Hydration induced morphological change on proppant surfaces employing a calcium-silicate cement system
Hydration induced morphological change on proppant surfaces employing a calcium-silicate cement system
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DOI：
10.1016/j.colsurfa.2017.10.006
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Covadonga Correas;Kourtney D. Wright;E. Andreoli;Z. Almutairi;B. Sandnes;A. Barron
中科院分区：
文献类型：
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作者：
Covadonga Correas;Kourtney D. Wright;E. Andreoli;Z. Almutairi;B. Sandnes;A. Barron
商用铝硅酸盐支撑剂颗粒被Ca-Si氧化物包裹，目的是提供原位增加的角度（降低克伦拜因圆度值），以促进其固定化。采用(a) CaCO3, (b) CaCO3+正硅酸（Si(OH)4， SA）和(C) CaCO3+熔融二氧化硅（SiO2， FS），通过溶胶-凝胶法合成了Ca-Si氧化物体系，并在1200℃下进行了固化和烧结。当支撑剂在碳酸钙和硅酸的存在下固化时，涂层的成分发生了显著的变化，而烧结则导致固化样品转化为具有理想“爆米花”形状的陶瓷团块。在Si试剂存在的情况下获得了最好的效果，这些烧结支撑剂的水化作用可以显著增加支撑剂的角度，这是一种理想的转变，可以使支撑剂在进入储层后锁定到位。通过扫描电子显微镜（SEM）、相关能谱（EDX）、x射线光电子能谱（XPS）、x射线衍射（XRD）和红外（IR）对样品在制备的各个阶段进行了表征。
Commercial aluminosilicate proppant particles have been coated with Ca-Si oxides, with the aim to provide an in-situ increase in the angularity (decrease in Krumbein roundness value) to facilitate their immobilization. Ca-Si oxide systems have been synthesized via sol-gel, cured, and sintered at 1200 °C using (a) CaCO3, (b) CaCO3+ orthosilicic acid (Si(OH)4, SA), and (c) CaCO3+ fused silica (SiO2, FS). When the proppant is cured in the presence of CaCO3and silicic acid the coatings undergo a significant compositional change, while sintering results in the conversion of the cured samples to ceramic agglomerates with the desired “popcorn” shapes. The best results are obtained in the presence of Si reagents, and hydration of these sintered proppants allows for a distinct increase in the angularity, which is the desired transformation to allow the proppant to be locked-in-place once located in the reservoir. The samples have been characterized at each stages of preparation by scanning electron microscopy (SEM) with associated energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and infrared (IR) spectroscopy.