论文部分内容阅读
润湿性是共存于一个系统的一个流体在另一个流体存在时润湿固体表面的相对趋势。油湿岩石大部分是裂缝性碳酸盐岩地层,如果岩石润湿性改变,通过自然的渗吸其采油效率就能得到改进。在这一研究中,用接触角测量结果来研究在原油中和暴露于蒸汽中的老化时间对方解石、云母、石英和玻璃表面润湿性的影响。同时研究了用不同的溶剂冲洗老化的表面对润湿性的影响,用此来检查在这项工作中使用的方法和接触角测量过程的准确性。当在原油中老化的矿物表面暴露于蒸汽时,观察到润湿性转换的不同结果。石英、方解石和玻璃表面恢复到它们原来的水湿度,而云母表面显示向增加的油湿状态变化的趋势。在这些试验过的矿物中,当暴露于蒸汽中时方解石表面的润湿性转换最小。同样,应用玻璃微模型研究注蒸汽和热水对润湿性的影响。在微模型中的流体分布和残余油饱和度,当注入蒸汽和热水时润湿性向水润湿变化。
Wettability is the relative tendency of one fluid coexisting in one system to wet a solid surface in the presence of another fluid. Most of the oil-wet rocks are fractured carbonate formations, and if the rock’s wettability changes, its oil production efficiency can be improved by natural imbibition. In this study, contact angle measurements were used to investigate the effect of aging time in crude oil and exposure to steam on wettability of calcite, mica, quartz and glass surfaces. The impact of aging the surface with different solvents on wettability was also examined to check the accuracy of the method used in this work and the contact angle measurement process. When the surface of the aged mineral in the crude oil is exposed to steam, different results of the wetting transition are observed. Quartz, calcite, and glass surfaces returned to their original moisture, while the mica surface showed a tendency to change toward an increased oil wet state. In these tested minerals, the wettability of the calcite surface is minimized when exposed to steam. Similarly, the effect of steam injection and hot water on wettability was studied using glass micromodels. Fluid distribution and residual oil saturation in the micromodel, wettability changes to water wetting when injected with steam and hot water.