cast-in-place foamed cement for pipes at medium and high temperatures
Description
Transient thermal conductivity and heat transfer test data of foamed concrete in medium and high temperature pipelines.
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Steps to reproduce
The test was selected to set up the oil well pipe and add insulation for the cast-in-place foam cement insulation performance test. The test program was as follows (1) A plastic pipe is set outside the oil well piping, filled with cast-in-place foam cement, and the inside of the pipe is filled with fluid and heated at a set temperature as a heat source. (2) Multiple temperature measuring points are set in the test. Two monitoring points are respectively set on the inner wall of foamed cement (outer wall of oil well pipe) and the outer wall of foamed cement (inner wall of plastic pipe), and temperature detection points are set on the outer wall of plastic pipe and standby measuring points are set. Thermocouples are fixed on the corresponding measuring points on the same horizontal line along the same height with tape, as shown in Fig. 3. The measuring points are sequentially numbered and connected to the Agilent data acquisition instrument, As shown in Fig. 4, conduct long-term temperature monitoring, set 10s as the interval of once reading temperature data, and obtain test data. During the test, due to the long pipe, the liquid in the pipe is heated slowly and the temperature is uniform. Therefore, the vertical influence along the pipe is not considered in the heat transfer process, and only the horizontal radial transient heat transfer is considered. (3) The test time was selected as winter in Daqing, China, and the following experiments were conducted to investigate the thermal insulation performance of cast-in-place foamed cement: ①Heating test: first of all, turn on the heat source, set the temperature of the heat source, over the instrument to monitor the data of each measurement point, calculate the temperature difference between the inner and outer walls of the insulation layer, the temperature difference between the inside and outside of the plastic pipe and other data to analyze the changes in the thermal insulation performance under the heating condition. ②Long-term operation test: by setting the same heat source temperature, a long time through the instrument to monitor the data of each measurement point, monitoring the temperature experimental data in different heat source temperatures under long-term operation, to analyze the thermal insulation material in long-term use after the decline in thermal insulation performance. （4）The experimental data obtained from the computational tests were collated, and the transient thermal conductivity of the insulation materials was calculated and analyzed.