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Distributed Fiber Optic Sensing for Real-Time Monitoring of Gas in Riser during Offshore Drilling

机译：分布式光纤传感可在海上钻井过程中实时监控立管中的气体

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Effective well control depends on the drilling teams’ knowledge of wellbore flow dynamics and their ability to predict and control influx. Unfortunately, detection of a gas influx in an offshore environment is particularly challenging, and there are no existing datasets that have been verified and validated for gas kick migration at full-scale annular conditions. This study bridges this gap and presents pioneering research in the application of fiber optic sensing for monitoring gas in riser. The proposed sensing paradigm was validated through well-scale experiments conducted at Petroleum Engineering Research & Technology Transfer lab (PERTT) facility at Louisiana State University (LSU), simulating an offshore marine riser environment with its larger than average annular space and mud circulation capability. The experimental setup instrumented with distributed fiber optic sensors and pressure/temperature gauges provides a physical model to study the dynamic gas migration in full-scale annular conditions. Current kick detection methods primarily utilize surface measurements and do not always reliably detect a gas influx. The proposed application of distributed fiber optic sensing overcomes this key limitation of conventional kick detection methods, by providing real-time distributed downhole data for accurate and reliable monitoring. The two-phase flow experiments conducted in this research provide critical insights for understanding the flow dynamics in offshore drilling riser conditions, and the results provide an indication of how quickly gas can migrate in a marine riser scenario, warranting further investigation for the sake of effective well control.
机译：有效的井眼控制取决于钻井团队对井眼流动动力学的了解以及他们预测和控制涌入量的能力。不幸的是，在近海环境中检测天然气涌入尤其具有挑战性，并且没有现有的数据集已针对全尺度环形条件下的天然气涌动进行了验证和验证。这项研究弥合了这一差距，并提出了光纤传感技术在监控立管中气体方面的开拓性研究。通过在路易斯安那州立大学（LSU）的石油工程研究与技术转让实验室（PERTT）的设施进行的大规模实验对这种拟议的传感范式进行了验证，该实验模拟了环形海洋立管环境，该环境的环形空间和平均泥浆循环能力均大于平均水平。装有分布式光纤传感器和压力/温度仪表的实验装置提供了一个物理模型，用于研究在满量程环形条件下的动态气体迁移。当前的脚踢检测方法主要利用表面测量并且不能总是可靠地检测到气体涌入。分布式光纤传感的拟议应用通过提供实时分布的井下数据以进行准确而可靠的监控，克服了常规脚底探测方法的这一关键限制。这项研究中进行的两相流实验为了解海上钻井立管条件下的流动动力学提供了重要的见解，其结果提供了在海上立管情况下气体能够以多快的速度迁移的指示，有必要进一步研究以求有效控制得好。

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