Magnetic sensor assembly having a non-flat shape plug for cement slurry sensing

Abstract

Disclosed herein are embodiments of a sensor assembly apparatus, system, and method. In one embodiment, an apparatus comprises a sensor assembly adapted to be integrated into a casing to be positioned in a wellbore, the sensor assembly comprising a housing; a magnet located within the housing; a magnetic sensor located within the housing to measure a magnetic measurement change resulting from a force between the magnet and magnetic particles flowing with a cement slurry inside the casing from a reverse cementing; and a sensor plug having a side with a non-flat shape that is to be in contact with the slurry flowing in the casing of the wellbore; a processor communicatively coupled to the magnetic sensor and configured to determine whether the magnetic measurement change exceeds a magnetic threshold; and determine that the slurry is flowing back up internal to the casing at or beyond a location in the wellbore.