Schlumberger Technology Corporation

Geoservices Equipements, Roissy En France

Services Petroliers Schlumberger

François Chevillard

Jean-Louis Pessin

Vincent Chatelet

Fabio Cecconi

Francois Joseph Girardi

The disclosure relates to a method for monitoring the performances of a cable for carrying a downhole assembly in a wellbore, the cable comprising at least a conductive core and an insulating outer layer, comprising:

System and method for monitoring the performances of a cable carrying a downhole assembly

The disclosure relates to a method for monitoring the performances of a cable for carrying a downhole assembly in a wellbore, the cable having at least a conductive core and an insulating outer layer, the method including:

Safety device () for a fluid production well, comprising a valve () used to seal a passage, and which can move between an open position of the passage () and a closed position of the passage (); and connecting biasing means () for permanently biasing the valve () towards the closed position thereof. The device comprises holding means () for holding the valve () in its open position against permanent biasing means (), and actuating means () which are configured to actuate the holding means (), on reception of a maintenance signal, to generate: *a first displacement of the movement element () from the active valve biasing position to an intermediate valve biasing position, in which the valve () remains in its open position; and *a subsequent second return displacement of the movement element () from the intermediate valve biasing position to the active valve biasing position.

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Roissy-en-France, France

François Chevillard