Sample P, S1 & S2 Acoustic Velocity Measurement Data

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Data collected for a range of Industry Standard metal plugs Note that he physical properties of each sample e.g. Density, Poisson's Ratio, are all known. Longitudinal (P-wave) and Shear (S-wave) velocities have been accurately calculated for each metal using these properties.

Table 1 clearly shows that the ErgoTech calibration closely agrees (with a maximum error of 2.34%) with the Industry standard data. The Sonic Velocity values measured with the ErgoTech AVS equipment can, therefore, be used with a high degree of certainty. Most standards show a variation of ~1% relative to the published data. This data is taken from both Technisonic and Panametrics equipment manuals. Both companies are world renowned for building high quality Ultrasonic Transducer equipment.

Industry Standard P-wave velocities (m/s):

Material	Technisonic	Panametrics	ErgoTech
Titanium	3100	3120	3184
Aluminium	3100	3130	3066
Brass	2000	2120	2121
Stainless Steel	3100	3120	3196

Industry Standard S-wave velocities (m/s):

Material	Technisonic	Panametrics	ErgoTech
Titanium	6100	6100	6122
Aluminium	6300	6320	6346
Brass	4300	4430	4344
Stainless Steel	5800	5740	5887

Data collected for a range of 37.8mm diameter (1.5inch) rock core plugs.

Core Sample	Waveform	Tblank microsec	Tsample microsec	Lsample mm	Sonic Velocity m/sec	Slowness usec/ft	Slowness usec/mm
Penrith Sandstone plug	P	6.1	23.80	64.57	3648	83.6	0.2741
	S1	7.54	39.10	64.57	2046	149.0	0.4888
	S2	9.41	41.00	64.57	2044	149.1	0.4892
Doddington Sandstone plug	P	6.1	20.20	50.18	3559	85.6	0.2810
	S1	7.54	31.70	50.18	2077	146.8	0.4815
	S2	9.41	32.50	50.18	2173	140.3	0.4601
Gregory Sandstone plug	P	6.1	19.70	50.25	3695	82.5	0.2706
	S1	7.54	30.90	50.25	2151	141.7	0.4649
	S2	9.41	32.60	50.25	2167	140.7	0.4615
Heughall Limestone plug	P	6.1	20.80	50.42	3430	88.9	0.2916
	S1	7.54	31.10	50.42	2140	142.4	0.4673
	S2	9.41	33.20	50.42	2119	143.8	0.4718

 

Sample Name : Tblank (face to face) 6Nm Torque t
P wave
	Experimental Information: Axial Load:                   6.33 MPa (7.22 kN) Confining Load:            N/A Temperature:              20.7ºC Sample Length :          0.0 mm
S1 wave	S2 wave
Sample Name : Tblank (face to face)  with lead foil.  6Nm Torque.
P wave
	Experimental Information: Axial Load:                   4.33 MPa (4.94 kN) Confining Load:          N/A Temperature:              19.9ºC Sample Length :          0.1 mm
S1 wave	S2 wave
Sample Name : Doddington Sandstone with lead foil. 6Nm Torque.
P wave
	Experimental Information: Axial Load:                   9.56 MPa (10.9 kN) Confining Load:            N/A Temperature:              20.4ºC Sample Length :          50.18mm
S1 wave	S2 wave
Sample Name : Heughall Limestone with lead foil. 6Nm Torque.
P wave
	Experimental Information: Axial Load:                   4.46 MPa (5.08 kN) Confining Load:    N/A Temperature:              20.4ºC Sample Length :          50.42mm
S1 wave	S2 wave

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