What are Geothermal Wells?

Geothermal wells refer to methods and devices for generating electricity by geothermal energy with a well depth of about 3,500 meters or hot spring water with a water temperature greater than 30 ° C. There are three types of geothermal heat, medium temperature and low temperature. Above 150 , in the form of steam, belongs to high-temperature geothermal; 90 150 , in the form of mixture of water and steam, etc., belongs to medium-temperature geothermal; above 25 , below 90 , with warm water, warm Hot water, hot water and other forms are low-temperature geothermal. On March 12, 2010, a geothermal well was successfully drilled in Fengheying Village, Daxing District, Beijing. After measuring the temperature to 103 ° C, it broke the record of geothermal water temperature in Beijing and became the first medium-temperature geothermal well in Beijing.

Geothermal wells are about 3500 meters deep

1. Most people first think of hot spring bathing, geothermal is far more than these simple uses. Geothermal is divided into high temperature, medium temperature and low temperature. Above 150 , in the form of steam, belongs to high-temperature geothermal; 90 150 , in the form of mixture of water and steam, etc., belongs to medium-temperature geothermal; above 25 , below 90 , with warm water, warm Hot water, hot water and other forms are low-temperature geothermal.

2.High temperature geothermal suitable

There are three main types of wellhead devices for geothermal wells: multifunctional wellhead devices, wellhead oxygen isolation devices, and wellhead sand removal devices. ^[1]

To talk about geothermal wells, you must first understand what geothermal is.

Geothermal resources have a wide range of uses. The difference between them and fossil fuels is that they do not need to be burned, because they have low transportability and high temperature.

1. Some local geothermal wells in China have experienced an average annual water level drop of about 10m or more. Predatory destructive mining makes long-term use difficult

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9 Geothermal well Xingre 9

On March 12, 2010, cheers arose at an exploration site in Fengheying Village, Daxing District. It turned out that the construction staff successfully drilled a geothermal well, and the geothermal water emerging from the wellhead measured the temperature to 103 ° C, breaking the record of geothermal water temperature in Beijing and becoming the first medium-temperature geothermal well in Beijing. Ye Hongyu, deputy general manager of Peili Engineering Co., Ltd. responsible for the construction of the well, said that the geothermal well numbered as "Xingre-9 #", the well depth reached 3623 meters, the sunrise water volume exceeded 1,500 cubic meters, and the daily artesian water volume was nearly 800 cubic Meter. This is a rare artesian geothermal well in Beijing. Geothermal water spurts out of the ground and can reach a height of 52 meters. The cost of geothermal extraction is relatively large. It takes several kilometers to find the geothermal heat that can be used. The cost of each geothermal well is at least tens of millions of yuan. Since the early 1970s, Beijing has developed Liangxiang and Tianzhu Thermal Fields. So far, 10 geothermal fields have been found to be suitable for development and utilization.

According to the previous feasibility demonstration results, the geothermal resources in the high-temperature core area of the Fenghe camp thermal field can meet the heating needs of more than 5.5 million square meters of buildings in the local area. Compared with the heating of large coal-fired boilers, the annual cost savings can be more than 60 million yuan. Reduce coal consumption by 85,000 tons, reduce dust volume by 20 tons, and reduce waste residue by 10,000 tons.

Geothermal well geothermal resources

Data show that geothermal resources are valued by countries around the world. International energy experts generally believe that by 2100, geothermal utilization will account for 30% to 80% of the world's total energy value. Europe and the United States and other countries have listed geothermal as a priority to develop and use alternative energy sources. 85% of Iceland's residential buildings use geothermal heating. The United States has the largest geothermal installed capacity and geothermal power generation in the world. For China, the most urgent thing is to use geothermal as an alternative energy source. In the past, people thought that the temperature below 25 was not called hot spring and had no use value. It has been found that groundwater in Beijing's shallow 5 ° C to 6 ° C can be used through heat pump technology.

Compared with coal, petroleum and other energy sources, geothermal is not only clean, but also can be reused, which is a renewable resource. Deep groundwater has its own circulation system. After part of the hot water is pumped up, it will be continuously recharged from a distance. In this sense, geothermal resources are inexhaustible and inexhaustible. However, due to the severe overheating of geothermal heat in recent years, geological subsidence has been caused in some areas. Zheng Kezhen emphasized that while geothermal water is being used, it must be recharged. The used hot water is reinjected back into the aquifer after treatment, which can improve the regeneration performance, so that the aquifer will not dry up. This method is widely used internationally, for example, Paris uses a large amount of geothermal heating, but the water level has not dropped due to 100% recharge. In recent years, some cities with large geothermal utilization scales in China have formulated recharge rate standards. Tianjin requires new geothermal projects to achieve 100% recharge, and Beijing has made the same regulations. The local must first make its own development plan, whether it is to develop tourism or real estate development, or focus on the development of agriculture and aquaculture, and then develop a plan for the use of geothermal resources according to the development plan. ^[1]