硅酸盐—硫铝酸盐复合浆液灌注性能与水化协同效应研究

发布时间：2018-04-21 03:29

本文选题：钻孔堵漏 + 硅酸盐水泥　；参考：《成都理工大学》2016年硕士论文

【摘要】：钻孔漏失作为地质钻探工程中最普遍、也最难解决的技术难题之一,严重制约着地质勘探的进展。水泥作为一种传统的灌浆固结材料,广泛应用于地质勘探钻孔灌注堵漏,具有使用方便、利于灌注、性能可调、耐久稳定和经济环保等优点。因此,开展满足复杂地层钻孔堵漏要求的新型水泥基灌注材料研究,对解决复杂地层钻孔堵漏技术难题提供了理论基础与科学依据,为推动地质钻探技术的发展具有重要的研究价值与现实意义。硅酸盐水泥和硫铝酸盐水泥是两种常用于地质勘探钻孔堵漏的无机胶凝材料。但硅酸盐水泥因其稳定性差,凝结时间长,早期强度低,且易被孔内地下水稀释,堵漏效果往往不够理想。硫铝酸盐水泥具有快硬、早强、抗冻和抗渗性能好等优点,然而由于其凝结速度过快,粘度时变特性无法得到良好调控,因而往往也无法达到理想的灌注堵漏效果,并且也存在价格偏贵的问题。为了克服和改善无机胶凝材料在灌注堵漏方面的弱点,国内外专家学者对此进行了大量的探索和研究。复合化是改善水泥灌注性能的有效途径。研究表明,硅酸盐-硫铝酸盐复合浆液具有独特的水化协同效应,表现出了水化凝结速度快、直角稠化、初终凝时间间隔极短等优良的水化凝结特性。因此,开展对硅酸盐-硫铝酸盐复合浆液灌注性能和水化协同效应的研究,可望为解决松散破碎、陡倾宽大裂缝等复杂地层钻孔堵漏技术难题提供全新的思路。论文首先分别对硅酸盐水泥和硫铝酸盐水泥的灌注性能进行了测试分析,并且采用合适的外加剂分别对其进行改性研究,为复合水泥浆液的研究做好了技术准备。论文重点研究了不同配合比的硅酸盐-硫铝酸盐复合水泥浆液的灌注性能,进而通过正交试验确定了灌注性能满足钻孔堵漏要求的硅酸盐-硫铝酸盐复合浆液优化配方。为了进一步探索硅酸盐-硫铝酸盐复合浆液独特的水化协同效应,论文通过采用数字式水泥水化热测量系统测试分析了复合水泥体系的水化放热速率从而间接反映了水泥的水化过程,揭示了复合水泥体系不同于单一体系水泥的水化过程,并且结合扫描电子显微镜以及X射线衍射仪等先进试验仪器,研究了复合水泥体系的微观组构特征,进一步对复合水泥体系的水化硬化机理进行了探究。论文最后结合阳山矿区典型复杂漏失地层,将研制的硅酸盐-硫铝酸盐复合浆液优化配方用于现场钻孔堵漏,并且取得了初步的应用效果,为其在钻探堵漏的进一步应用积累了宝贵的实践经验。论文的研究成果对于今后进一步提高和完善硅酸盐-硫铝酸盐复合体系水泥的灌注性能,具有较为重要的指导和借鉴意义。
[Abstract]:As one of the most common and difficult technical problems in geological drilling engineering, borehole leakage seriously restricts the progress of geological exploration. As a kind of traditional grouting consolidation material, cement is widely used in geological exploration, which has the advantages of convenient use, good for pouring, adjustable performance, durability and stability, economic and environmental protection, and so on. Therefore, the research on new cement-based filling materials to meet the requirements of drilling plugging in complex strata provides a theoretical and scientific basis for solving the technical problems of drilling plugging in complex formations. In order to promote the development of geological drilling technology, it has important research value and practical significance. Portland cement and sulphoaluminate cement are two inorganic cementing materials which are commonly used in geological exploration. However, because of its poor stability, long setting time, low early strength, and easy to be diluted by groundwater in the pore, Portland cement is often not effective enough. Sulphoaluminate cement has the advantages of fast hardening, early strength, good frost resistance and impermeability, etc. However, due to its high setting speed, the time-varying viscosity can not be well regulated, so it is often unable to achieve the ideal filling plugging effect. And there is also the problem of high prices. In order to overcome and improve the weakness of inorganic cementitious materials in perfusion plugging, experts and scholars at home and abroad have carried out a lot of exploration and research. Compounding is an effective way to improve the castability of cement. The results show that the silicate-sulphoaluminate composite slurry has a unique hydration synergistic effect, showing excellent hydration condensation characteristics such as fast hydration setting speed, right angle thickening, and very short initial and final setting time interval. Therefore, the research on the performance of silicate and sulphoaluminate composite slurry and the synergistic effect of hydration are expected to provide a new way of thinking for solving the technical problems of drilling and plugging leakage in complicated strata such as loose fracture and steep sloping wide fracture. Firstly, the performance of Portland cement and sulphoaluminate cement were tested and analyzed respectively, and the proper admixture was used to modify the cement paste, which made the technical preparation for the study of composite cement slurry. The paper focuses on the study of the perfusion performance of silicate-sulphoaluminate composite cement slurry with different mix ratio, and then determines the optimal formula of silicate-sulphoaluminate composite slurry which meets the requirements of drilling and leakage plugging by orthogonal test. In order to further explore the unique hydration synergistic effect of silicate-sulphoaluminate composite slurry, In this paper, the hydration heat release rate of the composite cement system is measured and analyzed by using the digital cement hydration heat measurement system, which indirectly reflects the hydration process of the cement, and reveals that the composite cement system is different from the single cement system in the hydration process. The microfabric characteristics of the composite cement system were studied by combining the advanced testing instruments such as scanning electron microscope and X-ray diffractometer, and the hydration hardening mechanism of the composite cement system was further explored. In the end of this paper, the optimized formula of silicate-sulphoaluminate compound slurry is applied to the field drilling and leakage plugging combined with the typical complex leakage formation in Yangshan mining area, and the preliminary application effect is obtained. It has accumulated valuable practical experience for its further application in drilling plugging. The research results of this paper have important guidance and reference significance for further improving and perfecting the pouring performance of Portland-sulphoaluminate composite cement in the future.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P634.8

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