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YANG Yu, XU Shuanhai, ZHANG Hao, HAN Yongliang, ZHANG Weidong, LI Yongqiang. Preparation Properties and Structure of High Heat Conduction and Low Density Cementing Materials for Geothermal Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(1): 93-101. doi: 10.3969/j.issn.1001-5620.2021.01.016
Citation: YANG Yu, XU Shuanhai, ZHANG Hao, HAN Yongliang, ZHANG Weidong, LI Yongqiang. Preparation Properties and Structure of High Heat Conduction and Low Density Cementing Materials for Geothermal Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(1): 93-101. doi: 10.3969/j.issn.1001-5620.2021.01.016
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Preparation Properties and Structure of High Heat Conduction and Low Density Cementing Materials for Geothermal Wells

doi: 10.3969/j.issn.1001-5620.2021.01.016

  • 1. China Coal Research Institute, Beijing 100013;

  • 2. China Coal Technology & Engineering Group Xi'an Research Institute, Xi'an, shaanxi 710077

  • Received Date: 2020-09-12
    Available Online: 2021-08-16
    Abstract
  • High heat conduction and low density cementing material (HLC) can effectively solve the cementing problem of deep and easy to leak geothermal wells, and can effectively improve the underground heat transfer efficiency of geothermal wells. Through orthogonal test, based on analytic hierarchy process (AHP) and matrix analysis, and considering four indexes of thermal conductivity, 48 h compressive strength, density and cost, the HLC which can be used for cementing of deep geothermal well was prepared. The performance indexes of cementing materials were tested by experiments. The microstructure of HLC was observed by SEM, XRD and MIP, and the mechanism of heat conduction was analyzed. The results show that the HLC formula is: 0.78 water solid ratio, 55% cement, 9% graphite, 25% quartz powder, 2% fly ash, 2% silica fume, 2% fluid loss additive, 3% stabilizer, 1.5% expansion agent and 0.5% retarder; its performance indexes meet the requirements of relevant specifications; the addition of graphite improves the microstructure and pore size distribution of HLC; the heat conduction mechanism conforms to the heat conduction path theory. It can be used for reference for cementing construction and preparation of similar materials in deep geothermal wells.

     

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