Multi-well combined artificial heat storage construction system based on hot dry rock and construction method

Abstract

The invention discloses a multi-well combined artificial heat storage construction system based on hot dry rock and a construction method. A new idea for artificial heat storage construction based onhot dry rock is provided, a well group effect on multi-well combined reservoir construction can be realized with a multi-well combined construction method as a core through integration of hydraulic fracturing, chemical stimulation and other means, communication distance between an injection well and a mining well in dry hot rock development is effectively increased, effective volume and heat exchange area of artificial heat storage are increased, long-term and low-pump-volume shear fracturing and chemical stimulation on multiple wells are continued, pumping pressure and scale are small, stressrelease process is slow, and earthquake risk can be effectively reduced; with adoption of the method, large-scale effective artificial heat storage construction for hot dry rock is realized, economicbenefit of the hot dry rock development is increased, and therefore, the requirement of commercial development is met.

Description

technical field [0001] The invention belongs to the technical field of exploitation of high-temperature geothermal resources, and in particular relates to a construction system and a construction method of a multi-well combined hot dry rock artificial heat storage. Background technique [0002] In recent years, the development and utilization of geothermal resources has developed rapidly, and it has become one of the clean and renewable energy sources that countries around the world focus on developing. According to the existing form, it is mainly divided into two types: hydrothermal type and dry hot rock type. Hot dry rock refers to a high-temperature rock mass buried thousands of meters underground that does not contain water or steam. It is mainly igneous rock with a temperature higher than 180°C. It is characterized by high temperature, hardness and compactness. The development potential of hot dry rock resources is huge. It is estimated that the energy contained in hot...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned background technology. Existing hot dry rock projects at home and abroad generally use single-well hydraulic fracturing and double-well water injection circulation to construct artificial thermal reservoirs. The expansion and extension of cracks during single-well hydraulic fracturing Limited, it is easy to form a single fracture, and the sweeping range is small; when the double well water injection circulation operation is limited by the fracture length and sweeping range of single well fracturing, it is difficult to significantly increase the volume and heat transfer area of ​​the artificial heat storage formed finally. , to provide a multi-well combined hot dry rock artificial heat storage construction system and construction method. The present invention takes the multi-well combined system and method as the core, comprehensively hydraulic fracturing and chemical stimulation and other means to carry out the construction of dry hot rock artificial heat storage, It can effectively increase the length and number of cracks in the rock mass, significantly improve the communication distance between wells in the hot dry rock development, the effective volume of the artificial heat storage and the heat exchange area, and ensure that the hot dry rock artificial heat storage has sufficient production efficiency and service life

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