Some Results Being Use to Stable Control of an Artificial Geothermal Crack in a Hot Dry Rock

Abstract

An abundant amount of geothermal energy could be recovered from rocks· by c irculating fluid through geothermal cracks which created by a hydraulic technique. In the development of geothermal extraction system of this type, the and experimental studies of for fluid-filled geothermal cracks have been made on of the fracture approach. A comprehensive survey can be found in literature During the extraction of heat, the surfaces of the geothermal cracks are cooled by circulating fluid and the thermal contraction of the rocks occurs. Therefore, it is necessary for controlling the geothermal cracks to make the fracture mechanics study of them including thermoelastic effectspX31 In this paper, discussion is focused on the behavior of an artificial geothermal crack during extraction of heat, which is use to stable control of geothermal cracks. The ahalysis is based on the theory of quasi-static thermoelasticity. Firstly, we concerned with the effect of the initial rock temperature gradient on the fluid temperature at the outlet and the behavior of the geothermal crack. Next, the effect of the change of supply flow rate is considered. Finally, the time limit for the stable geothermal crack is discussed.