Extending the life cycle of geothermal wells: Effective strategies for scale removal

Abstract

Geothermal energy, a sustainable and renewable resource, plays a vital role in the global energy supply. To guarantee peak performance and longevity of geothermal wells, it is essential to implement a wellbore operation and maintenance strategy.
A fundamental component of this strategy is to address the formation of scale attributed to mineral precipitation from the brine during the reinjection and production process. The accumulation of the scale deposits significantly impacts the lifespan and efficiency of geothermal wells by restricting fluid flow, reducing wellbore performance and often leading to premature well failure.
Various methods for scale removal, including both conventional techniques, such as chemical and mechanical methods, and the more recent innovative technique of electrohydraulic pulsing, have been assessed to understand their advantages and challenges in achieving successful outcomes. All these techniques will be examined and compared by analyzing case studies from New Zealand and across the globe.
Determining the appropriate scale removal technique depends on specific wellbore conditions, operational requirements, regulatory constraints, and economic considerations. Furthermore, the integration of various treatment methods can optimize performance and operational costs.
Implementing a proactive strategy for regular wellbore cleaning will extend the operational life of geothermal wells, ultimately enhancing the economic viability of a geothermal project.