Patent ID: 8952319
Filing Date: 2015-02-10
Classification: E21B

Abstract:
1. An apparatus, comprising: a support cable configured to allow the apparatus to be lowered into and raised from a wellbore; a housing attached to the support cable, where the housing includes a detector window on the exterior of the housing; a tracer delivery system that delivers a tracer composition having a first tracer concentration at a given pump rate into the wellbore; and a detector system within the housing that includes a detector that measures a second tracer concentration, wherein the second tracer concentration is a concentration after the tracer composition has substantially completely mixed with a well fluid in the wellbore, wherein the detector is operably connected to the detector window to direct energy from the detector window to the detector, and wherein the detector system includes a processing unit that determines a flow rate of the well fluid in the wellbore based on the first tracer concentration, the second tracer concentration, and the given pump rate.