Patent ID: 11965417
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E  G | IPC E  G

Claim 0:
1. An apparatus comprising:
a sensor assembly adapted to be integrated into a casing to be positioned in a wellbore formed in a subsurface formation, wherein the sensor assembly comprises,
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 cement 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 cement slurry is flowing back up the wellbore internal to the casing at or beyond a location in the wellbore, in response to a determination that the magnetic measurement change exceeds the magnetic threshold.