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首页> 外文会议>Geothermal Resources Council annual meeting >Wellhead-based Casing Integrity Assessment and Monitoring
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Wellhead-based Casing Integrity Assessment and Monitoring

机译：基于井口的套管完整性评估和监控

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Wellbores provide subsurface access for resource extraction, storage and waste disposal. They are often challenged by complex and aggressive mechanical and geochemical conditions, affecting their integrity, efficiency and reliability. This is exacerbated in geothermal fields due to the extreme temperature conditions at depth, repeated thermal cycling, fluid manipulation and the presence of corrosive chemicals. Wellbore integrity is of paramount importance to safe and effective geothermal energy extraction. Assessments for wellbore integrity relies almost entirely on downhole logging tools currently. Such tools typically require borehole occupation which interrupts the operation of the wells. Because of the relatively high cost, these measurements are only performed occasionally, typically when problems are suspected, limiting their usefulness for borehole degradation trajectory prediction for potential failure warning. We developed and tested a new generation of borehole monitoring tools using only wellhead based approaches. These approaches are (1) non-intrusive and does not require behind-casing or in-casing sensor installation or deployment; (2) cost effective, which allows frequent monitoring of the well during its life cycle; and (3) fast and easy to use, which facilitates its better acceptance and application by regular customers. Our approach integrates transient and steady state electromagnetism (EM), tubular seismic wave propagation and electrochemical sensing. Specifically, steady state EM and electrochemical sensing can provide fast and low cost casing integrity screening, and guided transient EM and tubular seismic wave sensing can provide higher precision targeting of wellbore irregularity in geothermal wells. Both experimental and numerical experiments were conducted at both laboratory and field scales, and our results demonstrated the sensitivities of these approaches to casing length and damage induced geophysical anomalies. These results revealed the potential of these approaches which could lead to a new set of non-invasive, fast and economic tools for borehole integrity accessed in geothermal as well as other subsurface applications.
机译：井筒为资源开采，储存和废物处置提供了地下通道。它们通常面临复杂而激进的机械和地球化学条件的挑战，从而影响其完整性，效率和可靠性。由于深度处的极端温度条件，反复的热循环，流体操纵以及腐蚀性化学物质的存在，这在地热领域中加剧了。井筒完整性对于安全有效的地热能开采至关重要。目前，对井眼完整性的评估几乎完全依赖于井下测井工具。这样的工具通常需要钻孔占用，这会中断井的运行。由于相对较高的成本，这些测量仅偶尔进行，通常在怀疑有问题时进行，从而限制了它们对潜在故障预警的井眼退化轨迹预测的有用性。我们仅使用基于井口的方法开发并测试了新一代的井眼监测工具。这些方法是（1）非侵入性的，不需要后装式或内装式传感器的安装或部署; （2）具有成本效益，可以在其生命周期内进行频繁的监控; （3）快速且易于使用，这使其更易于为普通客户所接受和应用。我们的方法集成了瞬态和稳态电磁（EM），管状地震波传播和电化学传感。具体而言，稳态EM和电化学感应可提供快速且低成本的套管完整性筛选，而引导瞬态EM和管状地震波感应可提供更高精度的地热井井眼不规则目标。在实验室和现场规模上都进行了实验和数值实验，我们的结果证明了这些方法对套管长度和损伤引起的地球物理异常的敏感性。这些结果揭示了这些方法的潜力，这些方法可能会导致一套新的非侵入性，快速且经济的工具，用于在地热以及其他地下应用中获得井眼完整性。

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