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Distributed Temperature Sensing Monitoring of Well Completion Processes in a CO2 Geological Storage Demonstration Site

机译:二氧化碳地质封存示范点完井过程的分布式温度传感监控

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摘要

The Distributed Temperature Sensing (DTS) profiles obtained during well completion of a CO2 monitoring well were analyzed to characterize each well completion process in terms of temperature anomalies. Before analysis, we corrected the depth by redistributing the discrepancy, and then explored three temperature calibration methods. Consequently, we confirmed the depth discrepancy could be well corrected with conventional error redistribution techniques. Among three temperature calibration methods, the conventional method shows the best results. However, pointwise methods using heat coil or in-well divers also showed reliable accuracy, which allows them to be alternatives when the conventional method is not affordable. The DTS data revealed that each well completion processes can be characterized by their own distinctive temperature anomaly patterns. During gravel packing, the sand progression was monitorable with clear step-like temperature change due to the thermal bridge effect of sand. The DTS data during the cementing operation, also, clearly showed the progression up of the cement slurry and the exothermic reaction associated with curing of cement. During gas lift operations, we could observe the effect of casing transition as well as typical highly oscillating thermal response to gas lifting.
机译:分析在CO2监测井的完井过程中获得的分布式温度传感(DTS)曲线,以根据温度异常来表征每个完井过程。在分析之前,我们通过重新分配差异来校正深度,然后探讨了三种温度校准方法。因此,我们确认使用常规的误差重新分配技术可以很好地校正深度差异。在三种温度校准方法中,常规方法显示出最好的结果。但是,使用热盘管或井内潜水器的逐点方法也显示出可靠的准确性,这使得它们在常规方法无法承受时成为替代方法。 DTS数据显示,每个完井过程都可以通过其独特的温度异常模式来表征。在砾石充填过程中,由于沙子的热桥效应,可以观察到沙子的进展,并出现清晰的阶梯状温度变化。固井操作期间的DTS数据也清楚地显示了水泥浆的发展以及与水泥固化相关的放热反应。在气举作业期间,我们可以观察到套管过渡的影响以及对气举的典型高振荡热响应。

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