Geothermal well control methods, equipment, and modeling technologies: A review

Document Type

Article

Publication Date

8-1-2026

Abstract

As interest in geothermal energy continues to grow, drilling operations in high-temperature formations have become more widespread. Despite this trend, specialized techniques for well control during geothermal drilling, such as managing steam kicks and advanced modeling of subsurface processes, are still developing areas. In contrast to oil and gas operations, geothermal well control faces distinctive challenges due to harsh conditions like high-temperature steam and fractured, abrasive formations. This study offers a detailed review of available well control strategies and the associated equipment used throughout geothermal drilling operations, along with an overview of the modeling approaches supporting these technologies.In both geothermal and petroleum fields, drilling is a high-risk activity where equipment and people may be exposed to risk by kicks and blowouts. Because of these hazards, drilling crews must remain ready to take the appropriate well control measures as soon as possible. Such processes are highly structured and well-practiced in the oil and gas sector, but geothermal operations frequently lack this level of maturity. Although the fundamentals of drilling are similar, geothermal projects have unique problems that call for different control methods, such as high formation temperatures, steam-driven flow behavior, and erratic pressure conditions. Therefore, without the necessary modifications made for geothermal environments, using traditional oil and gas well control techniques directly on geothermal wells may not be effective.This paper summarizes the distinctive aspects of the geothermal drilling environment and associated hazards, highlighting the need for tailored well-controlled methods. It provides an overview of currently practiced geothermal well control techniques, including the cold-water injection well killing, capping and reentering, and relief wells. Additionally, it examines the state-of-the-art modeling techniques employed for geothermal well control, encompassing the modeling of transient heat transfer, steam-water two-phase flow, and phase change behaviors, essential for safe and efficient geothermal operations.By exploring the existing literature on geothermal well control and modeling technologies, this review aims to consolidate the knowledge in this field, identify knowledge gaps, and suggest potential avenues for future research. The findings of this study contribute to the advancement of well control practices in geothermal drilling, ultimately helping to improve the safety and efficiency of geothermal operations.

Publication Source (Journal or Book title)

Geoenergy Science and Engineering

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