For decades, geothermal drilling professionals have operated in a unique space between traditional mining and oil & gas. While geothermal projects share many drilling techniques with the oilfield, the challenges encountered in geothermal wells are fundamentally different.
High temperatures. Steam. Corrosive brines. Lost circulation. Thermal cycling. Two-phase flow.
Yet until now, much of the industry's well control philosophy has been adapted from standards originally developed for oil and gas operations.
That has finally changed.
In May 2026, the International Association of Drilling Contractors (IADC) released its new Geothermal Well Control Guidelines, a landmark document specifically developed for geothermal drilling and well servicing operations. This publication represents years of collaboration between some of the most experienced geothermal operators, drilling contractors, service companies, equipment manufacturers, consultants, and training providers in the world.
Read the Guidelines HERE
Why This Matters
The geothermal industry has grown rapidly in recent years as countries seek reliable, renewable baseload power generation. However, geothermal wells present hazards that differ significantly from conventional oil and gas wells.
The guidelines recognize that geothermal well control is not simply about managing pressure. In geothermal environments, operators must manage both pressure and temperature simultaneously. High temperatures can compromise equipment, affect barrier integrity, and trigger steam flashing events that create unique well control challenges.
The document specifically highlights hazards such as:
- Aquathermal events
- Steam flashing
- Thermal shock
- Lost circulation
- Corrosive geothermal fluids
- High-temperature equipment degradation
- Two-phase and multi-phase flow conditions
These are risks that geothermal professionals have dealt with for years but often without dedicated industry-wide guidance.
A Major Step Forward for Industry Standardisation
One of the most important aspects of the new guidelines is the introduction of a structured geothermal well classification system.
Rather than treating every geothermal well the same, wells are categorized according to complexity, temperature, pressure regime, geology, and operational risk. The classifications range from simple low-temperature wells through to extreme-complexity frontier geothermal projects involving supercritical resources and high-pressure, high-temperature environments.
This creates a common language for operators, drilling contractors, regulators, training providers, and service companies worldwide.
Recognising That Geothermal Is Different
Perhaps the most important message in the guidelines is a simple one:
Geothermal is not oil and gas.
The document clearly states that geothermal operations differ fundamentally from conventional oilfield operations. Geothermal drilling targets heat rather than hydrocarbons and routinely encounters temperatures exceeding 300°C, highly fractured formations, corrosive fluids, and unique flow characteristics.
For years, many geothermal professionals have argued that the industry required its own standards and training framework. The release of these guidelines demonstrates that geothermal has matured into an industry with its own operational identity.
Better Safety, Better Training, Better Equipment
The guidelines place a strong emphasis on:
- Risk management
- Well barrier philosophy
- Geothermal-specific well control training
- Temperature management
- Equipment suitability
- Blowout prevention equipment for geothermal service
- Managed pressure drilling (MPD)
- Cooling systems
- Emergency response planning
This is expected to drive improvements in training standards, equipment selection, project planning, and operational consistency across the industry.
What This Means for Suppliers and Contractors
For drilling contractors, service companies, and equipment suppliers, these guidelines are likely to influence future project specifications around the world.
Expect increased focus on:
- High-temperature-rated equipment
- Geothermal-specific BOP configurations
- Thermal derating requirements
- Corrosion-resistant materials
- Advanced well control training
- Improved inspection and certification programs
Companies that already specialize in geothermal operations may find themselves well positioned as owners and regulators increasingly reference these guidelines during project planning and procurement.
A Milestone for the Future of Geothermal Energy
The geothermal sector has spent years adapting practices from other industries while building its own knowledge base.
The publication of the IADC Geothermal Well Control Guidelines is more than just another technical document. It is recognition that geothermal has become a mature global industry deserving of its own standards, best practices, and safety philosophy.
For an industry poised for significant growth over the coming decades, this release represents a major milestone—and one that many geothermal professionals have been waiting for for a very long time.
Safety Shark
Supporting the geothermal, drilling, mining, and energy industries with quality equipment, safety products, and practical solutions for challenging environments.