System and method for determining sag propensity
US11733139B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 2022 |
| Grant date | Aug 22, 2023 |
| Priority date | — |
| Expiry date | May 25, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Sag propensity of a fluid can be determined by applying an oscillatory strain at an amplitude in excess of a linear region and below a yield strain of the drilling fluid. This may include use of medium amplitude oscillatory shear (MAOS), from which an elastic modulus of the fluid is determined. The elastic modulus may be determined over time, from which a time to reach maximum elastic modulus can be determined. The time to reach maximum elastic modulus is then converted or correlated to a drilling fluid sag propensity for the drilling fluid either in absolute terms or in relation to base or comparison fluids. Such an evaluation can be performed using a torsional resonance device in which the oscillatory strain is controllable so as to be maintained relatively constant during the measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.