Analýza možností realizace geotermálních vrtů ve velmi tvrdých horninách

Abstract

With the increasing demand for energy, people began to search and develop new alternative sources of energy. One of these sources is geothermal energy. Although drilling wells for geothermal energy is quite similar to drilling for oil and natural gas, there are some aspects of it that are unique. The main problems associated with geothermal drilling are mainly related to the hardness of the igneous and metamorphic rocks being drilled and the high temperature of the formation There are also other specific problems when drilling geothermal wells, including complete loss of circulating fluid (mud), low drilling speed in hard rock, frequent damage or very rapid wear of the drilling tools used, failure due to high temperatures, especially of directional drilling equipment and possible hydraulic motors used in drilling, breakdown of the structure of the drilling fluid at high temperatures, high torque of the drill string, loss of cement slurry during cementation. By gradually acquiring knowledge about issues from the implementation of geothermal wells, and this experience is gradually reflected in the implementation and preparation of other geothermal projects. The most important is the analysis of the resulting problems that occurred during the drilling process.