The work concerns the use of crude oil infrastructure in geothermal energy, focusing on the construction of boreholes created currently and in the future for crude oil and natural gas extraction purposes. Due to changes in energy policy almost all over the world, it is necessary to already introduce new rules in the design of boreholes for various purposes. This aims to re-use the wells after their purpose for the oil industry has been served. Such a possibility exists in the field of geothermal energy. There is an increasing tendency of adapting boreholes drilled for other purposes, e.g. exploration, for geothermal energy extraction. The structure of the boreholes designed and drilled, both currently and in the future, can be adjusted so that the well will perform more favourably working in the future as a geothermal well. One of the most important parameters of geothermal wells is their heating power. Many examples show that this power is influenced by the materials used in the well’s equipment. This applies to both the pipes and the properties of the sealing slurry. Cementation of boreholes is necessary for both oil wells and geothermal wells. It should also be implemented in many cases for sealing of borehole heat exchangers. The selection of appropriately modified cement slurry parameters increases the heating power, and thus enables the acquisition of a bigger amount of heat from the geothermal heat source. Heat losses are reduced during the transport of water from deep geothermal wells. Modification of slurry parameters should also be implemented for borehole heat exchangers, which previously served as oil wells - already at the stage of designing/creating such wells. The work discusses the issues of oil wells, both the old ones that can be used in geothermal energy and those that will be drilled. Moreover, changes in the design of new geothermal wells are argued and advocated.

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