Abstract: A method is provided for allowing a monitoring system to classify, by entity, IP “accounting” elements passing through routers of a network of a service provider, these entities being arranged in different sites connected to the network. The method includes: each site is associated with an interface of a router to which that site is connected, and during analysis by the monitoring system of an accounting element originating from a router, information relating to the source interface and destination interface contained in this accounting element is used in order to identify the source and destination sites and to classify this accounting element with respect to the correct source or destination entity.

Abstract: A method is provided for allowing a monitoring system to classify, by entity, IP “accounting” elements passing through routers of a network of a service provider, these entities being arranged in different sites connected to the network. The method includes: each site is associated with an interface of a router to which that site is connected, and during analysis by the monitoring system of an accounting element originating from a router, information relating to the source interface and destination interface contained in this accounting element is used in order to identify the source and destination sites and to classify this accounting element with respect to the correct source or destination entity.

Abstract: In order to detect the presence of a native reservoir fluid within a well bore, an auxiliary drilling fluid is injected into the borehole and recovered after it has circulated within the borehole. The detection system comprises a pressure-wave generator, an upstream pressure sensor for detecting the pressure wave as it passes through a first pipe in which the auxiliary drilling fluid circulates in the uncontaminated state, an outlet pressure sensor for detecting the pressure wave as it passes through a second pipe in which the auxiliary drilling fluid circulates and may be contaminated by a reservoir fluid which has entered the drilling fluid at any point of the well bore.

Abstract: The amplitude variation of an acoustic wave propagated within drilling mud mixed with a mineral-deposit fluid is measured and compared with the amplitude of a reference wave obtained from the drilling mud alone. The method and the device are primarily applied to the detection of an inflow of oil or gas during a well-drilling operation.