Using typical values of drilling mud plastic viscosity in the Navier-Stokes equations yields attenuation coefficients orders of magnitude smaller than those observed. To explain this, ultrasonic velocity and attenuation were measured in high density water- and oil-based using pulse-echo amplitude detection. Rather than increasing with mud weight or plastic viscosity above 14 lb/gal as expected, the 280 KHz attenuation peaked in 15 lb/gal mud and decreased monotonically in the higher density muds. When 180 KHz was tested, the attenuation peak position and shape showed frequency dependence similar to those associated with ultrahigh viscous relaxation.
Ultrasonic velocity and attenuation measurements in high density drilling muds
1998
Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
Density and velocity measurements in high speed flows
AIAA | 1968
|Density and velocity measurements in high-speed flows.
AIAA | 1968
|