基于响应面法的地热钻采碳纳米管复合水泥基材料的研究

摘要/Abstract

摘要： 针对现有导热固井水泥存在的性能不足问题,本文研制了一种新型地热钻采碳纳米管复合水泥基材料(CNTs-CC)。首先,选用石墨、氮化硅作为主要导热填料,硅微粉作为热稳定材料,碳纳米管作为协同增强填料,初步研制出纳米复合水泥材料基础液;其次,基于响应曲面法Box-Behnken试验设计,开展17组配比优化试验,构建了以2 d抗压强度和导热系数为响应指标的二次多项式预测模型,结合方差分析和响应曲面考察了各因素对响应指标的影响,并得到胶凝材料最优配比;最后,对复合水泥基材料的工程性能进行评估,并结合XRD与SEM研究了材料的水化机理。结果表明:复合水泥基材料的导热性能与抗压强度受多因素交互作用影响,其中早强剂与减水剂交互影响显著;CNTs-CC水泥石28 d抗压强度达8.15 MPa,导热系数为2.236 W/(m·K);导热填料不参与水化过程,碳纳米管粉可发挥“填充”及“桥连”效应,外加剂调控水化进程。

关键词: 地热钻采, 水泥基材料, 石墨, 氮化硅, 碳纳米管, 响应曲面, 水化

Abstract: A novel carbon nanocomposite cement-based material for geothermal drilling and production (CNTs-CC) was developed to solve the problem of insufficient performance of existing thermal cementing cement. Firstly, with graphite and silicon nitride as main thermal conductivity filler, silicon powder as heat stabilization material and carbon nanotubes as co-reinforcing filler, the nano composite cement material base liquid was preliminarily developed. Secondly, based on the Box-Behnken experiment design of response surface method, 17-sets of ratio optimization experiments were carried out, and a quadratic polynomial prediction model with 28 d compressive strength and thermal conductivity as the response indexes was constructed. The influences of various factors on the response indexes were investigated by combining analysis of variance and response surface, and the optimal ratio of cementable materials was obtained. Finally, the engineering properties of the cement-based composite materials were evaluated, and the hydration mechanism of the cement-based composite materials was studied by XRD and SEM. The results show that the thermal conductivity and compressive strength of cement-based composite materials are influenced by the interaction of many factors, in which the interaction between early strength agent and water reducing agent is significant. The 28 d compressive strength of CNTs-CC cement stone is 8.15 MPa, and the thermal conductivity is 2.236 W/(m·K). The thermal conductive filler does not participate in the hydration process, and the carbon nanotube powder can play a "filling" and "bridging" effect, and the admixture regulates the hydration process.

Key words: geothermal drilling and production, cement-based material, graphite, silicon nitride, carbon nanotube, response surface, hydration

中图分类号:

TQ172

向杰, 王胜, 李玉杰, 王文杰. 基于响应面法的地热钻采碳纳米管复合水泥基材料的研究[J]. 硅酸盐通报, 2024, 43(2): 495-508.

XIANG Jie, WANG Sheng, LI Yujie, WANG Wenjie. Carbon Nanocomposite Cement-Based Materials for Geothermal Drilling and Production Based on Response Surface Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 495-508.

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