Integrity issues create challenges for maintaining the production of mature geothermal wells. Such problems are likely to occur in wells designed according to oil and gas standards, without considering the extreme geothermal environment. PT Geo Dipa Energi as the operator of the Dieng geothermal field, one of the longest operated in Indonesia, has experienced this difficulty since acquiring the field. Almost half of the production wells have been abandoned because of casing issues. To increase production, the operator plans to reactivate wells that have been previously abandoned. An initial study was performed to assess the technical feasibility of reactivating wells at Dieng; it included the development of a well assessment methodology including casing design, comprising historical data analysis, identification of well problems, and investigation of well integrity. The study focused on the identification and characterization of two abandoned wells, HCE9B and HCE28B, current casing conditions, limitations, and challenges to perform a well intervention and workover which is realistic, measurable, economic, and technically feasible. The result of this study will be applicable for casing design for future wells.

中文翻译：

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印度尼西亚Field Dieng长期遗弃的地热井的套管破坏识别

完整性问题对维持成熟的地热井的生产提出了挑战。在不考虑极端地热环境的情况下，按照石油和天然气标准设计的井中很可能会发生此类问题。PT Geo Dipa Energi作为Dieng地热田的运营商，是印度尼西亚运营时间最长的地区之一，自从获得该领域以来就经历了这一困难。由于套管问题，几乎一半的生产井已被废弃。为了提高产量，操作员计划重新激活以前废弃的井。进行了一项初步研究，以评估在Dieng重新启用油井的技术可行性；它包括开发井评估方法，包括套管设计，包括历史数据分析，确定井问题，以及对油井完整性的调查。该研究的重点是鉴定和表征两个废弃井HCE9B和HCE28B，当前套管状况，局限性和挑战，以进行切合实际，可测量，经济和技术上可行的油井干预和修井作业。这项研究的结果将适用于未来井的套管设计。