Patent ID: 7784338
Filing Date: 2010-08-31
Classification: E21B

Abstract:
1. A low mass sensor assembly for a well casing measurement tool, comprising: a magnetic amplifier assembly having a first part and a second part; a sensor body having a tubular shape, wherein the first part of the magnetic amplifier assembly is disposed proximate and within an outer surface of a first portion of the sensor body, said first part comprising first and second cylindrical magnets oriented parallel to each other and a sensor coil configured as a cylindrical inductor and disposed between and parallel with said first and second magnets and a pole piece disposed in contact with respective first ends of said magnets; and a sensor sleeve having a tubular shape and configured for concentrically and freely receiving the sensor body therewithin, wherein the second part of the magnetic amplifier assembly comprises a magnetic sensor plate portion of the sensor sleeve in juxtaposition with the first portion of the sensor body.