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.

Viscometers and Viscometry methods are disclosed. In one general aspect a capillary bridge viscometer comprises an input port an output port a first capillary tubing arm in a first hydraulic path between the input port and a first differential detection point, a second capillary tubing arm in a second hydraulic path between the first differential detection point and the output port, a third capillary tubing arm in a third hydraulic path between the input port and a second differential detection point, a fourth capillary tubing arm in a fourth hydraulic path between the second differential detection point and the output port, an adjustable mechanical flow restrictor in one of the first, second, third, and fourth hydraulic paths, wherein the adjustable mechanical flow restrictor is operative to mechanically adjust a resistance to flow of a fluid while the fluid flows through the adjustable mechanical flow restrictor.

A rotary viscometer includes: a measurement rotor that comes into contact with a fluid whose viscosity is to be detected; a rotating shaft that is connected to the measurement rotor; a drive part that rotates the measurement rotor via the rotating shaft; a measurement part that measures the viscosity of the fluid on the basis of torque generated in accordance with rotation of the measurement rotor; a housing that accommodates at least the measurement rotor, the rotating shaft, and the drive part; and a window part that is provided in the housing such that the rotating shaft is observable from the outside.

A bracket a thrombelastography device, and a support system are disclosed. The bracket comprises: a fixed support part (101), a movable support part (102), and a connection part (103). The connection part comprises a first fixing connection member (1031) and a second fixing connection member (1032). The first fixing connection member is fixedly connected to the fixed support part; the second fixing connection member is fixedly connected to the movable support part; the first fixing connection member is connected to the second fixing connection member in point contact fashion, such that the first fixing connection member and the second fixing connection member can rotate relative to each other; the movable support part is fixedly connected to a supported object; when driven by the supported object, the movable support part rotates relative to the fixed support part by means of the point contact between the first fixing connection member and the second fixing connection member. The thrombelastography device comprises a rotational shaft and a bracket. The rotational resistance to the supported object when it rotates can be reduced.

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.

An apparatus to determine fluid viscosities downhole in real-time includes a housing and an excitation element positioned therein. Electrical circuitry provides a drive signal that excites an excitation element into rotational oscillations. A detector produces a response signal correlating to the detected oscillating movement of the excitation element. Circuitry onboard the apparatus utilizes the drive and response signals to determine the fluid viscosity.

An embodiment includes an inertial torque device (ITD) for calibrating a viscometer. The ITD comprises a body, a coupling for connecting the body to a viscometer measurement interface, a rotatable inertial load device coupled to the body, an electric motor coupled to the rotatable inertial load device and coupled to the body, and a controller configured to calibrate the viscometer by controlling the electric motor to rotate the rotatable inertial load device at a predetermined acceleration to apply a predetermined torque to the coupling connected to the viscometer.

An apparatus for measuring blood coagulation data, and a use method and calibration method thereof are disclosed. The apparatus comprises: a movable support part (101), a fixed support part (102), a connection part (103), a rotary shaft (104), a magnet (105), a Hall element (106), and a processing unit (107). One end of the movable support part (101) is fixedly connected to the rotary shaft (104), and the other end of the movable support part (101) is connected to the fixed support part (102) by means of the connection part (103); the movable support part (101) is fixedly connected to the magnet (105); the rotary shaft (104) is able to rotate relative to the fixed support part (102) under the driving force of measured blood and drive the movable support part (101) to rotate; the movable support part (101) is able to move the magnet (105) to cause a change in the magnetic field of the magnet (105); the Hall element (106) is connected to the processing unit (107); the Hall element (106) is used for outputting a measurement electric signal according to the magnetic field change of the magnet (105); and the processing unit (107) is used for determining blood coagulation data of the measured blood according to the measurement electric signal. The present apparatus can improve the accuracy in measurement of blood coagulation data.

An apparatus for measuring the viscosity of fluid, including a container having a first end and a second end. The container is configured for holding fluid between the first and second ends. The apparatus further includes a moving body made of magnetic material configured to travel along a trajectory inside the container between the first and second ends, and at least one magnetic sensor configured for measuring changes in a magnetic field produced by the moving body during the travel. The apparatus further includes a memory device having prestored information related to dependencies between magnetic field variations along the trajectory and a viscosity of the fluid. The apparatus further includes a processor configured to determine viscosity of the fluid corresponding to the measured changes in accordance with the prestored information.

A bracket, a support system, and a thrombelastography device and use method thereof are disclosed. The bracket comprises: a first support part (1001), a second support part (1003), and a connection part (1002), wherein the first support part (1001) supports the second support part (1003) by means of the connection part (1002), so that the second support part (1003) can rotate relative to the first support part (1001) under a first action force. The first support part (1001) comprises: a rotatable structure (1004), a support base (1013), and a stop mechanism (1024), wherein the stop mechanism (1024) is used for applying a stop force to the rotation of the rotatable structure (1004), the rotatable structure (1004) is supported on the support base (1013) and can rotate relative to the support base (1013) under a second action force when the stop force of the stop mechanism (1024) is eliminated, and the rotatable structure (1004) supports the second support part (1003) by means of the connection part (1002), so that the rotatable structure (1004) can rotate relative to the second support part (1003) while rotating relative to the support base (1013). Angular shifts of test parts of the thrombelastography device can be adjusted, thereby improving the measurement accuracy.