Geothermal well based on complex geotechnical stratum

Abstract

The invention provides a geothermal well based on a complex geotechnical stratum. The geothermal well comprises a well cementing section and a filter well section, and wherein the well cementing section and the filter well section are arranged from top to bottom. The well cementing section comprises a well wall pipe of 15 meters long; and cement paste is recharged between the well wall pipe and a well bore. The filter well section comprises a permeable pipe of 30 meters long; a filter is arranged between the permeable pipe and the well bore; and the portion between the permeable pipe and the well bore is filled with pebbles with the diameters of 1-3 centimeters. According to the geothermal well based on the complex geotechnical stratum, silt in underground water can be blocked in the position between the permeable pipe and the well bore and is prevented from entering the geotechnical stratum, the quality of a water source in the geotechnical stratum is improved; and the portion between the permeable pipe and the well bore is filled with the pebbles with the diameters of 1-3 centimeters to further ensure the stability of the filter well section, and meanwhile, because the fillers have the same main components with the geology where the filter well section is located, flow of the underground water is not affected.

Description

technical field [0001] The invention relates to the technical field of geothermal wells, in particular to a geothermal well based on complex rock and earth formations. Background technique [0002] Geothermal energy is a kind of energy resource generated from nuclear fusion inside the earth. Geothermal energy is a kind of clean energy and renewable energy. It is widely used in heating and cooling, and its development prospect is very broad. [0003] The construction of geothermal wells is a key step in the utilization of geothermal resources. For different geology, the well structure of geothermal wells is also different. For geothermal wells in complex rock and soil strata, for example, the upper layer is silty clay and the lower layer is pebble layer. The components are sandstone, quartzite and chert, etc., and the components are mixed and filled, and the water is abundant. It is a good water-bearing formation, but the pebble layer is mixed with cohesive soil and fine san...

AI Technical Summary

Problems solved by technology

For geothermal wells in complex rock and soil strata, for example, the upper layer is silty clay and the lower layer is pebble layer. The components are sandstone, quartzite and chert, etc., and the components are mixed and filled, and the water is abundant. It is a good water-bearing formation, but the pebble layer is mixed with cohesive soil and fine sand, which increases the difficulty of filtering groundwater. Therefore, The filtration function of geothermal wells built on such complex rock-earth formations is particularly critical to prevent a large amount of clay and fine sand in the aquifer from entering the geothermal well, causing well blockage and affecting the normal use of the geothermal well

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