Abstract: Viscosity assemblies may be used to determine the viscosity of a sample fluid at a surface location under one or more downhole conditions prior to pumping or flowing of the sample fluid downhole. A viscosity assembly may include a bob assembly disposed in a container that includes a bob disposed about a magnet rotor that rotates when a shear force is applied by the flow of the sample fluid in the container. A stator coil may receive a control signal that induces a force or a voltage that causes the magnet rotor to rotate the bob by a predetermined distance to position the bob from the rotated position back to the initial position.

Abstract: Viscosity assemblies may be used to determine the viscosity of a sample fluid at a surface location under one or more downhole conditions prior to pumping or flowing of the sample fluid downhole. A viscosity assembly may include a bob assembly disposed in a container that includes a bob disposed about a magnet rotor that rotates when a shear force is applied by the flow of the sample fluid in the container. A stator coil may receive a control signal that induces a force or a voltage that causes the magnet rotor to rotate the bob by a predetermined distance to position the bob from the rotated position back to the initial position.

Abstract: Systems and methods for measuring the viscosity of a fluid may comprise a rotor cup having an inner chamber; a first bob rotatably disposed within a first region of the inner chamber; and a second bob rotatably disposed within a second region of the inner chamber, wherein the second bob rotates relative to the first bob based on a difference in viscosity of fluid in the first region and the second region.

Abstract: A system for measuring the viscosity of a fluid comprises a rotor cup; a bob disposed within the rotor cup and having shaft rotatably coupled to the rotor cup; a bearing connecting the shaft of the bob to the rotor cup; a magnetic coupling comprising a first magnetic element connected to the shaft of the bob and a second magnetic element disposed outside the rotor cup adjacent to the first magnetic element; and an inertial measurement unit disposed adjacent to the second magnetic element which is capable of sensing rotation of the magnetic coupling.

Abstract: Systems and methods for measuring the viscosity of a fluid comprises an oscillation cylinder having an inner surface, wherein the oscillation cylinder includes a fluid; a fixed piston having a first stopper disposed within the oscillation cylinder and forming a seal with the inner surface; an adjustable piston having a second stopper disposed within the oscillation cylinder and forming a seal with the inner surface; a chamber defined between the first stopper and second stopper; a bob formed within the chamber having a sensor which measures an axial shear force induced by the oscillating cylinder which is indicative of the apparent viscosity of the fluid in the chamber; and a motor capable of linearly translating the oscillation cylinder.

Abstract: Systems and methods for measuring the viscosity of a fluid comprises an oscillation cylinder having an inner surface, wherein the oscillation cylinder includes a fluid; a fixed piston having a first stopper disposed within the oscillation cylinder and forming a seal with the inner surface; an adjustable piston having a second stopper disposed within the oscillation cylinder and forming a seal with the inner surface; a chamber defined between the first stopper and second stopper; a bob formed within the chamber having a sensor which measures an axial shear force induced by the oscillating cylinder which is indicative of the apparent viscosity of the fluid in the chamber; and a motor capable of linearly translating the oscillation cylinder.

Abstract: A system for measuring the viscosity of a fluid comprises a rotor cup; a bob disposed within the rotor cup and having shaft rotatably coupled to the rotor cup; a bearing connecting the shaft of the bob to the rotor cup; a magnetic coupling comprising a first magnetic element connected to the shaft of the bob and a second magnetic element disposed outside the rotor cup adjacent to the first magnetic element; and an inertial measurement unit disposed adjacent to the second magnetic element which is capable of sensing rotation of the magnetic coupling.

Abstract: Systems and methods for measuring the viscosity of a fluid may comprise a rotor cup having an inner chamber; a first bob rotatably disposed within a first region of the inner chamber; and a second bob rotatably disposed within a second region of the inner chamber, wherein the second bob rotates relative to the first bob based on a difference in viscosity of fluid in the first region and the second region.