Shock Tube

General Information

Instruments:
Shock Tube.

Description:
In this set-up, dispersive properties of surface acoustic waves propagating along poroelastic media and fractures are studied experimentally and theoretically. These waves carry information on the permeability and fluid fill of the reservoir. The heterogeneity and fractured formations strongly affect the wave interpretation techniques. These effects are studied in the shock tube set-up, where surface waves are generated by means of shock impact. 

Location:
Laboratory of Geoscience and Engineering, Faculty of Civil Engineering and  Geosciences, Stevinweg 1, Delft (Building #23).

Key Words:
Surface acoustic waves, Porous media, Fractures, Wave attenuation.

Main Application:
The main application of the shock tube set-up is for borehole logging and fracture determination.

Instrument Specification:

• Length of the shock tube: 7.4 m

• Inner diameter of the shock tube: 77 mm

• Wall thickness of the shock tube: 2.5 cm

• Pressure transducer type: Kistler transducer, Druck PDCR81 sensor

• Data acquisition system: Four-channel LeCroy 6810

• Amplifier type: Kistler 5001

• Evacuation system: Rotary QDP80 Drystar Pump (4 kW), Evacuation vessel

References:

• Fan, H., and D.M.J. Smeulders (2013). Shock–induced wave propagation over porous and fractured borehole zones: Theory and experiments. J. Acoust. Soc. Am., 134, 4792–4800.

• Chao, G., D.M.J. Smeulders, and M.E.H. van Dongen (2006). Measurements of shock-induced guided and surface acoustic waves along boreholes in poroelastic materials. J. Appl. Phys., 99, 094904.

• Wisse, C.J., D.M.J. Smeulders, M.E.H. van Dongen, and G. Chao (2002). Guided wave modes in porous cylinders: Experimental results. J. Acoust. Soc. Am., 112(3), 890-895. 

• Smeulders, D.M.J., and M.E.H. van Dongen (1997). Wave propagation in porous media containing a dilute gas-liquid mixture: theory and experiments. J. Fluid Mech., 343, 351–373.

• Van der Grinten, J.G., M.E.H. van Dongen, and H. van der Kogel (1985). A shock–tube technique for studying pore–pressure propagation in a dry and water–saturated porous medium. J. Appl. Phys., 58, 2937–2942