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首页> 外文会议>Geothermal Resources Council Annual Meeting >Calcium- Silicate-Cement Based Blends with Natural Zeolites - Self-Healing Performance under Conditions of High-Temperature Geothermal Wells
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Calcium- Silicate-Cement Based Blends with Natural Zeolites - Self-Healing Performance under Conditions of High-Temperature Geothermal Wells

机译：基于钙硅酸盐基于天然沸石的混合物 - 在高温地热井条件下的自我愈合性能

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Geothermal cements are subjects to thermal and mechanical shocks, high temperatures and aggressive environments that can cause cement damage and compromise well integrity, contaminate underground waters and, if not repaired in time, lead to the well collapse. Repairs of the damaged areas are problematic for subterranean constructions. Self-repairing cements are especially attractive for such applications. This work focuses on calcium-silicate and calcium-aluminate-based cement blends with natural zeolites for enhanced compressive-, bond-strength recoveries and fractures sealing after imposed damage. Three blends of 1) Ordinary Portland cement (OPC) clinker/natural zeolite ferrierite (FER) (commercial name: FlexCem); 2) OPC and natural zeolite clinoptilolite (CLIN); and 3) calcium-aluminum cement-fly ash F-sodium metasilicate with CLIN were tested after initial 1 d-curing at 270 or 300°C followed by imposed compressive damage and additional 5 or 10 d periods under the initial curing conditions for recovery of mechanical properties or cement-carbon steel bond strength by compressive or lap-shear bond strength measurements. The phase compositions and their transformations were studied with x-ray diffraction, differential thermogravimetric analyses, Fourier transform infrared analyses and scanning electron microscopy coupled with energy dispersive x-ray spectroscopy. Zeolites decomposed under high-temperature conditions with release of hydrolysates that along with the hydrating cements participated in the formation of new phases contributing to strength and bond recoveries. These phases included crystalline magnesium and aluminum-containing silicates, calcium and carbonated calcium silicates and amorphous hydrates. The main sealing phases included crystalline and amorphous silica, high-temperature-stable zeolites and talc mineral. Several of the tested formulations showed compressive strength recoveries of more than 100% after repeated damage under the test conditions.
机译：地热水泥受到热电机械冲击，高温和侵蚀性环境，可以导致水泥损坏，妥协良好的完整性，污染地下水，如果没有及时修复，导致井塌陷。受损区域的维修对于地下结构是有问题的。自修复水泥对这些应用特别有吸引力。这项工作侧重于用天然沸石的钙硅酸钙和基于铝酸钙的水泥共混物，用于在施加造成的损伤后提高压缩，粘合强度回收和裂缝密封。三个融合1）普通波特兰水泥（OPC）熟料/天然沸石Ferrierate（FER）（商业名称：FLEXCEM）; 2）OPC和天然沸石Clinophogolite（Clin）; 3）在270或300°C的初始1d固化后，在初始抗压损伤和初始固化条件下进行施加的压缩损伤和初始固化条件，在初始固化条件下进行钙 - 铝水泥 - 粉煤灰F-碳酸钙硅酸钠。通过压缩或搭接剪切粘合强度测量力学性能或水泥 - 碳钢粘合强度。通过X射线衍射，差动热重分析，傅里叶变换红外分析和扫描电子显微镜与能量分散X射线光谱扫描相相组合物及其转化。在高温条件下分解的沸石与水解产物的释放，与水合水泥一起参与形成有助于强度和键回收的新阶段。这些相包括结晶镁和含铝硅酸盐，钙和碳酸钙硅酸钙和无定形水合物。主要密封阶段包括结晶和无定形二氧化硅，高温稳定的沸石和滑石矿。在试验条件下重复损伤后，几种测试制剂显示出抗压强度回收率超过100％。

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