Oil well cement high-temperature high-pressure compressive stress strain system

Abstract

The invention relates to an oil well cement high-temperature high-pressure compressive stress strain system comprising a cement compression testing module, a power source, a pressure controlling unit, a temperature controlling unit, a signal controlling and processing unit, and pipelines. With the invention, temperature and pressure of bottom hole maintenance can be simulated. The compressive stress of oil well cement stones can be continuously measured under the temperature and pressure, and a temperature-pressure curve and a compressive stress-strain curve can be recorded. With the system and the method, anti-compression properties of different cement slurry systems can be directly measured and compared. The system and the method are beneficial for the design of cement slurry formulas. With the system and the method, cement slurry systems satisfying in-field construction requirements can be obtained.

Description

technical field [0001] The invention belongs to the field of cement stone testing for oil field cementing, and relates to a high-temperature and high-pressure compressive stress-strain system for oil well cement, which can simulate underground static condition maintenance, measure the compressive stress-strain and compressive stress-strain performance of cement stones at different times. Background technique [0002] At present, there are few indoor testing methods for the resistance of cement stone to compressive stress and strain. To a large extent, the test standards of the concrete industry are used for reference, and the function of the measuring instrument is single. Compressive strength, elastic modulus, stress / strain and other technical parameters, the existing measuring equipment such as hydraulic feeding press can only measure the compressive strength of cement stone at normal temperature and pressure, and cannot simulate the measurement of cement stone strength und...

AI Technical Summary

Problems solved by technology

However, it is not suitable for testing under high temperature and high pressure conditions, nor can it achieve high temperature and high pressure curing of cement stones

[0005] "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

[0006] Therefore, the deficiencies of the prior art are reflected in: at present, there are few indoor testing methods for the compressive strength and stress-strain of cement stone, and the function of the measuring instrument is single, and there is no integrated device that can measure the cement stone while maintaining the cement stone Compressive strength, stress and strain and other technical parameters, the existing measuring equipment such as YAW-300BI hydraulic servo press and CSS-2205 electronic universal testing machine, 1 cannot realize the simultaneous compressive strength test, 2 and cannot be used for high temperature and high pressure The measurement under the conditions, 3 can not realize the real-time recording of the experimental data, can not reflect the relationship between stress and strain

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