Geothermal geophysical survey of hot spring well drilling

Geothermal geophysical survey of hot spring well drilling

Geothermal exploration work follows scientific principles, and the basic workflow includes: basic geological data research, field geothermal geological survey, geochemical survey, geophysical survey, special hydrogeological survey, geothermal drilling, etc. The well completion process refers to the general term for drilling, slurry replacement, installation of well casing, gravel filling, sealing, well washing, pumping test, water sample collection and other processes. Well washing is a key process that connects the past and the future in the well completion process. There are two types of filter completion methods for geothermal wells: naked eye and filter pipe. In order to obtain geothermal water to the fullest extent possible, geothermal hot spring wells generally undergo simple or complex well washing processes and use various well washing methods. In special ball situations, a well washing method is repeatedly used to ensure that the water volume and temperature of the geothermal well meet the requirements of the design or contract indicators, while also striving to achieve the required water volume and temperature. The quality of the project is qualified, and finally, after pumping tests and water sample analysis, it passes the water volume and water quality inspection. After the completion process of geothermal wells, continuous jet cleaning should be carried out, and the mud should be diluted and replaced with clean water using a mud pump. Due to various reasons, some geothermal wells have been idle for a long time without timely slurry replacement, which poses significant difficulties for subsequent well cleaning work.

Geothermal geophysical survey of hot spring well drilling

There are more and more hot spring wells, not only because ordinary people need to utilize this resource, but also because of the advancement of development technology. The development of hot spring wells has introduced many international technologies, which can meet the needs of various geothermal energy use modes. Hot spring wells used for geothermal agriculture planting and breeding are different from those used for geothermal heating. In different places, due to the different distribution of soil and rocks, the drilling technology used in hot spring wells is also different. The continuous introduction of drilling technology has further expanded the application market of hot spring wells and met various development needs. During the slurry replacement process, a side jet flushing device should be used to spray the wellbore wall and disturb the mud skin adhered to the borehole wall during drilling. The number of sprays should be increased in the main aquifer section. Generally, slurry replacement and jet cleaning are carried out from bottom to top. After the jet cleaning of the water intake well section is completed, the side jet flushing device is lowered to the bottom of the well to continue slurry replacement with clean water until the return fluid at the wellhead is relatively clear and basically free of mud and sand. In geothermal development, hot spring well engineering is the highlight, and many investors have invested in the development of hot spring wells, often costing tens of millions or billions of yuan. Local governments also encourage the development of hot spring well projects, which is the foundation for various utilization modes of geothermal energy. Geophysical exploration provides the result of interpreting and inferring geological bodies or structures based on physical phenomena, and it is an indirect exploration method. The study or exploration of geological bodies or structures using geophysical methods involves solving the problem of field source bodies based on measurement data or observed geophysical fields. It is a problem of inversion of geophysical fields, and the inversion results are generally multiple solutions. Geophysical exploration has the problem of multiple solutions. In order to obtain more accurate and effective interpretation results, various geophysical methods are generally used in combination for comparative research. At the same time, attention should be paid to combining geological surveys and geological theory research for comprehensive analysis and judgment.