A MEMS densimeter may include a cantilever portion defining one or more microcapillaries. The microcapillaries may provide an enhanced response to the fluid density. The microcapillaries may include microcapillaries which are aligned with flexure of the cantilever portion, such s through-hole microcapillaries, blind-hole microcapillaries, and grid microcapillaries. The microcapillaries may also include a plate microcapillary aligned normal to the flexure of the cantilever portion.

A MEMS densimeter may include a cantilever portion defining one or more microcapillaries. The microcapillaries may provide an enhanced response to the fluid density. The microcapillaries may include microcapillaries which are aligned with flexure of the cantilever portion, such s through-hole microcapillaries, blind-hole microcapillaries, and grid microcapillaries. The microcapillaries may also include a plate microcapillary aligned normal to the flexure of the cantilever portion.

A system and method of determining a density of a drilling fluid in a wellbore. The system includes a drill string in the wellbore, the drill string including a downhole rotor. A drilling fluid flowing through the drill string in the wellbore causes the downhole rotor to rotate relative to the drill string. A brake is configured to apply a first brake torque to the downhole rotor to place the downhole rotor in a first state. A torque measurement system is configured to determine the applied first brake torque. A rotor speed measurement system is configured to measure a first downhole rotor speed of the downhole rotor having the drilling fluid flowing therethrough with the downhole rotor in the first state. A processor is configured to determine a density of the drilling fluid from the measured first downhole rotor speed, and the determined applied first brake torque.

A system and method of determining a density of a drilling fluid in a wellbore. The system includes a drill string in the wellbore, the drill string including a downhole rotor. A drilling fluid flowing through the drill string in the wellbore causes the downhole rotor to rotate relative to the drill string. A brake is configured to apply a first brake torque to the downhole rotor to place the downhole rotor in a first state. A torque measurement system is configured to determine the applied first brake torque. A rotor speed measurement system is configured to measure a first downhole rotor speed of the downhole rotor having the drilling fluid flowing therethrough with the downhole rotor in the first state. A processor is configured to determine a density of the drilling fluid from the measured first downhole rotor speed, and the determined applied first brake torque.

The present disclosure provides a cascading density separator for facilitating density-based classification of particulate material. Further, the cascading density separator may include a basin defining an interior channel and comprising a first lateral wall and a second lateral wall, the second lateral wall including an outwardly angled deflection portion at a 45 angle relative of a spiral classifier disposed in the interior channel, the basin. Further, the cascading density separator may include a spiral classifier positioned within the basin and interposed between the first lateral wall and the second lateral wall, the spiral classifier. Further, the cascading density separator may include a spray nozzle mounted, the spray nozzle configured for spraying water into the interior channel and washing a lighter material from the particulate material downward for discharge while enabling the denser material to be retained and lifted by the spiral classifier.

The present disclosure provides a cascading density separator for facilitating density-based classification of particulate material. Further, the cascading density separator may include a basin defining an interior channel and comprising a first lateral wall and a second lateral wall, the second lateral wall including an outwardly angled deflection portion at a 45 angle relative of a spiral classifier disposed in the interior channel, the basin. Further, the cascading density separator may include a spiral classifier positioned within the basin and interposed between the first lateral wall and the second lateral wall, the spiral classifier. Further, the cascading density separator may include a spray nozzle mounted, the spray nozzle configured for spraying water into the interior channel and washing a lighter material from the particulate material downward for discharge while enabling the denser material to be retained and lifted by the spiral classifier.