Testing apparatus and method of deriving Young's modulus from tensile stress/strain relationships
AssigneeBJ Services Company
InventorsVirgilio Go Boncan, Murray J. Rogers, Thomas Heinold, Robert L. Dillenbeck
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Abstract
A method of testing and a tester apparatus to determine the axial stress and strain of cements under the temperature and pressures encountered by cement during use in wellbore environments. Using these stress and strain measurements, the Young's Modulus may be established for a material at the encountered temperature and pressure of the wellbore. By combining static tensile strength testing and elasticity measurements of cements, Young's Modulus values for different cement compositions under stresses that are similar to the conditions occurring in an actual wellbore are possible.
Claims8
A tester capable of determining Young's modulus for a cement specimen comprising:
- a pressure chamber;
- at least one mold body disposed in the pressure chamber, wherein the mold comprises:
- a stationary portion of the mold body;
- a pulled portion of the mold body;
- a follower attached to the pulled portion of the mold body capable of imparting axial stress and axial strain on the specimen;
- a ram capable of producing a load at a predetermined rate that is transferred to the follower;
- a load cell capable of measuring axial stress on the specimen;
- a linear displacement transducer capable of measuring axial strain on the specimen;
- a least one data acquisition unit capable of recording the axial stress and axial strain on the specimen.
Dependencies are inferred from the claim text.