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

RENEWABLE ENERGY

卷:174

Article

Marbun, B. T. H.¹  Sinaga, S. Z.¹  Purbantanu, B. A.¹  Ridwan, R. H.² 

[1] Bandung Inst Technol, Petr Engn Study Program, Bandung, Indonesia

[2] PT Geo Dipa Energi, Jakarta, Indonesia

关键词: Casing;    Drilling break;    Geothermal well;    Lost circulation;    Perforated liner failure;   

DOI  :  10.1016/j.renene.2021.04.054

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free