提出了一种使用聚酰亚胺涂敷、低羟基高纯石英玻璃微结构的散射增强型微结构光纤，用于监测和评估油井开采中水力压裂技术的过程与效果，该光纤对高温、高湿度、富氢环境有较好的耐受力。通过分布式传感系统测量了该光纤的散射增强效果，当光纤损耗为3 dB/km时，测量精度可以提高2~5倍，在实际油井压裂监测中，微结构光纤分布式传感系统数据结果显示，可以对压裂效果实现监测并进一步指导压裂和暂堵工作。
This paper presents several high-temperature resistance polyimide coated microstructured optical fibers, with enhanced scatterings benefited from the specially designed fiber structures. Beyond that, these fibers also possess high resistance to humidity and a long lifetime in hydrogen-rich environments. Using one of these fibers, we study the scattering enhancement in a distributed sensor system. When the fiber loss is 3 dB/km, the measurement accuracy can be effectively improved by 2~5 times. Further testing this system for fracturing monitoring in oil wells, the collected data from the sensing system prove that the underneath fracturing can be monitored and be further used for supervising fracturing and temporary plugging operations.
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