An improved version of the capillary bridge viscometer that compensates for the effect of solvent compressibility is disclosed. A novel, yet simple and inexpensive modification to a conventional capillary bridge viscometer design can improve its ability to reject pump pulses by more than order of magnitude. This improves the data quality and allows for the use of less expensive pumps. A pulse compensation volume is added such that it transmits pressure to the differential pressure transducer without sample flowing there through. The pressure compensation volume enables the cancellation of the confounding effects of pump pulses in a capillary bridge viscometer.

An improved version of the capillary bridge viscometer that compensates for the effect of solvent compressibility is disclosed. A novel, yet simple and inexpensive modification to a conventional capillary bridge viscometer design can improve its ability to reject pump pulses by more than order of magnitude. This improves the data quality and allows for the use of less expensive pumps. A pulse compensation volume is added such that it transmits pressure to the differential pressure transducer without sample flowing there through. The pressure compensation volume enables the cancellation of the confounding effects of pump pulses in a capillary bridge viscometer.

A measurement apparatus and method for determining a viscosity of a fluid are disclosed. A predetermined pre-fill portion of a sample of the fluid is injected into a capillary at a predetermined flow rate. The pressure differential across the capillary is determined, and the measurement is aborted when the measured pressure is greater than a predetermined maximum pressure. When the measured pressure is less than the predetermined maximum pressure, the remaining portion of the sample is injected into through the capillary. The viscosity of the sample is calculated based on a pressure within the capillary during the injection of the remaining portion of the sample.

A measurement apparatus and method for determining a viscosity of a fluid are disclosed. A predetermined pre-fill portion of a sample of the fluid is injected into a capillary at a predetermined flow rate. The pressure differential across the capillary is determined, and the measurement is aborted when the measured pressure is greater than a predetermined maximum pressure. When the measured pressure is less than the predetermined maximum pressure, the remaining portion of the sample is injected into through the capillary. The viscosity of the sample is calculated based on a pressure within the capillary during the injection of the remaining portion of the sample.

The present disclosure describes methods and systems for analyzing drilling fluid rheology at a drilling site. One method includes obtaining, from a wellbore drilling system implementing a wellbore drilling operation at a wellbore drilling site, a sample of a drilling fluid being used in the wellbore drilling operation at the wellbore drilling site; flowing the sample through an elongated tubular member at a plurality of different flow rates, the elongated tubular member installed at the wellbore drilling site; measuring, at the wellbore drilling site and at each flow rate, a stress-strain response of the sample in response to each flow rate; generating a plurality of stress-strain responses for the sample at the corresponding plurality of different flow rates, the plurality of stress-strain responses including each stress-strain response of the sample measured at each flow rate; and returning the sample to the wellbore drilling operation.

The present disclosure describes methods and systems for analyzing drilling fluid rheology at a drilling site. One method includes obtaining, from a wellbore drilling system implementing a wellbore drilling operation at a wellbore drilling site, a sample of a drilling fluid being used in the wellbore drilling operation at the wellbore drilling site; flowing the sample through an elongated tubular member at a plurality of different flow rates, the elongated tubular member installed at the wellbore drilling site; measuring, at the wellbore drilling site and at each flow rate, a stress-strain response of the sample in response to each flow rate; generating a plurality of stress-strain responses for the sample at the corresponding plurality of different flow rates, the plurality of stress-strain responses including each stress-strain response of the sample measured at each flow rate; and returning the sample to the wellbore drilling operation.

The present disclosure describes methods and systems for analyzing drilling fluid rheology at a drilling site. One method includes obtaining, from a wellbore drilling system implementing a wellbore drilling operation at a wellbore drilling site, a sample of a drilling fluid being used in the wellbore drilling operation at the wellbore drilling site; flowing the sample through an elongated tubular member at a plurality of different flow rates, the elongated tubular member installed at the wellbore drilling site; measuring, at the wellbore drilling site and at each flow rate, a stress-strain response of the sample in response to each flow rate; generating a plurality of stress-strain responses for the sample at the corresponding plurality of different flow rates, the plurality of stress-strain responses including each stress-strain response of the sample measured at each flow rate; and returning the sample to the wellbore drilling operation.

Gas sensor (2) for measuring properties of a gas (1), including a gas viscosity sensor (4) comprising a gas interface portion (20) in contact with the gas (1) to be measured, and a measuring chamber system (15) comprising a measuring chamber (16), a first resistive passage (18) fluidically connecting the measuring chamber (16) to the gas interface portion (20), a pressure generator (25) configured to generate a change in pressure in the measuring chamber, and a pressure sensor (28) configured to measure a time dependent variation in pressure of gas in the measuring chamber, the time dependent variation of pressure in the measuring chamber due to flow of gas through the resistive passage being correlated to a viscosity of the gas. The gas viscosity sensor further comprises a reference chamber system (21) comprising a reference chamber and a second resistive passage (24) fluidically interconnecting the reference chamber (22) to the gas interface portion (20), the reference chamber (22) being coupled to the pressure sensor (28) of the measuring chamber such that the pressure sensor is configured to measure a differential pressure between a pressure in the measuring chamber and a pressure in the reference chamber.

Gas sensor (2) for measuring properties of a gas (1), including a gas viscosity sensor (4) comprising a gas interface portion (20) in contact with the gas (1) to be measured, and a measuring chamber system (15) comprising a measuring chamber (16), a first resistive passage (18) fluidically connecting the measuring chamber (16) to the gas interface portion (20), a pressure generator (25) configured to generate a change in pressure in the measuring chamber, and a pressure sensor (28) configured to measure a time dependent variation in pressure of gas in the measuring chamber, the time dependent variation of pressure in the measuring chamber due to flow of gas through the resistive passage being correlated to a viscosity of the gas. The gas viscosity sensor further comprises a reference chamber system (21) comprising a reference chamber and a second resistive passage (24) fluidically interconnecting the reference chamber (22) to the gas interface portion (20), the reference chamber (22) being coupled to the pressure sensor (28) of the measuring chamber such that the pressure sensor is configured to measure a differential pressure between a pressure in the measuring chamber and a pressure in the reference chamber.

A device (20) for measuring the flow rate and the viscosity of ink sent to a print head (50) of an ink jet printer, comprising: a conduit (200), for supplying the print head (50), this conduit being provided with a 1.sup.st pressure (Pin) sensor (26) at a first end and a 2.sup.nd pressure (PHead) sensor (56) at a 2.sup.nd end, circuit or controller (26, 56) for measuring at least the pressure (PHead) of the 2.sup.nd pressure sensor (56) and the pressure difference (Pin−PHead) between the 1.sup.st pressure sensor (26) and the 2.sup.nd pressure sensor (56).