Experimental device for testing cement hydration heat

Abstract

The invention relates to an experimental device for testing cement hydration heat. The device comprises a heat preservation container 10, a heating sheet 9, a closed kettle cover 2, a sample cylinder 1, a temperature sensor 6, a control panel 11, a booster pump 14, an analog-to-digital converter 18 and a computer 19. The heating sheet 9 is arranged on the inner wall of the heat preservation container 10, the closed kettle cover 2 is arranged at the top of the heat preservation container 10, and the sample cylinder 1 is fixed at the bottom through a support frame; heat conduction oil is arranged between the heat preservation container and a sample cylinder, the closed kettle cover and the sample cylinder cover are respectively provided with a small hole with threads, the small holes are used for fixing a temperature sensor 6 through a hexagon nut and a sealing ring, and the temperature sensor inserted into the sample cylinder is connected with the analog-to-digital converter 18 and the computer 19 through a connecting port; the heat preservation container is connected with the booster pump 14; and the heating sheet and the booster pump are both connected with a control panel 11. The underground high-temperature and high-pressure environment of a cement paste can be simulated, the internal heat loss is controlled, the heat release condition of the cement paste in the high-temperature and high-pressure environment is mastered, and the adverse effect on well cementation construction caused by too fast heat release of the paste is avoided.

Description

technical field [0001] The invention relates to the technical field of cementing slurry detection, in particular to an experimental device for testing the hydration heat of cement slurry in a high-temperature and high-pressure environment. Background technique [0002] During the cement hydration process, a series of chemical reactions will occur between the components in the cement and water, and a large amount of heat will be released. Excessive heat release will easily lead to a large temperature difference between the inside and outside of the slurry, and the internal thermal stress will increase, resulting in an increase in the porosity and permeability of the cement stone, which is not conducive to the development of mechanical properties. Therefore, it is of great significance to monitor the internal temperature of cement slurry in real time. At present, there are two methods commonly used to measure the exothermic properties of cement hydration, namely chemical solu...

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Problems solved by technology

"A heat-insulating concrete hydration heat temperature rise measuring device" (CN205333552U) can effectively insulate concrete samples, reduce heat loss, and is easy to operate, but its temperature and pressure conditions are very limited, and the experimental results obtained The results are all tested at normal temperature and pressure, which cannot meet the high temperature and high pressure environment of cement slurry in deep wells

"A detection device for quickly testing the heat of hydration of high-performance concrete" (CN207351938U), which is simple in operation and low in cost, but it is not easy to keep the external temperature at a constant temperature, because the cement does not release much heat during the initial hydration process. The temperature change of the sample is not obvious. If the sample temperature change is directly used as a characterization of the hydration exothermic characteristics, it will often be affected by the slow and small changes in the ambient temperature. Therefore, when measuring the initial hydration exothermic characteristics of cement, it is necessary to maintain The external ambient temperature is in a constant state

"A waterproof sealing device for cement hydration heat test" (CN203173080U) has a good sealing effect, but its temperature sensor is fixed by a cork, and the cork is prone to deformation after long-term use, and the hole in the middle will change with time. It becomes larger with the increase of the number of uses, the later fixation effect is not obvious, the replacement frequency is high, and the use cost is high

At the same time, the cork is very easy to rotate or move up and down, which will easily cause the internal part of the slurry to dissipate heat, thus affecting the accuracy of the experimental results

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