SPECIFICITY OF GEOTHERMAL DRILLINGBASED ON OIL AND GAS EXPLORATION COMPANY JASŁO ACTIVITIES

Geothermal Energy is very often an area of interest to local communities and beyond (Poland, EU). The reason for it is the cleanness of such energy and its good accessibility. Therefore, it is possible to receive the energy source in certain area and make the area partly independent from conventional energy providers. The limiting factor is the high cost of making the underground heat available. Drilling of geothermal wells is most often the most expensive part of geothermal projects. The paper presents technical and technological aspects of drilling geothermal wells, based on Polish and Slovak experience. The construction of chosen vertical and directional geothermal wells in various geological and reservoir conditions is presented in the paper. Applied bits, drilling mud and drilling technique with a downhole motor, are discussed. Special attention was paid to the difference between geothermal drilling and oil and gas drilling. The drilling progress results, which are an important factor influencing the geothermal installation cost reduction, close the paper.