A method for measuring viscosity in a borehole includes: pumping downhole fluid through at least one tube disposed in a carrier configured to be disposed in a borehole in an earth formation; taking at least one differential pressure measurement of the fluid in the at least one tube via a pressure transducer; and estimating a viscosity of the fluid based on the differential pressure measurement.

A method for measuring viscosity in a borehole includes: pumping downhole fluid through at least one tube disposed in a carrier configured to be disposed in a borehole in an earth formation; taking at least one differential pressure measurement of the fluid in the at least one tube via a pressure transducer; and estimating a viscosity of the fluid based on the differential pressure measurement.

A viscometer includes a viscosity sensor with a liquid flow channel and at least two pressure sensors positioned along the liquid flow channel and configured to measure a pressure drop of a liquid flowing through the liquid flow channel, and a dispensing mechanism configured to cause dispensing of a liquid from the syringe to the viscosity sensor at a known flow rate. The dispensing mechanism and the viscosity sensor are configured to couple with a syringe configured to contain a liquid. The viscometer further includes an electronic controller configured to control operations of the dispensing mechanism and receive and process data from the viscosity sensor. The viscometer includes a sample loading interface, included in the syringe, through which the viscometer is configured to receive the liquid. The sample loading interface includes a selection valve coupled with, and located between, the viscosity sensor and the syringe.

The invention relates in particular to a device for determining one or more fluid properties of a fluid. The device preferably comprises a flow distributor comprising a cavity, an inlet to the cavity, one or more outlets from the cavity, and one or more flow deflecting elements present in the cavity and/or one or more flow dividing wall elements of the cavity, wherein the one or more flow deflecting elements and/or the flow dividing wall elements being arranged in such a manner that it provides sub-streams of different strength through the outlet. Furthermore, the device comprises an analyzer downstream of the outlet of the flow distributor comprising means adapted to provide a read-out indicative of the strengths of sub-streams.

The invention relates in particular to a device for determining one or more fluid properties of a fluid. The device preferably comprises a flow distributor comprising a cavity, an inlet to the cavity, one or more outlets from the cavity, and one or more flow deflecting elements present in the cavity and/or one or more flow dividing wall elements of the cavity, wherein the one or more flow deflecting elements and/or the flow dividing wall elements being arranged in such a manner that it provides sub-streams of different strength through the outlet. Furthermore, the device comprises an analyzer downstream of the outlet of the flow distributor comprising means adapted to provide a read-out indicative of the strengths of sub-streams.

A system and method of determining a rheological property of a fluid. A turbine has at least two disks separated by a variable gap and rotating around a rotational axis of the turbine. Fluid flows into the gap at a circumferential edge of the disks to rotate the disks. A first value of a dynamic parameter of the turbine resulting from an interaction between the disks and the fluid in the gap is measured as the fluid flows from the circumferential edge towards the axis with the gap having a first gap width. A second value of the dynamic parameter is measured with the gap having a second gap width different from the first gap width. The rheological property of the fluid is determined based on the first value of the dynamic parameter and the second value of the dynamic parameter.

A system and method of determining a rheological property of a fluid. A turbine has at least two disks separated by a variable gap and rotating around a rotational axis of the turbine. Fluid flows into the gap at a circumferential edge of the disks to rotate the disks. A first value of a dynamic parameter of the turbine resulting from an interaction between the disks and the fluid in the gap is measured as the fluid flows from the circumferential edge towards the axis with the gap having a first gap width. A second value of the dynamic parameter is measured with the gap having a second gap width different from the first gap width. The rheological property of the fluid is determined based on the first value of the dynamic parameter and the second value of the dynamic parameter.

This application describes a viscosity measuring instrument that measures viscosity as a function of shear rate in a high throughput manner. The instrument may include multiple viscosity measurement sensor chips arranged in parallel so that viscosity is measured at multiple shear rates simultaneously for many samples. For example, the instrument may include multiple viscosity sensors with liquid flow channels for measuring viscosities of liquids flowing through the flow channels and multiple syringes, each outlet of which is connected to a corresponding inlet of multiple viscosity sensors. The instrument may also include a pump module with a pusher block having a mechanism to lock and unlock ends of pistons of the multiple syringes.

This application describes a viscosity measuring instrument that measures viscosity as a function of shear rate in a high throughput manner. The instrument may include multiple viscosity measurement sensor chips arranged in parallel so that viscosity is measured at multiple shear rates simultaneously for many samples. For example, the instrument may include multiple viscosity sensors with liquid flow channels for measuring viscosities of liquids flowing through the flow channels and multiple syringes, each outlet of which is connected to a corresponding inlet of multiple viscosity sensors. The instrument may also include a pump module with a pusher block having a mechanism to lock and unlock ends of pistons of the multiple syringes.

Systems and techniques are described for a fluid diode. In some examples, a fluid diode can include a first fluid path for a first flow of fluid to traverse the fluid diode via a first flow direction and a second fluid path for a second flow of fluid to traverse the fluid diode via a second flow direction. The first flow direction can be associated with a first pressure drop and the second flow direction can be associated with a second pressure drop that is different than the first pressure drop. Moreover, the first fluid path and the second fluid path can be configured to remain open to the first flow and the second flow in the first flow direction and the second flow direction.