Apparatus and method for measuring the acoustic impedance of wellbore fluids

摘要

An ultrasonic scanner tool employs a transducer that excites a target plate at a known distance from the transducer. One side of the target plate forms a chamber that in operation is filled with wellbore fluid. On the other side of the target plate, a chamber is formed containing a vacuum or a fluid with a significantly lower acoustic impedance than the wellbore fluid and the target plate, allowing an improved measurement of the acoustic impedance of the wellbore fluid.

主权项

1. A measurement section for a downhole tool, comprising:
a target plate; a transducer, disposed on a first side of the target plate, aimed at the target plate; and an enclosure, formed on a second side of the target plate, opposite the first side, wherein the first side of the plate is open to wellbore fluid when in operation, and wherein the enclosure encloses a volume of a lower acoustic impedance than the wellbore fluid.