Geothermal utilization system, control device, control method, and program

This geothermal energy utilization system is provided with: a pumping well; water injection wells; the piping extends from the pumping well to the water injection well; a heat exchanger provided to the piping; the pressure sensor is used for detecting the pressure in the water injection well; an on-off valve capable of opening and closing the water injection well with respect to the atmosphere; and a control device that performs control so as to open the on-off valve when the detected pressure is greater than the reference pressure. 本公开的地热利用系统具备：抽水井；注水井；配管，从抽水井延伸至注水井；热交换器，设于配管；压力传感器，对注水井内的压力进行检测；开闭阀，能相对于大气开闭注水井；和控制装置，在检测到的压力大于基准压力的情况下，以打开开闭阀的方式进行控制。