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The global energy sector from a subsurface perspective

Geothermal

Understanding geothermal energy

Elliot Yearsley
The energy contained in a geothermal fluid is defined by its enthalpy, generally given in kilojoules per kilogram (kJ/kg). For a liquid, the enthalpy is primarily determined by its temperature.…

A geothermal blowout in Japan

Henk Kombrink
He often tweets about mud volcanoes, but today Mark Tingay retweeted a message from a Japanese user of Twitter who filmed a violent eruption of steam – possibly mixed with…

The basics of submersible pumps in geothermal projects

Elliot Yearsley
Pumped-well geothermal projects utilize “binary” power plant technology which consists of Organic Rankine Cycle (ORC) heat exchangers. The geothermal fluid is pumped from the wells as a single phase liquid…

Coring the seal of a geothermal reservoir

Henk Kombrink
In the little village of Monster, which ironically translates to “sample” in Dutch, operator HVC recently completed a new geothermal well. The well targeted the Lower Cretaceous Delft Sandstone, from…

A potential depth record?

Henk Kombrink
The website ThinkGeoenergy reported in February that preparations were ongoing for drilling a geothermal well in the south of Poland, with a potential terminal depth of 7 km. Reaching this…

Pumped geothermal power projects – a global overview

Elliot Yearsley
Pumped-well geothermal projects utilise the moderate temperature range of geothermal fluids between 100-190 C. Below this temperature, geothermal fluids are generally used for direct heating and above this the fluids…