Utah FORGE: Reports on Northwestern Nevada Well Doublet Drilling and Testing by Fervo Energy

These reports review Fervo Energy's construction of a commercial enhanced geothermal system (EGS). Fervo has qualified full functionality of the system through production testing at commercially relevant operating conditions. The project site is located in a nearfield setting adjacent to an operating geothermal power station in north-central Nevada and is designed to deliver an uplift in high-temperature geothermal flow rates to increase the power capacity at the facility. The project involved drilling a first-of-a-kind EGS horizontal doublet well system consisting of an injection and production well pair within a high-temperature hard-rock geothermal formation. The lithology of the target reservoir is characterized as a mixed metasedimentary and igneous formation, comprised of phyllite, quartzite, diorite, and granodiorite, representative of the geology across the most prospective geothermal areas throughout the western US. This work included a 16-stage plug-and-perforate stimulation treatment which was the first of its kind in a high-temperature mixed metasedimentary and granitic formation in a fully horizontal doublet geothermal well.本批报告详述了Fervo能源公司（Fervo Energy）商用增强型地热系统（Enhanced Geothermal System，EGS）的建设历程。Fervo能源已通过符合商业运营标准的生产测试，验证了该系统的全功能可用性。该项目场址位于内华达州中北部一处紧邻运营中地热电站的近场区，旨在通过提升高温地热流体流量，提高该电站的发电容量。本项目钻取了全球首例应用于高温硬岩地热地层的水平双井系统，该系统由一组注入井与生产井组成。目标储层的岩性为变沉积岩与火成岩混合地层，由千枚岩、石英岩、闪长岩及花岗闪长岩构成，该地质特征代表了美国西部绝大多数极具开发潜力的地热区域的典型地质条件。本次作业包含16级桥塞射孔压裂改造工艺，这是全球首次在全水平双井地热井的高温变沉积岩与花岗质混合地层中采用此类工艺。