Join us for webinar on the 14th of February on studies done on chemical stimulation to increase injectivity of sedimentary geothermal reservoirs.
As part of the regular Focus on Geothermal Webinar series – a partnership of Enerchange and ThinkGeoEnergy, we are proud to host Dr Maren Brehme of ETH Zürich. This week’s webinar will be on “Challenges and opportunities of sedimentary geothermal reservoirs.” workover and completion fluids
Registration: Click here to register
Speaker: Dr Maren Brehme, Senior Research Assistant, Geothermal Energy and Geofluids, ETH Zürich, Switzerland
Low injectivity is often experienced in geothermal doublets installed in sandstone reservoirs. This even led to a shutdown of the Mezoberény (Hungary) geothermal site. An on-site campaign was carried out at that site including a stimulation aiming to enhance the transmissivity of the sedimentary reservoir and the near-wellbore zone of this site.
Previous studies have concluded that insufficient injectivity may be linked to a high skin effect in the near well-bore zone and pore-clogging in combination with the low net sandstone content of the fluvio-deltaic reservoir. At other sites, chemical or biological activities are the reason for decreasing permeability during the operation of the geothermal plants. In Mezoberény a chemical soft stimulation based on the injection of hydrochloric acid (HCl) was successfully used to unclog and recover the well injectivity. Hence, it is possible to retrieve favorable conditions and operate sustainably.
With a focus on Mezoberény, several examples will be shown on the challenges and opportunities of using sedimentary reservoirs for geothermal energy production.
Dr Maren Brehme is a hydrogeologist aiming to understand subsurface fluid flow using multidisciplinary approaches for sustainable geothermal exploration and exploitation strategies with a strong focus on fieldwork and real-scale data. Maren’s main research objective is finding new well locations during geothermal exploration and field development and on optimizing sustainable geothermal energy extraction and conversion.
corrosion inhibitors for oil drilling Areas of expertise are geothermal reservoir characterization, hydraulic, thermal and chemical data interpretation, enhancing reservoir performance and its sustainable use. Methods and findings are mainly related to geothermal systems but applicable in any geofluids environment (geothermal, CO2, H2, heat, drinking water).