Energy efficient utilization and mining device and method based on geothermal exploitation well

Abstract

The invention discloses an energy efficient utilization mining device and method based on a geothermal exploitation well. The device comprises a thermal production well, a recharge well, a closure face layer on the left side of the thermal protection well and a multistage user system connected between the thermal protection well and the recharge well. The thermal production well comprises an inner-layer casing pipe and an outer-layer casing pipe, a sealing layer A and a sealing layer B are arranged between the outer-layer casing pipe and the inner-layer casing pipe, the inner-layer casting pipe at the bottom of the sealing layer B forms a backflow cavity, the left side wall of the backflow cavity is provided with an inflow face, the pipe body, located in the backflow cavity, of the inner-layer casing pipe is provided with a hole layer casing pipe, a dual pressure pipe is longitudinally arranged between the inner-layer casing pipe and the outer-layer casing pipe, the recharge well comprises a recharge outer casing pipe and a recharge inner casing pipe, a layer backflow cavity is formed between the recharge well outer casing pipe and the recharge inner casing pipe, the top of the layer backflow cavity is provided with a sealing layer C, the bottom of the recharge well inner casing pipe is provided with a through hole bottom ring, and the left side wall of the recharge well casingpipe at the bottom of the sealing layer C is provided with a primary jet pipe. Geothermal well resources are effectively mined and utilized.

Description

technical field [0001] The invention relates to the field of geothermal well exploitation, in particular to an energy-efficient exploitation equipment and method based on geothermal development wells. Background technique [0002] Geothermal wells refer to methods and devices for generating electricity from geothermal energy with a depth of about 3,500 meters or hot spring water with a water temperature greater than 30°C. It belongs to high-temperature geothermal heat, 90 ℃ ~ 150 ℃, which exists in the form of a mixture of water and steam, etc., and belongs to medium-temperature geothermal; Low-temperature geothermal, in the existing geothermal resource utilization technology, the outlet water temperature of some commonly used geothermal wells can be as high as 95 ℃ or even higher, and when used for building heating, the water supply temperature of 45 ℃ can meet the requirements, usually The method is to exchange heat from 95°C geothermal water into 45°C heating water suppl...

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Problems solved by technology

[0007] (1) The entire set of existing facilities requires a relatively large investment. Opening a well in a deep geothermal well or an ultra-deep geothermal horizontal well requires more professional deep well equipment, which has a high degree of recovery and is easy to break during the mining process. Caving occurs, and after the mining of deep geothermal wells or ultra-deep geothermal horizontal wells, the investment and construction of recharge wells will occupy a larger part, and the equipment maintenance and cleaning of deep wells and ultra-deep wells are also difficult. Geothermal wells or ultra-deep geothermal horizontal wells have a large distribution of thermal layers, which cannot effectively use the heat of the upper layer of hot dry rock, wasting resources;

[0008] (2) The pure water produced by steam condensation using the waste heat of power generation needs to use the electricity in the power generation process, which affects the overall power generation effect, and at the same time, a large amount of hot wastewater after power generation cannot be used

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