Method for constructing hot dry rock artificial geothermal reservoir through cooperation of hydraulic fracturing and millisecond millisecond blasting

Abstract

The invention discloses a method for constructing a hot dry rock artificial geothermal reservoir through cooperation of hydraulic fracturing and millisecond millisecond blasting and belongs to the field of construction of a hot dry rock artificial geothermal reservoir of EGS (enhanced geothermal systems). The method comprises steps as follows: firstly, determining the depth and range of a target layer of hot dry rock; constructing a water injection well and a production well to the target layer of hot dry rock; constructing multiple parallel horizontal drilling holes in the target layer to communicate the water injection well and the production well; producing cracks to a certain degree on the periphery of hole walls in group holes with a sectional hydraulic fracturing technology; later, mounting cartridges in the group holes, and the drilling holes are blasted with a millisecond millisecond blasting technology; and finally, injecting a large amount of normal-temperature water into thetarget layer from the water injection well, performing heat exchange sufficiently through the artificial geothermal reservoir, converting solid heat into liquid heat, and exploiting high-temperaturewater and overheating steam from the production well. The hydraulic fracturing and millisecond millisecond blasting technologies are organically combined, the hot dry rock artificial geothermal reservoir can be constructed to the utmost extent, and the application prospects are broad.

Description

technical field [0001] The invention relates to the construction field of hot dry rock artificial heat storage of enhanced geothermal system (EGS), in particular to a method for constructing dry hot rock artificial heat storage in cooperation with group hole hydraulic fracturing and millisecond differential blasting, which is especially suitable for low Deep hot dry rock with porosity and low permeability. Background technique [0002] Hot dry rock refers to a high-temperature rock mass with no fluid or only a small amount of fluid inside, and the temperature is between 150-650°C, and the general burial depth is 3000-10000m. The global geothermal energy resources are about 4900 trillion tons of standard coal, and China accounts for about 1 / 6 of the world's total. In my country, the reserves of hot dry rock geothermal resources are very rich, and the current detection total is about 2×10 25 J, the total amount is 300 times that of my country's total oil, gas and coal resour...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of hydraulic fracturing and millisecond differential blasting for constructing hot dry rock artificial heat storage, which creatively combines hydraulic fracturing technology and ultra-deep hole millisecond differential blasting technology and applies it to In the field of hot dry rock artificial heat storage construction, on the one hand, it can overcome the defect of a single hydraulic fracturing technology to construct artificial heat storage, and on the other hand, it can reduce production costs, expand economic benefits, and meet the needs of commercial development.

Images