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US 11,840,926 B2Granted
Non-invasive time-based sag testing apparatus
AssigneeBaker Hughes Oilfield Operations LLC
InventorEliah M. Everhard
Life of this patent
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Abstract
Time-based sag in a fluid can be measured non-invasively using a time-based sag testing apparatus by measuring the change in rotational inertia over time of fluid having no initial density gradient and a center of mass initially coincident with its geometric center.
Claims5
A non-invasive method for measuring time-based sag in a fluid having a mass, the method comprising:
- providing a test cell that contains the fluid, where the test cell comprises an original center of mass and a lateral axis extending through the original center of mass;
- after a time period sufficient for fluid sag to occur, rotating the test cell about the lateral axis from an initial vertical position to a non-vertical position;
- measuring the static torque required to hold the test cell at the non-vertical position;
- and
- using the measured torque to determine the distance from the original center of mass to a resultant center of mass, the distance being directly proportional to time-based sag.
2 more elements
Dependencies are inferred from the claim text.