Apparatus and method for determining mechanical properties of cement for a well bore
First Claim
1. An apparatus for testing mechanical properties of a sample cement composition, comprising:
- an annular test chamber;
a variable stress system in communication with the annular test chamber, the variable stress system operable to control pressure applied to a sample cement composition in the annular test chamber during and after curing of the sample cement composition; and
one or more sensors coupled to the annular test chamber, the sensors operable to sense at least one of stress, strain and displacement from the sample cement composition in response to one or more changes applied to the annular test chamber by the variable stress system for determination of at least one mechanical property of the sample cement composition.
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Abstract
Apparatus for testing mechanical properties of a sample cement composition. The apparatus includes an annular test chamber and a variable stress system. The variable stress system communicates with the annular test chamber. The variable stress system is operable to control at least one of temperature or pressure applied to the sample cement composition in the annular test chamber during and after curing of the sample cement composition. One or more sensors are coupled to the annular test chamber. The sensors are operable to sense at least one of stress, strain and displacement from the sample cement composition in response to one or more changes applied to the annular test chamber by the variable stress system for determination of at least one mechanical property of the sample cement composition.
129 Citations
20 Claims
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1. An apparatus for testing mechanical properties of a sample cement composition, comprising:
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an annular test chamber; a variable stress system in communication with the annular test chamber, the variable stress system operable to control pressure applied to a sample cement composition in the annular test chamber during and after curing of the sample cement composition; and one or more sensors coupled to the annular test chamber, the sensors operable to sense at least one of stress, strain and displacement from the sample cement composition in response to one or more changes applied to the annular test chamber by the variable stress system for determination of at least one mechanical property of the sample cement composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for determining mechanical properties for a sample cement composition, comprising:
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curing a sample cement composition at well bore pressure conditions in an annular test cell; and determining one or more mechanical properties of the sample cement composition based on at least one of stress, strain and displacement measurements from the sample cement composition in response to one or more pressure changes applied to the sample cement composition in the annular test cell. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for testing mechanical properties of cement for a well bore, comprising:
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sealing a sample cement composition in an annular test cell; applying a curing pressure and temperature to the sample cement composition in the annular test cell; measuring volume change to the sample cement composition in the annular test cell during curing; measuring at least one of stress, strain and displacement from the sample cement composition in the annular test cell during curing; changing pressure applied to the sample cement composition in the annular test cell in one or more steps; and measuring changes in at least one of stress, strain and displacement from the sample cement composition in the annular test cell caused by the pressure changes. - View Dependent Claims (20)
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Specification