Device and method for measuring volume change of liquid-plastic-solid three-state during cement hydration

Abstract

The invention provides a test device for the volume change of liquid-plastic-solid three states in the process of cement hydration, which includes a sealed slurry cup for containing cement slurry, and a shearing device for collecting the shear wave of cement slurry is installed on the sealed slurry cup. Wave acquisition device, longitudinal wave acquisition device for collecting longitudinal waves of cement slurry, pressure control system for controlling the pressure inside the sealed slurry cup, volume acquisition system for measuring the volume change of cement slurry in the sealed slurry cup, and a device for heating the slurry Heating measurement device; the shear wave acquisition device, longitudinal wave acquisition device, pressure control system, volume acquisition system, and heating measurement device are connected to a computer system. The invention can not only accurately measure the volume change of the cement slurry in three stages of liquid state, plastic state and solid state, but also facilitate monitoring which stage the expansion agent mainly acts on in the volume shrinkage of the cement slurry, which is important for the evaluation and optimization of the expansion agent meaning.

Description

technical field [0001] The invention relates to the technical field of oil drilling and cementing engineering, in particular to a testing device and method for the volume change of liquid-plastic-solid three-state during cement hydration. Background technique [0002] During the cementing process, the cement slurry is filled in the annular space between the casing and the wellbore, and the cement sheath formed after solidification and solidification supports the well wall, protects the casing, and seals the oil and gas water layer. Usually, the cement slurry itself will produce volume shrinkage, which leads to the failure of the cementation quality of the cement ring in the later stage, causing problems such as interlayer channeling and annular pressure. By monitoring the time-varying process of the volume shrinkage of the cement slurry, it is of great significance to rationally develop the expansion cement slurry system and solve the problem of the volume shrinkage of the c...

AI Technical Summary

Problems solved by technology

After many years of research and development, great progress has been made in cement slurry volume shrinkage testing devices at home and abroad (for example: Wang Xiaojing. A kind of high temperature and high pressure volume expansion and contraction tester for oil well cement: CN102928578A, Li Ning. Cementing cement slurry volume change test Instrument and test method: CN103245773A, Zhang Hua. Volume expansion and contraction rate test device: CN205138938U etc.), although these devices can realize the measurement to the cement slurry volume shrinkage, can't distinguish liquid state, plastic state, three phases of solid state cement slurry Volume shrinkage. At present, there is no reliable test method for cement slurry plastic shrinkage and hardened body shrinkage, and it is impossible to accurately and effectively test the liquid-plastic-solid three-state volume change during the cement slurry hydration process.

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