Tracer injection system for use in a well, oil well for oil product production and method of operating an oil well

摘要

"Tracer Injection System for Use in a Well, Oil Well for Producing Oil Products and Method of Operating an Oil Well". An oil well (20) comprises a well casing (30), a production pipe (40), a time varying current source (68), a tracer injection device within the borehole (60). ), and an induction buffer circuit inside the borehole (90). The casing (30) extending into a well borehole (20). The tubing (40) extends into the casing (30). The current source 68 is located on the surface. The current source (68) is electrically connected to, and adapted to produce a time varying current to the pipe (40) / or sheath (30), which acts as electrical conductors to provide power and / or communications within the borehole to the injection device (60). The injection device (60) comprises a communications and control module (80), a tracer material reservoir (82), and an electrically controllable tracer injector (84). The communications and control module (80) is electrically connected to the piping (40) and / or casing (30). The induction buffer circuit inside the borehole (90) is located around a portion of the tubing (40) and / or casing (30). The induction buffer circuit (90) is adapted to route part of the electrical current through the communications and control module (80) by creating a voltage potential between one side of the induction buffer circuit (90) and another side of the circuit. induction buffer (9). Communications and control module (80) is electrically connected via voltage potential. The well (20) may additionally comprise a sensor (108) or a sensor device (140) located upstream of the injection device (60) and being adapted to detect tracing material injected into the well by the injection device. Sensor device (140) may also be located within the borehole, and may comprise a modem (146) for sending data to the surface via tubing (40) and / or casing (30).