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- W2078200103 abstract "Abstract The helical screw rheometer (HSR) is a new rotational viscometer with many unique features which provide distinct improvements in operation over those found in conventional couette, cone and plate, parallel plate, or other rotational type viscometers. Unlike these other rotational viscometers, the HSR response to rotation rate is measured in terms of pressure drop rather than torque. Access to a bank of multi-range pressure transducers external to the HSR provides a means for obtaining wide rangeability with this device. To achieve similar rangeability with a conventional rotational viscometer, it would be necessary to change the torque transducer, which is often an integral part of the instrument. With an open discharge, the HSR acts as a single screw extruder capable of circulating test fluid and/or drawing a new fluid sample for testing. Viscometric measurements are made by first closing the HSR discharge and then measuring pressure drop response as a function of rotation rate. Fluids containing particulates create measurement problems for conventional rotational viscometers. Particle settling leads to erroneous torque readings with these instruments. In contrast, HSR operation promotes mixing and prevents sedimentation. Although the HSR is an instrument applicable to a number of industry fluids, the scope of this paper is limited to the characterization of time independent, isothermal, power-law model stimulation fluids. A 2-in. diameter, square-pitch HSR with 0.1-in. thread depth was used to evaluate rheological properties of several different hydroxypropyl guar (HPG) solutions. Analysis procedures used to convert pressure drop versus rotation rate data to power-law n' and K'v values are described." @default.
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- W2078200103 date "1988-10-02" @default.
- W2078200103 modified "2023-09-24" @default.
- W2078200103 title "Helical Screw Rheometer: A New Tool for Stimulation Fluid Evaluation" @default.
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- W2078200103 doi "https://doi.org/10.2118/18213-ms" @default.
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