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Survey on Effective and Feasible Emerging Technologies for EGS Well Drilling

机译：EGS钻井技术有效和可行新兴技术调查

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Geothermal well drilling differs from oilwell drilling in some points, although both use the same rotary drilling methods. The primary point in drilling geothermal wells may be the formation temperature; this temperature is higher in geothermal wells than typical oil wells even at the same depths. In addition to the extremely high-temperature environment, two other critical issues are the frequent occurrence of severe lost circulation in naturally fractured or fault zones and very low penetration rate because of volcanic or granitic hard and abrasive formations. The increase in drilling costs because of these problems peculiar to geothermal well drilling will be a barrier, particular, for the development of enhanced geothermal systems (EGSs) as a promising renewable energy option for future. To reduce the drilling costs in EGS well drilling, we surveyed the applicability of emerging technologies being developed in the oilwell drilling industry. In this study, we evaluate the effectiveness and feasibility of these emerging drilling technologies for EGS development and discuss future tasks.
机译：地热井从在某些点油井钻探钻孔的不同，虽然两者使用相同的旋转钻井方法。在钻地热井可以是地层温度的主点;该温度在热井比典型的油井即使在相同的深度更高。除了极高温环境，另外两个关键的问题是，因为火山或花岗岩坚硬，研磨性地层的天然裂缝或断层地带和非常低的渗透率严重漏失的频繁发生。在钻井，因为这些问题的成本增加特有的地热井钻探将是一个障碍，尤其是，增强型地热系统（EGSS）作为今后一个有前途的可再生能源选择的发展。为了减少EGS钻井的钻井成本，我们调查了油井钻探行业正在开发新兴技术的适用性。在这项研究中，我们评估这些新兴的钻井技术EGS发展的有效性和可行性，并讨论今后的任务。

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