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 well

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