FREMGANGSMAATE OG ANORDNING FOR AA AVTETTE ET OMRAADE AV GRUNNEN ELLER SJOEBUNNEN SOM INNEHOLDER OLJE ELLER GASS SAERLIG I FORBINDELSE MED OVERHALING AV EN BOREBROENN

摘要

The invention relates to a device and method for isolating an underground formation containing a fluid such as crude oil and/or gas. The device includes a packer 12, and a valve 11 sealingly fixed to the packer and having an obturator 24 for opening and closing the valve. The device also includes hydraulic actuating means 10 for the valve, which actuating means is releasably connectable to the valve and actuated from the surface by the intermediary of the fluid filling the well. The device finds its main application in the workover of wells having an electric pump for pumping the fluid to the surface. IMAGE