Method for artificial building of hot dry rock heat storage layer

Abstract

The invention discloses a method for artificial building of a hot dry rock heat storage layer. Heat storage layer joint forming is conducted through the layered segment blasting joint forming mode. A plurality of cavities with certain widths are formed in a horizontal well segment at equal intervals through a high-pressure pulse jet flow drill tool, liquid explosives are injected into a horizontal well, and then an electromagnetic initiator is put down from an injection well. Then rock powder is backfilled to a production well and the injection well correspondingly, and the well hole sealing effect is achieved. Meanwhile, a microseismic monitoring device is put down from a monitoring well to monitor the blasting joint forming effect. After blasting is implemented, when cracks are sufficiently developed, blasting operation can be implemented again. When artificial crack swarms meet the design requirements, blasting operation can be stopped. According to the method for artificial building of the hot dry rock heat storage layer, the joint forming quality can be improved, the large-size artificial crack swarms are formed, meanwhile large hydraulic fracturing is not needed, increasing of the utilization rate of a hot dry rock layer is facilitated, and conditions are provided for achievement of commercial use of hot dry rocks.

Description

technical field [0001] The invention relates to the field of hot dry rock artificially constructed thermal reservoirs, in particular to a method for artificially constructing dry hot rock thermal reservoirs. Background technique [0002] Hot dry rock resources are widely distributed, rich in reserves, and have considerable mining value. The most important issue in the development of hot dry rock is the construction of thermal reservoirs. From the perspective of hot dry rock projects developed in other countries in the world, artificial thermal The quality of reservoir construction directly affects the commercial value of hot dry rock projects. At present, in the development of hot dry rock, large-scale hydraulic fracturing technology is mainly used for artificial construction of thermal reservoirs. Since hot dry rock resources are mostly located in the deep part of the earth's crust and are often accompanied by high in-situ stress, the pressure requirements for fracturing ar...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that expected cracks cannot be produced when hot dry rocks are developed in the prior art. Since hot dry rock resources are mostly located in the deep part of the earth's crust, they are often accompanied by high in-situ stress, so the pressure on fracturing The requirements are relatively high, and the current equipment cannot provide a high enough fracturing pressure. Moreover, hydraulic fracturing usually cannot extend along the predetermined direction, and there is a problem that the direction of fracture development cannot be well controlled. To provide an artificially constructed hot dry rock Thermal Reservoir Approach

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