Current situation and future trend of geothermal energy development and utilization in China

The starting point and focus of "geothermal energy +" is to strengthen the complementary and comprehensive utilization of geothermal and other renewable energy sources on the basis of geothermal resource endowments and distribution characteristics, in accordance with local conditions, in order to achieve higher energy efficiency. Vigorously developing "geothermal energy +" is a development direction of new energy and renewable energy in the future.

Existing problem

At present, China pays little attention to the exploitation and utilization of geothermal resources, and insufficient exploration investment results in poor resource data base and lack of existing resource distribution data in China. Up to now, no unit has conducted a comprehensive and systematic exploration of China's geothermal resources, and it is impossible to evaluate the distribution of China's geothermal resources, which greatly affects the large-scale development of China's geothermal industry.

Problems in shallow geothermal development, such as well quality, pipe corrosion and scaling, as well as the cost and low efficiency of high-temperature geothermal Wells, still restrict the large-scale development of geothermal.

At present, the central and local governments have issued some financial and price encouragement policies, which have a positive guiding role in accelerating the development and utilization of shallow geothermal energy and promoting clean heating in northern China, but the policy is imperfect, the implementation is not in place, and is not sufficient. The price preference is insufficient, and the targeted and mandatory policies for geothermal development and utilization are not strong, which requires effective guidance and incentive policy support from the government.

Relevant suggestion

Research and development of key technologies and complete sets of equipment for geothermal power generation will be carried out

Carry out technical and economic feasibility studies on medium and low temperature power generation. Opportunities and challenges with respect to the technical and economic feasibility of developing geothermal resources for power generation at temperatures of 150 ° C and below; Develop a new type of working medium and low temperature geothermal power generation heat exchange fluid with low cost and high efficiency that can rapidly expand/compress. Tackle key technologies and complete sets of equipment for geothermal power generation from dry hot rock; The integration of geothermal power generation and other renewable energy development technologies will lay technical reserves for the large-scale development of geothermal power generation in the future.

Research on key technologies for efficient development of hot and dry rock was carried out

Due to the high strength and high temperature characteristics of dry hot rock, efficient and safe well formation has become the technical bottleneck of efficient development of dry hot rock, which needs to be tackled urgently. On the basis of studying the geological characteristics and resource endowment of hot and dry rock, combined with the technical characteristics of hot and dry rock development, the drilling problems of deep, high temperature, hard and unstable strata are solved.

The research on the single well pumping and recharge system was carried out

In view of the measures to enhance the heat recovery capacity of single well and the design of new single well structure, the research work to improve the heat transfer efficiency under multiple measures is carried out, such as production and injection in the same well, increasing the heat transfer area in branch Wells, heat transfer in large holes, stimulating downhole turbulent flow and strengthening convective heat transfer.

Research on geothermal drilling engineering technology to reduce cost and improve drilling efficiency was carried out

Research on pneumatic and hydraulic hammer drilling technology in hard rock of geothermal deep Wells, including the adaptation and matching of drill, drill and impactor with rock; Parameters such as air volume, air pressure, drilling fluid pump volume, bit weight, drilling rate, groundwater yield, etc.