Abstract: A system for inserting injection fluid into a stream of hydrocarbon fluid flowing through a wellbore formed in an earth formation is provided. The system comprises a production conduit for conveying the stream of hydrocarbon fluid through the wellbore to the earth surface, the conduit being provided with at least one valve chamber that is suitable to receive a retrievable valve body therein, the valve body including a valve that is controllable via an electric circuit connected to surface control equipment so as to move the valve between an open position thereof whereby the valve provides fluid communication between the stream and a fluid injection channel extending in the wellbore, and a closed position thereof whereby the valve prevents fluid communication between the stream and the fluid injection channel, wherein the electric circuit comprises an inductive coupler including a primary coil provided within the production conduit and a secondary coil provided within the valve body.

Abstract: System for measuring particle transport in a fluid, comprising a transmitter for transmitting a wave beam in the direction of a measuring volume in the fluid under the control of an electrical control signal and a receiver receiving, within a reception beam, waves scattered by particles in said measuring volume and supplying a corresponding electrical reception signal. The measuring volume is determined by the intersection of the transmission beam and the reception beam, The system comprises a second receiver which receives scattered waves from a second correspondingly defined measuring volume. The wave propagation path between the transmitter and the second receiver is equal to n times the wave propagation path between the transmitter and the first receiver.