High-voltage pulse compound hydraulic fracturing thermal storage method for hot-dry rock

Abstract

The invention belongs to the technical field of construction of man-made thermal reservoirs for hot-dry rock, and particularly relates to a high-voltage pulse compound hydraulic fracturing thermal storage method for the hot-dry rock. The thermal storage method comprises the steps that the depth and range of the thermal reservoir for the hot-dry rock need to be determined, a well group arrangement plan is determined according to the depth and range of the thermal reservoir for the hot-dry rock, and a water injection well and a water sampling well are constructed; a high-voltage pulse device is placed on the ground surface, two electrode assemblies electrically connected with the high-voltage pulse device are placed in the water injection well and the water sampling well respectively, the high-voltage pulse device is started, and hydraulic fracturing is oppositely conducted between the water injection well and the water sampling well after the electrode assemblies discharge electricity to the thermal reservoir for the hot-dry rock many times. Operation is stopped after water gets through; room-temperature water is injected into the water injection well to the thermal reservoir for the hot-dry rock; and the room-temperature water flows through the hot-dry rock for heat exchange. Therefore, the method overcomes the defect that the range of a man-made thermal reservoir in a single hydraulic fracturing technology is narrow; the production cost is reduced; and the economic benefit is increased.

Description

technical field [0001] The invention belongs to the technical field of hot dry rock artificial heat storage construction, and in particular relates to a hot dry rock high pressure pulse composite hydraulic fracturing heat storage method. Background technique [0002] Hot dry rock is a kind of clean energy. my country has rich reserves of hot dry rock resources and has great potential for development. Hot dry rock is a high-temperature rock mass with poor permeability and extremely low water content. Through artificial fracturing, water injection wells are injected into the cracks of hot dry rock with cold water. The cold water absorbs the heat in dry hot rock and converts it into hot water from the The water well is pumped out, so as to achieve the purpose of extracting its heat for power generation or heating. [0003] At present, the most commonly used artificial fracturing method is hydraulic fracturing technology, but hydraulic fracturing technology relies on hydraulic ...

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, the present invention provides a hot dry rock high-pressure pulse composite hydraulic fracturing heat storage method, which overcomes the defect of a single hydraulic fracturing technology with a small range of artificial heat storage, and reduces production capacity. cost, expand economic benefits, and meet business development needs

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