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Improvement of loads calculation of the perforated liner in a geothermal production well

机译：改善地热量生产中穿孔衬垫的负荷计算

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The integrity of perforated liners is crucial in geothermal production wells and this should be well designed according to correct standards. The available geothermal standards, such as the New Zealand Standard, NZS2403:2015, provides a general but less detailed discussion of geothermal perforated liner system design considerations. This research aimed to improve the limitations of NZS2403:2015 by calculating and evaluating the dynamic loads of perforated liner during four phases: borehole drilling and liner installation, flow testing, stand-alone production, and production during the injection operation. The data from production well HCE29 and injection well HCE29A, Dieng Field, Indonesia, were used in this research. In every phase, perforated liner yield strength changed, and load mechanisms varied between 1.3-2.7 and 1.6-4.6 times of the actual liner burst and collapse strength, respectively, and these lead to perforated liner failure and its lifetime reduction. The calculation results, combined with the significant production decline and production casing failure, indicated the perforated liner failure. The results also showed when it was mandatory to revise operation at later phases and to conduct appropriate maintenance according to actual perforated liner condition. Furthermore, this study can be used as a basis of future wells design and operation related to perforated liner.(c) 2021 Elsevier Ltd. All rights reserved.
机译：穿孔衬里的完整性在地热生产井中至关重要，这应该根据正确的标准设计。可用的地热标准，如新西兰标准，NZS2403：2015，提供了对地热穿孔衬垫系统设计考虑的一般但不太详细的讨论。该研究旨在通过计算和评估四个阶段的穿孔衬里的动态载荷来改善NZS2403：2015的局限性：钻孔钻孔和衬垫安装，流动测试，独立的生产和在注射操作期间的生产。在本研究中使用了来自生产井HCE29和注射井HCE29a，Dieng Fieldia的数据。在每个阶段，穿孔衬里屈服强度改变，并且分别的负载机制变化在实际衬里突发和塌陷强度的1.6-2.7和1.6-4.6倍之间，并且这些导致穿孔衬垫故障及其寿命减少。计算结果，结合显着的生产下降和生产套管衰竭，表示穿孔衬垫故障。结果还表明，何时强制修改后期阶段并根据实际穿孔衬垫条件进行适当的维护。此外，该研究可作为与穿孔衬里相关的未来井设计和操作的基础。（c）2021 Elsevier Ltd.保留所有权利。

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