A shale gas extraction system heated by solar energy

Abstract

The invention provides a solar-heated shale gas mining system. The system includes a steam generator, an inner tube, and a sleeve. The inner tube is arranged in the sleeve in a sleeving mode, and thesleeve is arranged in a shale gas storage layer; and the steam generated by the steam generator enters the sleeve through the inner tube, and the wall surface of the sleeve is provided with cracking holes. The steam generator is a solar steam generator and includes a solar collector and a heat exchanger; and the heat exchanger is connected with the solar collector, and water is input to the heat exchanger from a feeding water tank and enters the inner tube after the water is heated into steam in the heat exchanger. The solar-heated shale gas mining system fully utilizes solar energy to generate steam by heating, the solar energy is applied to the exploitation of shale gas, energy is saved, water resources are saved at the same time, and the development cost of shale gas in the water-shortage region is greatly reduced.

Description

technical field [0001] The invention relates to a solar thermal utilization technology, in particular to a shale gas exploitation technology utilizing solar energy. Background technique [0002] Shale is a kind of sedimentary rock with complex composition, mainly composed of clay deposits formed by pressure and temperature. Shale gas is a gas mainly composed of methane stored in the nanopores of shale. Shale gas is mostly stored in shale in a free state and an adsorbed state, and there are significant differences in the proportions of these two forms of shale gas under different geological conditions. The larger the pore size of shale, the more free shale gas can be stored, and the higher the organic matter content of shale, the more adsorbed shale gas can be stored. Most of the existing shale gas is stored at a depth of 1-2 kilometers underground (the pressure is about 10-20MPa, and the temperature is about 338-378K). [0003] Shale gas is mainly composed of methane and ...

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Problems solved by technology

However, most of China's shale gas deposits are distributed in Xinjiang, Inner Mongolia, Sichuan and other water-scarce areas, so it is not realistic to use hydraulic drilling technology on a large scale

In addition, hydraulic drilling technology also has potential safety hazards of polluting groundwater and soil resources

[0006] In the prior art, for example, CN106884637A discloses a method for exploiting shale gas using heat pipes, which uses heat pipes to transfer heat from hot dry rock formations to shale gas reservoirs for heating, thereby promoting the exploitation of shale gas. The heat absorption capacity of the heat pipe in the method is insufficient, and in this case only a single gravity heat pipe is arranged up and down, resulting in insufficient heat absorption surface of the heat pipe, and the heat absorption capacity is limited

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