Low-temperature high-pressure rotary viscometer for well cementation cement slurry

Abstract

The invention provides a well cementation cement slurry low-temperature high-pressure rotary viscometer which comprises a viscometer main machine, and the viscometer main machine is arranged on a base and has a certain distance from the base; the measuring cup is arranged below the viscometer main machine; cement paste is contained in the measuring cup and a stratum environment is simulated; the temperature adjusting device is connected with the measuring cup and is used for controlling the temperature in the measuring cup in a low-temperature environment; the pressure device is connected with the measuring cup, controls the pressure in the measuring cup and measures the viscosity of the cement paste in the measuring cup, the low-temperature and high-pressure environment can be simulated for cement paste viscometer performance testing, and the adverse effect of the indoor high-temperature environment on the low-temperature cement viscometer performance testing is avoided.

Description

technical field [0001] The invention relates to a low-temperature and high-pressure rotary viscometer for cementing slurry, in particular to a low-temperature oil well cement slurry viscometer used in laboratory research. Background technique [0002] The cementing project in oil and gas development needs to squeeze the cement slurry. The viscosity characteristics of cement slurry are related to the flow resistance of cement slurry injection during cementing, which affects the displacement efficiency of cement slurry to mud and the quality of cementing, and is an important parameter to determine cementing. As the main thermodynamic parameter of cement hydration, temperature directly determines the evolution of the microstructure and performance of cement paste, and its influence on the viscosity change is very important. [0003] With the continuous expansion of the field of exploration and development, the construction environment of the cementing project is also constantl...

AI Technical Summary

Problems solved by technology

However, most of the conventional instruments used for indoor research on oil well cement in indoor research are designed for room temperature or high temperature conditions, without considering the low temperature environment, and the ambient temperature has a great influence on the performance of the viscometer of cement. Experiments have proved that: for general liquids, when the temperature deviation At 0.5°C, the deviation of the viscosity value of some liquids exceeds 5%, and the temperature deviation has a great influence on the viscosity. As the temperature rises, the viscosity decreases

For cement slurry, temperature not only affects the viscosity, but also affects the hydration process. The cement slurry system suitable for low temperature environments will hydrate too quickly at room temperature, and the viscosity properties change rapidly, which leads to the use of conventional viscometers in the laboratory. Unable to accurately obtain the real low temperature viscometer parameters of cement slurry

[0004] It can be seen that the existing instruments cannot meet the performance test requirements of viscometers for cement slurry below room temperature

At present, the equipment and methods in the field of low-temperature cement testing in my country are still blank, which seriously restricts the research and development of low-temperature cement systems. Therefore, the development of low-temperature cement slurry viscometers is of great significance

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