Study of geothermal energy from middle-to-deep layers aims at development of a certain renewable clean energy to reduce dependence of fossil fuels and carbon discharge.It is an important measure for green and low-carbon transition of the energy industry.Focusing on the bottlenecks in geothermal development of the middle-to-deep layers in the Jizhong zone,such as geological identification,development plans and surface engineering,this article makes study of the key underground and surface technologies,which leads to the following results.(1)The thermal reservoirs of the middle-to-deep layers in the Jizhong zone are mainly layered sandstone and block buried hill.The bottleneck for sandstone geothermal development is the difficulty to identify the sandstone layer with a relatively poor re-injection ability.The bottleneck for buried hill geothermal development is the strong heterogeneity of the thermal reservoir requiring high drilling success rate and high designing precision of the development plan.(2)Prediction of the favorable thermal reservoir and sweet spot identification technology are able to effectively identify the sweet spot of a thermal reservoir.Combination of optimized development parameters with dynamic analysis while drilling+production-injection experiment+five sensitivity experiment brings about high-efficiency sandstone geothermal development.(3)Combined application of geophysical data,drilling log and testing data can precisely identify the position of the buried hill thermal reservoir.The high-efficiency gravity flow buried hill development technology leads to high production based on a few wells and full pressure-free re-injection in the same layer.(4)The technology of using geothermal high temperature differential pump for warming,anti-sewage and anti-scaling improves the geothermal heat-exchanging rate and reduces the operational and maintenance cost.(5)Using geothermal energy for warming,refrigeration and steam generation according to applications based on the different scenarios further expands the range of geothermal utilization and improves the utilization rate of geothermal resources,thus bringing the resource energy into full play.
关键词
中深层地热/层状砂岩/潜山地热/资源评价/大温差热泵
Key words
geothermal energy of middle-to-deep layers/layered sandstone/buried hill geothermal energy/estimation of resource/high temperature differential heat pump
维普
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