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Geothermal Drilling: A Baseline Study of Nonproductive Time Related to Lost Circulation

机译：地热钻井：与遗传遗失的非培养时间基准研究

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A single production geothermal well costs up to $7 million and a typical geothermal field contains 10 to 20 wells for a development cost of potentially $140 million according to a Geothermal Resources Group study. Capital cost coupled with exploration and resource uncertainty lead to high upfront project risk. This study analyzed the time and cost of detailed geothermal drilling operations. We found that the largest cause of nonproductive time in geothermal wells is advancing through lost-circulation zones, where drilling fluid is lost from the well. Mitigation measures implemented during lost-circulation events can increase drilling time by a significant fraction of the drilling days. The opportunity exists to reduce the drilling costs by addressing logistical inefficiencies and ineffective mitigation measures to minimize nonproductive time. This study reviewed daily drilling data for 38 geothermal wells drilled since 2009 in the United States. Our analysis summarizes the lost-circulation events identified in the available drilling data by assessing time per event, costs incurred, materials used, success of mitigation strategies, and resolution time. This study found that wells averaged over 100 hours of unprogrammed nonproductive time due to lost circulation, adding rig costs of an estimated $185,000 or more to each well. We present a plan for future research aimed at reducing lost-circulation nonproductive time and cost.
机译：单一的生产地热井成本高达700万美元，典型的地热场含有10至20个井，其开发成本可根据地热资源集团研究进行潜在1.4亿美元。资本成本与勘探和资源不确定性相结合，导致高前期的项目风险。本研究分析了详细地热钻井作业的时间和成本。我们发现地热井中的最大原因是通过丢失循环区域推进，其中钻井液从井中丢失。在失去循环事件中实施的缓解措施可以通过钻井天的大部分增加钻井时间。有机会通过解决物流低效率和无效缓解措施来降低钻井成本，以最大限度地减少非生产时间。本研究审查了自2009年以来钻取的38家地热井的每日钻探数据。我们的分析总结了通过评估每次事件的时间，所产生的成本，使用的材料，缓解策略的成功和解决时间来概述可用的钻探数据中确定的丢失循环事件。本研究发现，由于流通失去了100小时的未编程的非培养时间，井平均井平均，增加了每个井的钻机成本为185,000美元以上。我们为未来的研究计划旨在减少丢失循环的非培养时间和成本。

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