Hot dry rock is a widely distributed and abundant geothermal resource. Its development and utilization are of great significance for reducing fossil energy consumption, alleviating environmental pollution and ensuring energy security. The enhanced geothermal system is the main way to develop dry hot rock at present, which is generally implemented through several links such as project site selection, geothermal drilling, thermal storage construction, flow test and commissioning power generation. Among them, the cycle test is an important link to undertake the construction of thermal storage and power generation engineering, which is used to form injection-production well groups, evaluate the cycle circuit, expand the heat exchange capacity, and lay the foundation for the final safe and stable realization of power generation objectives. The implementation process of the flow test is characterized by long-term and complexity, which is easy to cause problems such as insufficient connectivity, strong microseism, liquid leakage, scaling of the circulating fluid, and insufficient equipment reliability. Therefore, the flow test construction of dry-hot rock development sites in the world is often interspersed with drilling and reservoir reconstruction, and accompanied by scheme adjustment, to gradually achieve the goal of power generation. This paper briefly summarizes the flow test experience of developing EGS system for typical dry hot rock at home and abroad, expounds the influence of various factors on flow test, and puts forward development suggestions based on the actual situation of the site in Qinghai Republic, providing reference for technical personnel engaged in relevant fields.
DownLoad: