Abstract: A centralizer operable to connect with and centralize a downhole tool within a tubular string within a wellbore and to facilitate reception of electromagnetic signals transmitted through the Earth. The centralizer has a body, a first contacting member electrically connected to the body and extending radially away from the body such that the first contacting member contacts an inner surface of the tubular string to electrically connect the tubular string to the body, and a second contacting member electrically insulated from the body and extending radially away from the body such that the second contacting member contacts the inner surface of the tubular string to centralize at least a portion of the body within the tubular string.

Abstract: A centralizer operable to connect with and centralize a downhole tool within a tubular string within a wellbore and to facilitate reception of electromagnetic signals transmitted through the Earth. The centralizer has a body, a first contacting member electrically connected to the body and extending radially away from the body such that the first contacting member contacts an inner surface of the tubular string to electrically connect the tubular string to the body, and a second contacting member electrically insulated from the body and extending radially away from the body such that the second contacting member contacts the inner surface of the tubular string to centralize at least a portion of the body within the tubular string.

Abstract: The disclosure relates to a cable (100) comprising a core (102) and a plurality of reinforcing elements (107) arranged around the core (102) so as to cover the core (102), wherein each reinforcing element (107) includes at least a bundle of reinforcement fibers compriseing at least one fiber and a thermoset matrix impregnating the bundle of fibers, wherein each reinforcing element (107) is individually tubed with a thermoplastic coating (112).

Abstract: 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: measuring a downlink telemetry signal, transmitted from a surface control module to the downhole assembly, and/or an uplink telemetry signal, transmitted from the downhole assembly to the surface control module; representing the downlink and/or uplink telemetry signals as a function of a parameter representative of a depth of the downhole assembly, analyzing a variation of the telemetry signal as a function of the parameter in view of an electrical model of an installation including the cable and the downhole assembly disposed in the wellbore, determining location of anomalies of the cable based on the analysis.

Abstract: 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: performing on the cable a detection operation for detecting the presence of local anomalies of the cable; generating an electrical model of a predetermined configuration of an installation including the cable and the downhole assembly disposed in the wellbore, the model being defined in function of the detected local anomalies, estimating a parameter relative to a signal transmitted by the cable between the downhole assembly and a surface equipment in the predetermined configuration on the basis of the electrical model.

Abstract: Safety device (10) for a fluid production well, comprising a valve (58) used to seal a passage, and which can move between an open position of the passage (52) and a closed position of the passage (52); and connecting biasing means (92) for permanently biasing the valve (58) towards the closed position thereof. The device comprises holding means (42) for holding the valve (58) in its open position against permanent biasing means (92), and actuating means (42, 44) which are configured to actuate the holding means (42), on reception of a maintenance signal, to generate: *a first displacement of the movement element (98) from the active valve biasing position to an intermediate valve biasing position, in which the valve (58) remains in its open position; and *a subsequent second return displacement of the movement element (58) from the intermediate valve biasing position to the active valve biasing position.

Abstract: 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: measuring a downlink telemetry signal, transmitted from a surface control module to the downhole assembly, and/or an uplink telemetry signal, transmitted from the downhole assembly to the surface control module; representing the downlink and/or uplink telemetry signals as a function of a parameter representative of a depth of the downhole assembly, analyzing a variation of the telemetry signal as a function of the parameter in view of an electrical model of an installation including the cable and the downhole assembly disposed in the wellbore, determining location of anomalies of the cable based on the analysis.

Abstract: Safety device (10) for a fluid production well, comprising a valve (58) used to seal a passage, and which can move between an open position of the passage (52) and a closed position of the passage (52); and connecting biasing means (92) for permanently biasing the valve (58) towards the closed position thereof. The device comprises holding means (42) for holding the valve (58) in its open position against permanent biasing means (92), and actuating means (42, 44) which are configured to actuate the holding means (42), on reception of a maintenance signal, to generate: a first displacement of the movement element (98) from the active valve biasing position to an intermediate valve biasing position, in which the valve (58) remains in its open position; and a subsequent second return displacement of the movement element (58) from the intermediate valve biasing position to the active valve biasing position.

Abstract: 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: performing on the cable a detection operation for detecting the presence of local anomalies of the cable; generating an electrical model of a predetermined configuration of an installation including the cable and the downhole assembly disposed in the wellbore, the model being defined in function of the detected local anomalies, estimating a parameter relative to a signal transmitted by the cable between the downhole assembly and a surface equipment in the predetermined configuration on the basis of the electrical model.