High-temperature high-pressure tensile stress strain system of oil well cement and test method thereof

Abstract

The invention relates to a high-temperature high-pressure tensile stress strain system of oil well cement. The system comprises a cement tensile test assembly, a power supply and pressure control unit, a temperature control unit, a signal control processing unit and pipelines. By adopting the system of the invention, the temperature and the pressure for the bottom maintenance can be simulated, the tensile stress strain of the oil well cement can be continuously measured under conditions of the temperature and the pressure, and the temperature pressure curve and the tensile stress strain curve are recorded. The system and the measure method of the invention are in favor of the intuitional test, the comparison of tensile resistances of different cement paste systems and the design of the cement paste formula, so cement paste systems which can satisfy on-site construction requirements are obtained.

Description

technical field [0001] The invention belongs to the field of cement stone testing for oilfield cementing, and relates to a high-temperature, high-pressure tension-compression stress-strain system for oil well cement, which can simulate underground static condition maintenance and measure the tensile strength and tensile stress-strain of cement stone at different times. Background technique [0002] In the prior art, there are few indoor test methods for the stress-strain tensile test and tensile strength of oil well cement stones. To a large extent, the test standards of the concrete industry are used for reference. The function of the measuring instrument is single, and there is no integrated equipment that can Measure the technical parameters such as the stretching of cement stone under the temperature and pressure of curing cement stone. Although the existing measuring equipment such as cement flexural / tensile tester can measure the tensile strength of cement stone, the co...

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Problems solved by technology

However, the stress-strain curve cannot be directly obtained, and the cement stone cannot be cured under pressure, nor can it be tested for the tensile strength of the cement stone under high temperature and high pressure.

[0007] "Multifunctional Portable Material Testing Machine" (ZL Patent No. 93211524.1): This invention can complete tensile compression, shearing, torsion and other experiments, but it is not suitable for testing under high temperature and high pressure conditions, nor can it realize high temperature and high pressure on cement stone conservation

[0008] Therefore, the deficiencies of the prior art are as follows: at present, there are few indoor testing methods for the tensile stress and strain resistance of cement stones, and the function of the measuring instrument is single. Tensile strength, tensile stress and strain and other technical parameters, existing measuring equipment such as EL39-7100 / 01, EP-05060 cement flexural / tensile tester, QJ210A tensile modulus of elasticity tester, 1 cannot be realized simultaneously Tensile strength test, 2 and cannot be used for measurement under high temperature and high pressure conditions, 3 can not achieve real-time recording of experimental data, can not reflect the relationship between stress and strain

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