E21B 43/00
US Classification:
166 66, 166 67, 166328, 166 7515
Abstract:
The invention relates to a device for holding and releasing an object, such device having a body with a cavity in which the object is accommodatable, an elastic retaining member for retaining the object in the cavity, and, a pushing member for pushing the object out of the body past the retaining member. The pushing member has a first stimuli responsive gel, which has a volume that varies in response to variation of a selected physical stimulating parameter and a controller capable of activating the pushing member by stimulating the first gel.