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Method for analyzing physical properties of materials

  • US 5,741,971 A
  • Filed: 01/17/1996
  • Issued: 04/21/1998
  • Est. Priority Date: 01/17/1996
  • Status: Expired due to Fees
First Claim
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1. A method for simulating a sample of cement contained within a well in a subterranean formation, comprising:

  • maintaining the sample in a housing having walls including a wall variable in position to vary the housing length and volume in response to expansion or contraction of the sample;

    controlling the temperature and pressure of the sample at the temperature and pressure prevailing within the well;

    transmitting an ultrasonic signal through the sample length following such expansion or contraction;

    detecting the ultrasonic signal subsequent to its transit through the sample length;

    measuring and recording the time required for the signal to transit the sample length;

    measuring and recording any changes in the sample length through which the ultrasonic signal passes; and

    determining the ultrasonic velocity of the ultrasonic signal by a predetermined relationship of ultrasonic velocity with the transit time of the ultrasonic signal and the measurement of the length of the sample through which the ultrasonic signal passes; and

    non-destructively characterizing the changes in one or more certain parameters over a period of time and relative to the temperature and pressure within the well, said parameters including the density, viscosity, degree of cement slurry thickening, cement shrinkage or expansion, cement compressive strength, and dynamic Young'"'"'s Modulus, from predetermined relationships between the above-listed parameters with the measurements of the ultrasonic signal transit time and the measurements of the sample lengths through which the ultrasonic signals pass.

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