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

A technology of high-pressure pulse and hydraulic fracturing, which is applied to heat storage equipment, earthwork drilling, indirect heat exchangers, etc., can solve the problems of small artificial heat storage range, expand the range of heat exchange, shorten the operation time, and apply strong effect

Active Publication Date: 2021-04-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1

[0042] The heat storage method of hot dry rock high-pressure pulse composite hydraulic fracturing provided in this embodiment is characterized in that it includes the following steps;

[0043] S1. Determine the depth and range of the hot dry rock reservoir 1 and determine the well group layout plan according to the depth and range of the hot dry rock reservoir 1. Depth and extent of hot rock reservoirs1.

[0044] S2. Construction is carried out on the water injection well 2 and the water production well 3. When the water injection well 2 and the water production well 3 reach the hot dry rock reservoir 1, the drilling is stopped.

[0045] In the process of practical application, the distance between the water injection well 2 and the water production well 3 is 100-1000m.

[0046] S3. Place the high-voltage pulse device 6 on the ground surface, and place the two sets of electrode assemblies 5 electrically connected to the high-voltage pulse device 6 in the water injection well ...

Embodiment 2

[0059] This embodiment provides the hot dry rock high-pressure pulse composite hydraulic fracturing artificial heat storage system used in the first implementation. The system includes a high-voltage pulse device 6 , two sets of electrode assemblies 5 and two sets of adjustment brackets 7 . Among them, the high-voltage pulse device 6 is placed on the ground surface, two sets of electrode assemblies 5 are electrically connected with the high-voltage pulse device 6, two sets of adjustment brackets 7 are respectively aligned with the wellheads of the pre-constructed water injection well 2 and water production well 3, and the two sets of adjustment brackets 7 are respectively connected with two groups of electrode assemblies 5, which are lowered into the water injection well 2 and the water production well 3 respectively.

[0060] In this embodiment, the adjustment assembly includes an adjustment bracket 7 , a moving slider 11 and a pulley 12 . Adjusting support 7 comprises vertic...

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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 ...

Claims

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Application Information

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IPC IPC(8): F28D20/00E21B43/26
CPCF28D20/0056E21B43/26Y02E60/14
Inventor 刘造保李博岩严孝海邵建富沈挽青
Owner NORTHEASTERN UNIV
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